app/django/contrib/gis/utils/layermapping.py
author Lennard de Rijk <ljvderijk@gmail.com>
Thu, 30 Jul 2009 10:53:03 +0200
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# LayerMapping -- A Django Model/OGR Layer Mapping Utility
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"""
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 The LayerMapping class provides a way to map the contents of OGR
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 vector files (e.g. SHP files) to Geographic-enabled Django models.
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 This grew out of my personal needs, specifically the code repetition
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 that went into pulling geometries and fields out of an OGR layer,
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 converting to another coordinate system (e.g. WGS84), and then inserting
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 into a GeoDjango model.
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 Please report any bugs encountered using this utility.
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 Requirements:  OGR C Library (from GDAL) required.
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 Usage: 
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  lm = LayerMapping(model, source_file, mapping) where,
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  model:
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   GeoDjango model (not an instance)
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  data:
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   OGR-supported data source file (e.g. a shapefile) or
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    gdal.DataSource instance
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  mapping:
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   A python dictionary, keys are strings corresponding
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   to the GeoDjango model field, and values correspond to
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   string field names for the OGR feature, or if the model field
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   is a geographic then it should correspond to the OGR
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   geometry type, e.g. 'POINT', 'LINESTRING', 'POLYGON'.
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 Keyword Args:
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  layer:
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   The index of the layer to use from the Data Source (defaults to 0)
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  source_srs:
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   Use this to specify the source SRS manually (for example, 
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   some shapefiles don't come with a '.prj' file).  An integer SRID,
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   a string WKT, and SpatialReference objects are valid parameters.
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  encoding:
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   Specifies the encoding of the string in the OGR data source.
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   For example, 'latin-1', 'utf-8', and 'cp437' are all valid
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   encoding parameters.
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  transaction_mode:
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   May be 'commit_on_success' (default) or 'autocommit'.
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  transform:
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   Setting this to False will disable all coordinate transformations.  
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  unique:
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   Setting this to the name, or a tuple of names, from the given
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   model will create models unique only to the given name(s).
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   Geometries will from each feature will be added into the collection
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   associated with the unique model.  Forces transaction mode to
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   be 'autocommit'.
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Example:
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 1. You need a GDAL-supported data source, like a shapefile.
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  Assume we're using the test_poly SHP file:
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  >>> from django.contrib.gis.gdal import DataSource
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  >>> ds = DataSource('test_poly.shp')
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  >>> layer = ds[0]
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  >>> print layer.fields # Exploring the fields in the layer, we only want the 'str' field.
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  ['float', 'int', 'str']
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  >>> print len(layer) # getting the number of features in the layer (should be 3)
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  3
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  >>> print layer.geom_type # Should be 3 (a Polygon)
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  3
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  >>> print layer.srs # WGS84
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  GEOGCS["GCS_WGS_1984",
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      DATUM["WGS_1984",
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          SPHEROID["WGS_1984",6378137,298.257223563]],
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      PRIMEM["Greenwich",0],
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      UNIT["Degree",0.017453292519943295]]
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 2. Now we define our corresponding Django model (make sure to use syncdb):
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  from django.contrib.gis.db import models
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  class TestGeo(models.Model, models.GeoMixin):
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      name = models.CharField(maxlength=25) # corresponds to the 'str' field
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      poly = models.PolygonField(srid=4269) # we want our model in a different SRID
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      objects = models.GeoManager()
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      def __str__(self):
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          return 'Name: %s' % self.name
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 3. Use LayerMapping to extract all the features and place them in the database:
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  >>> from django.contrib.gis.utils import LayerMapping
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  >>> from geoapp.models import TestGeo
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  >>> mapping = {'name' : 'str', # The 'name' model field maps to the 'str' layer field.
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                 'poly' : 'POLYGON', # For geometry fields use OGC name.
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                 } # The mapping is a dictionary
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  >>> lm = LayerMapping(TestGeo, 'test_poly.shp', mapping) 
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  >>> lm.save(verbose=True) # Save the layermap, imports the data. 
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  Saved: Name: 1
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  Saved: Name: 2
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  Saved: Name: 3
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 LayerMapping just transformed the three geometries from the SHP file from their
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 source spatial reference system (WGS84) to the spatial reference system of
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 the GeoDjango model (NAD83).  If no spatial reference system is defined for
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 the layer, use the `source_srs` keyword with a SpatialReference object to
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 specify one.
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"""
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import sys
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from datetime import date, datetime
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from decimal import Decimal
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from django.core.exceptions import ObjectDoesNotExist
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from django.contrib.gis.db.models import GeometryField
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from django.contrib.gis.db.backend import SpatialBackend
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from django.contrib.gis.gdal import CoordTransform, DataSource, \
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    OGRException, OGRGeometry, OGRGeomType, SpatialReference
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from django.contrib.gis.gdal.field import \
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    OFTDate, OFTDateTime, OFTInteger, OFTReal, OFTString, OFTTime
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from django.contrib.gis.models import GeometryColumns, SpatialRefSys
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from django.db import models, transaction
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from django.contrib.localflavor.us.models import USStateField
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# LayerMapping exceptions.
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class LayerMapError(Exception): pass
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class InvalidString(LayerMapError): pass
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class InvalidDecimal(LayerMapError): pass
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class InvalidInteger(LayerMapError): pass
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class MissingForeignKey(LayerMapError): pass
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class LayerMapping(object):
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    "A class that maps OGR Layers to GeoDjango Models."
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    # Acceptable 'base' types for a multi-geometry type.
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    MULTI_TYPES = {1 : OGRGeomType('MultiPoint'),
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                   2 : OGRGeomType('MultiLineString'),
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                   3 : OGRGeomType('MultiPolygon'),
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                   }
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    # Acceptable Django field types and corresponding acceptable OGR
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    # counterparts.
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    FIELD_TYPES = {
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        models.AutoField : OFTInteger,
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        models.IntegerField : (OFTInteger, OFTReal, OFTString),
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        models.FloatField : (OFTInteger, OFTReal),
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        models.DateField : OFTDate,
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        models.DateTimeField : OFTDateTime,
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        models.EmailField : OFTString,
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        models.TimeField : OFTTime,
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        models.DecimalField : (OFTInteger, OFTReal),
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        models.CharField : OFTString,
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        models.SlugField : OFTString,
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        models.TextField : OFTString,
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        models.URLField : OFTString,
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        USStateField : OFTString,
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        models.XMLField : OFTString,
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        models.SmallIntegerField : (OFTInteger, OFTReal, OFTString),
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        models.PositiveSmallIntegerField : (OFTInteger, OFTReal, OFTString),
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        }
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    # The acceptable transaction modes.
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    TRANSACTION_MODES = {'autocommit' : transaction.autocommit,
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                         'commit_on_success' : transaction.commit_on_success,
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                         }
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    def __init__(self, model, data, mapping, layer=0, 
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                 source_srs=None, encoding=None,
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                 transaction_mode='commit_on_success', 
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                 transform=True, unique=None):
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        """
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        A LayerMapping object is initialized using the given Model (not an instance),
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        a DataSource (or string path to an OGR-supported data file), and a mapping
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        dictionary.  See the module level docstring for more details and keyword
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        argument usage.
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        """
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        # Getting the DataSource and the associated Layer.
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        if isinstance(data, basestring):
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            self.ds = DataSource(data)
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        else:
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            self.ds = data
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        self.layer = self.ds[layer]
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        # Setting the mapping & model attributes.
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        self.mapping = mapping
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        self.model = model
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        # Checking the layer -- intitialization of the object will fail if
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        # things don't check out before hand.
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        self.check_layer()
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        # Getting the geometry column associated with the model (an 
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        # exception will be raised if there is no geometry column).
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        self.geo_col = self.geometry_column()
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        # Checking the source spatial reference system, and getting
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        # the coordinate transformation object (unless the `transform`
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        # keyword is set to False)
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        if transform:
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            self.source_srs = self.check_srs(source_srs)
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            self.transform = self.coord_transform()
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        else:
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            self.transform = transform
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        # Setting the encoding for OFTString fields, if specified.
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        if encoding:
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            # Making sure the encoding exists, if not a LookupError
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            # exception will be thrown.
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            from codecs import lookup
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            lookup(encoding)
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            self.encoding = encoding
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        else:
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            self.encoding = None
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        if unique:
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            self.check_unique(unique)
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            transaction_mode = 'autocommit' # Has to be set to autocommit.
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            self.unique = unique
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        else:
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            self.unique = None
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        # Setting the transaction decorator with the function in the 
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        # transaction modes dictionary.
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        if transaction_mode in self.TRANSACTION_MODES:
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            self.transaction_decorator = self.TRANSACTION_MODES[transaction_mode]
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            self.transaction_mode = transaction_mode
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        else:
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            raise LayerMapError('Unrecognized transaction mode: %s' % transaction_mode)
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    #### Checking routines used during initialization ####
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    def check_fid_range(self, fid_range):
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        "This checks the `fid_range` keyword."
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        if fid_range:
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            if isinstance(fid_range, (tuple, list)):
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                return slice(*fid_range)
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            elif isinstance(fid_range, slice):
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                return fid_range
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            else:
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                raise TypeError
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        else:
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            return None
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    def check_layer(self):
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diff changeset
   242
        """
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parents:
diff changeset
   243
        This checks the Layer metadata, and ensures that it is compatible
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parents:
diff changeset
   244
        with the mapping information and model.  Unlike previous revisions,
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parents:
diff changeset
   245
        there is no need to increment through each feature in the Layer.
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parents:
diff changeset
   246
        """
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   247
        # The geometry field of the model is set here.
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parents:
diff changeset
   248
        # TODO: Support more than one geometry field / model.  However, this
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parents:
diff changeset
   249
        # depends on the GDAL Driver in use.
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parents:
diff changeset
   250
        self.geom_field = False
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parents:
diff changeset
   251
        self.fields = {}
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parents:
diff changeset
   252
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   253
        # Getting lists of the field names and the field types available in
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parents:
diff changeset
   254
        # the OGR Layer.
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parents:
diff changeset
   255
        ogr_fields = self.layer.fields
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parents:
diff changeset
   256
        ogr_field_types = self.layer.field_types
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parents:
diff changeset
   257
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   258
        # Function for determining if the OGR mapping field is in the Layer.
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parents:
diff changeset
   259
        def check_ogr_fld(ogr_map_fld):
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parents:
diff changeset
   260
            try:
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diff changeset
   261
                idx = ogr_fields.index(ogr_map_fld)
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parents:
diff changeset
   262
            except ValueError:
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parents:
diff changeset
   263
                raise LayerMapError('Given mapping OGR field "%s" not found in OGR Layer.' % ogr_map_fld)
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parents:
diff changeset
   264
            return idx
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   265
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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diff changeset
   266
        # No need to increment through each feature in the model, simply check
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parents:
diff changeset
   267
        # the Layer metadata against what was given in the mapping dictionary.
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parents:
diff changeset
   268
        for field_name, ogr_name in self.mapping.items():
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parents:
diff changeset
   269
            # Ensuring that a corresponding field exists in the model
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parents:
diff changeset
   270
            # for the given field name in the mapping.
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parents:
diff changeset
   271
            try:
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diff changeset
   272
                model_field = self.model._meta.get_field(field_name)
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diff changeset
   273
            except models.fields.FieldDoesNotExist:
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diff changeset
   274
                raise LayerMapError('Given mapping field "%s" not in given Model fields.' % field_name)
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parents:
diff changeset
   275
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   276
            # Getting the string name for the Django field class (e.g., 'PointField').
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parents:
diff changeset
   277
            fld_name = model_field.__class__.__name__
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parents:
diff changeset
   278
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   279
            if isinstance(model_field, GeometryField):
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parents:
diff changeset
   280
                if self.geom_field:
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diff changeset
   281
                    raise LayerMapError('LayerMapping does not support more than one GeometryField per model.')
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parents:
diff changeset
   282
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   283
                try:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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diff changeset
   284
                    gtype = OGRGeomType(ogr_name)
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parents:
diff changeset
   285
                except OGRException:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   286
                    raise LayerMapError('Invalid mapping for GeometryField "%s".' % field_name)
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parents:
diff changeset
   287
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   288
                # Making sure that the OGR Layer's Geometry is compatible.
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parents:
diff changeset
   289
                ltype = self.layer.geom_type
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parents:
diff changeset
   290
                if not (gtype == ltype or self.make_multi(ltype, model_field)):
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parents:
diff changeset
   291
                    raise LayerMapError('Invalid mapping geometry; model has %s, feature has %s.' % (fld_name, gtype))
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parents:
diff changeset
   292
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   293
                # Setting the `geom_field` attribute w/the name of the model field
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   294
                # that is a Geometry.
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parents:
diff changeset
   295
                self.geom_field = field_name
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   296
                fields_val = model_field
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parents:
diff changeset
   297
            elif isinstance(model_field, models.ForeignKey):
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   298
                if isinstance(ogr_name, dict):
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   299
                    # Is every given related model mapping field in the Layer?
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   300
                    rel_model = model_field.rel.to
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   301
                    for rel_name, ogr_field in ogr_name.items(): 
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parents:
diff changeset
   302
                        idx = check_ogr_fld(ogr_field)
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   303
                        try:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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diff changeset
   304
                            rel_field = rel_model._meta.get_field(rel_name)
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parents:
diff changeset
   305
                        except models.fields.FieldDoesNotExist:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   306
                            raise LayerMapError('ForeignKey mapping field "%s" not in %s fields.' % 
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   307
                                                (rel_name, rel_model.__class__.__name__))
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   308
                    fields_val = rel_model
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   309
                else:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   310
                    raise TypeError('ForeignKey mapping must be of dictionary type.')
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   311
            else:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   312
                # Is the model field type supported by LayerMapping?
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   313
                if not model_field.__class__ in self.FIELD_TYPES:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   314
                    raise LayerMapError('Django field type "%s" has no OGR mapping (yet).' % fld_name)
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   315
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   316
                # Is the OGR field in the Layer?
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   317
                idx = check_ogr_fld(ogr_name)
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   318
                ogr_field = ogr_field_types[idx]
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   319
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   320
                # Can the OGR field type be mapped to the Django field type?
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   321
                if not issubclass(ogr_field, self.FIELD_TYPES[model_field.__class__]):
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   322
                    raise LayerMapError('OGR field "%s" (of type %s) cannot be mapped to Django %s.' % 
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   323
                                        (ogr_field, ogr_field.__name__, fld_name))
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   324
                fields_val = model_field
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   325
        
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   326
            self.fields[field_name] = fields_val
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   327
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   328
    def check_srs(self, source_srs):
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   329
        "Checks the compatibility of the given spatial reference object."
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   330
        if isinstance(source_srs, SpatialReference):
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   331
            sr = source_srs
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   332
        elif isinstance(source_srs, SpatialRefSys):
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   333
            sr = source_srs.srs
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   334
        elif isinstance(source_srs, (int, basestring)):
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   335
            sr = SpatialReference(source_srs)
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   336
        else:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   337
            # Otherwise just pulling the SpatialReference from the layer
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   338
            sr = self.layer.srs
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   339
        
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   340
        if not sr:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   341
            raise LayerMapError('No source reference system defined.')
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   342
        else:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   343
            return sr
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   344
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   345
    def check_unique(self, unique):
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   346
        "Checks the `unique` keyword parameter -- may be a sequence or string."
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   347
        if isinstance(unique, (list, tuple)):
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   348
            # List of fields to determine uniqueness with
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   349
            for attr in unique: 
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   350
                if not attr in self.mapping: raise ValueError
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   351
        elif isinstance(unique, basestring):
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   352
            # Only a single field passed in.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   353
            if unique not in self.mapping: raise ValueError
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   354
        else:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   355
            raise TypeError('Unique keyword argument must be set with a tuple, list, or string.')
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   356
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   357
    #### Keyword argument retrieval routines ####
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   358
    def feature_kwargs(self, feat):
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   359
        """
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
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parents:
diff changeset
   360
        Given an OGR Feature, this will return a dictionary of keyword arguments
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   361
        for constructing the mapped model.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   362
        """
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   363
        # The keyword arguments for model construction.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   364
        kwargs = {}
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   365
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   366
        # Incrementing through each model field and OGR field in the
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   367
        # dictionary mapping.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   368
        for field_name, ogr_name in self.mapping.items():
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   369
            model_field = self.fields[field_name]
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   370
            
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   371
            if isinstance(model_field, GeometryField):
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   372
                # Verify OGR geometry.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   373
                val = self.verify_geom(feat.geom, model_field)
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   374
            elif isinstance(model_field, models.base.ModelBase):
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   375
                # The related _model_, not a field was passed in -- indicating
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   376
                # another mapping for the related Model.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   377
                val = self.verify_fk(feat, model_field, ogr_name)
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   378
            else:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   379
                # Otherwise, verify OGR Field type.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   380
                val = self.verify_ogr_field(feat[ogr_name], model_field)
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   381
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   382
            # Setting the keyword arguments for the field name with the
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   383
            # value obtained above.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   384
            kwargs[field_name] = val
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   385
            
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   386
        return kwargs
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   387
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   388
    def unique_kwargs(self, kwargs):
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   389
        """
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   390
        Given the feature keyword arguments (from `feature_kwargs`) this routine
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   391
        will construct and return the uniqueness keyword arguments -- a subset
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   392
        of the feature kwargs.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   393
        """
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   394
        if isinstance(self.unique, basestring):
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   395
            return {self.unique : kwargs[self.unique]}
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   396
        else:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   397
            return dict((fld, kwargs[fld]) for fld in self.unique)
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   398
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   399
    #### Verification routines used in constructing model keyword arguments. ####
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   400
    def verify_ogr_field(self, ogr_field, model_field):
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   401
        """
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   402
        Verifies if the OGR Field contents are acceptable to the Django
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   403
        model field.  If they are, the verified value is returned, 
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   404
        otherwise the proper exception is raised.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   405
        """
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   406
        if (isinstance(ogr_field, OFTString) and 
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   407
            isinstance(model_field, (models.CharField, models.TextField))): 
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   408
            if self.encoding:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   409
                # The encoding for OGR data sources may be specified here
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   410
                # (e.g., 'cp437' for Census Bureau boundary files).
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   411
                val = unicode(ogr_field.value, self.encoding)
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   412
            else:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   413
                val = ogr_field.value
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   414
                if len(val) > model_field.max_length:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   415
                    raise InvalidString('%s model field maximum string length is %s, given %s characters.' %
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   416
                                        (model_field.name, model_field.max_length, len(val)))
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   417
        elif isinstance(ogr_field, OFTReal) and isinstance(model_field, models.DecimalField):
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   418
            try:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   419
                # Creating an instance of the Decimal value to use.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   420
                d = Decimal(str(ogr_field.value))
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   421
            except:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   422
                raise InvalidDecimal('Could not construct decimal from: %s' % ogr_field.value)
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   423
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   424
            # Getting the decimal value as a tuple.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   425
            dtup = d.as_tuple()
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   426
            digits = dtup[1]
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   427
            d_idx = dtup[2] # index where the decimal is
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   428
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   429
            # Maximum amount of precision, or digits to the left of the decimal.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   430
            max_prec = model_field.max_digits - model_field.decimal_places
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   431
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   432
            # Getting the digits to the left of the decimal place for the 
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   433
            # given decimal.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   434
            if d_idx < 0:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   435
                n_prec = len(digits[:d_idx])
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   436
            else:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   437
                n_prec = len(digits) + d_idx
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   438
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   439
            # If we have more than the maximum digits allowed, then throw an 
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   440
            # InvalidDecimal exception.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   441
            if n_prec > max_prec:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   442
                raise InvalidDecimal('A DecimalField with max_digits %d, decimal_places %d must round to an absolute value less than 10^%d.' %
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   443
                                     (model_field.max_digits, model_field.decimal_places, max_prec))
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   444
            val = d
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   445
        elif isinstance(ogr_field, (OFTReal, OFTString)) and isinstance(model_field, models.IntegerField):
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   446
            # Attempt to convert any OFTReal and OFTString value to an OFTInteger.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   447
            try:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   448
                val = int(ogr_field.value)
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   449
            except:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   450
                raise InvalidInteger('Could not construct integer from: %s' % ogr_field.value)
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   451
        else:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   452
            val = ogr_field.value
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   453
        return val
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   454
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   455
    def verify_fk(self, feat, rel_model, rel_mapping):
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   456
        """
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   457
        Given an OGR Feature, the related model and its dictionary mapping,
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   458
        this routine will retrieve the related model for the ForeignKey
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   459
        mapping.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   460
        """
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   461
        # TODO: It is expensive to retrieve a model for every record --
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   462
        #  explore if an efficient mechanism exists for caching related 
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   463
        #  ForeignKey models.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   464
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   465
        # Constructing and verifying the related model keyword arguments.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   466
        fk_kwargs = {}
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   467
        for field_name, ogr_name in rel_mapping.items():
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   468
            fk_kwargs[field_name] = self.verify_ogr_field(feat[ogr_name], rel_model._meta.get_field(field_name))
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   469
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   470
        # Attempting to retrieve and return the related model.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   471
        try:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   472
            return rel_model.objects.get(**fk_kwargs)
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   473
        except ObjectDoesNotExist:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   474
            raise MissingForeignKey('No ForeignKey %s model found with keyword arguments: %s' % (rel_model.__name__, fk_kwargs))
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   475
            
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   476
    def verify_geom(self, geom, model_field):
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   477
        """
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   478
        Verifies the geometry -- will construct and return a GeometryCollection
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   479
        if necessary (for example if the model field is MultiPolygonField while
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   480
        the mapped shapefile only contains Polygons).
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   481
        """
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   482
        if self.make_multi(geom.geom_type, model_field):
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   483
            # Constructing a multi-geometry type to contain the single geometry
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   484
            multi_type = self.MULTI_TYPES[geom.geom_type.num]
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   485
            g = OGRGeometry(multi_type)
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   486
            g.add(geom)
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   487
        else:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   488
            g = geom
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   489
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   490
        # Transforming the geometry with our Coordinate Transformation object,
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   491
        # but only if the class variable `transform` is set w/a CoordTransform 
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   492
        # object.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   493
        if self.transform: g.transform(self.transform)
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   494
        
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   495
        # Returning the WKT of the geometry.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   496
        return g.wkt
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   497
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   498
    #### Other model methods ####
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   499
    def coord_transform(self):
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   500
        "Returns the coordinate transformation object."
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   501
        try:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   502
            # Getting the target spatial reference system
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   503
            target_srs = SpatialRefSys.objects.get(srid=self.geo_col.srid).srs
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   504
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   505
            # Creating the CoordTransform object
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   506
            return CoordTransform(self.source_srs, target_srs)
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   507
        except Exception, msg:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   508
            raise LayerMapError('Could not translate between the data source and model geometry: %s' % msg)
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   509
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   510
    def geometry_column(self):
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   511
        "Returns the GeometryColumn model associated with the geographic column."
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   512
        # Getting the GeometryColumn object.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   513
        try:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   514
            db_table = self.model._meta.db_table
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   515
            geo_col = self.geom_field
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   516
            if SpatialBackend.name == 'oracle':
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   517
                # Making upper case for Oracle.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   518
                db_table = db_table.upper()
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   519
                geo_col = geo_col.upper()
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   520
            gc_kwargs = {GeometryColumns.table_name_col() : db_table,
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   521
                         GeometryColumns.geom_col_name() : geo_col,
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   522
                         }
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   523
            return GeometryColumns.objects.get(**gc_kwargs)
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   524
        except Exception, msg:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   525
            raise LayerMapError('Geometry column does not exist for model. (did you run syncdb?):\n %s' % msg)
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   526
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   527
    def make_multi(self, geom_type, model_field):
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   528
        """
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   529
        Given the OGRGeomType for a geometry and its associated GeometryField, 
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   530
        determine whether the geometry should be turned into a GeometryCollection.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   531
        """
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   532
        return (geom_type.num in self.MULTI_TYPES and 
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   533
                model_field.__class__.__name__ == 'Multi%s' % geom_type.django)
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   534
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   535
    def save(self, verbose=False, fid_range=False, step=False, 
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   536
             progress=False, silent=False, stream=sys.stdout, strict=False):
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   537
        """
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   538
        Saves the contents from the OGR DataSource Layer into the database
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   539
        according to the mapping dictionary given at initialization. 
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   540
        
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   541
        Keyword Parameters:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   542
         verbose:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   543
           If set, information will be printed subsequent to each model save 
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   544
           executed on the database.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   545
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   546
         fid_range:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   547
           May be set with a slice or tuple of (begin, end) feature ID's to map
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   548
           from the data source.  In other words, this keyword enables the user
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   549
           to selectively import a subset range of features in the geographic
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   550
           data source.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   551
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   552
         step:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   553
           If set with an integer, transactions will occur at every step 
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   554
           interval. For example, if step=1000, a commit would occur after 
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   555
           the 1,000th feature, the 2,000th feature etc.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   556
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   557
         progress:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   558
           When this keyword is set, status information will be printed giving 
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   559
           the number of features processed and sucessfully saved.  By default, 
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   560
           progress information will pe printed every 1000 features processed, 
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   561
           however, this default may be overridden by setting this keyword with an 
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   562
           integer for the desired interval.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   563
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   564
         stream:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   565
           Status information will be written to this file handle.  Defaults to 
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   566
           using `sys.stdout`, but any object with a `write` method is supported.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   567
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   568
         silent:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   569
           By default, non-fatal error notifications are printed to stdout, but 
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   570
           this keyword may be set to disable these notifications.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   571
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   572
         strict:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   573
           Execution of the model mapping will cease upon the first error 
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   574
           encountered.  The default behavior is to attempt to continue.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   575
        """
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   576
        # Getting the default Feature ID range.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   577
        default_range = self.check_fid_range(fid_range)
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   578
    
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   579
        # Setting the progress interval, if requested.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   580
        if progress:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   581
            if progress is True or not isinstance(progress, int):
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   582
                progress_interval = 1000
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   583
            else:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   584
                progress_interval = progress
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   585
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   586
        # Defining the 'real' save method, utilizing the transaction 
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   587
        # decorator created during initialization.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   588
        @self.transaction_decorator
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   589
        def _save(feat_range=default_range, num_feat=0, num_saved=0):
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   590
            if feat_range:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   591
                layer_iter = self.layer[feat_range]
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   592
            else:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   593
                layer_iter = self.layer
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   594
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   595
            for feat in layer_iter:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   596
                num_feat += 1
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   597
                # Getting the keyword arguments
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   598
                try:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   599
                    kwargs = self.feature_kwargs(feat)
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   600
                except LayerMapError, msg:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   601
                    # Something borked the validation
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   602
                    if strict: raise
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   603
                    elif not silent: 
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   604
                        stream.write('Ignoring Feature ID %s because: %s\n' % (feat.fid, msg))
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   605
                else:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   606
                    # Constructing the model using the keyword args
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   607
                    is_update = False
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   608
                    if self.unique:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   609
                        # If we want unique models on a particular field, handle the
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   610
                        # geometry appropriately.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   611
                        try:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   612
                            # Getting the keyword arguments and retrieving
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   613
                            # the unique model.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   614
                            u_kwargs = self.unique_kwargs(kwargs)
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   615
                            m = self.model.objects.get(**u_kwargs)
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   616
                            is_update = True
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   617
                                
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   618
                            # Getting the geometry (in OGR form), creating 
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   619
                            # one from the kwargs WKT, adding in additional 
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   620
                            # geometries, and update the attribute with the 
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   621
                            # just-updated geometry WKT.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   622
                            geom = getattr(m, self.geom_field).ogr
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   623
                            new = OGRGeometry(kwargs[self.geom_field])
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   624
                            for g in new: geom.add(g) 
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   625
                            setattr(m, self.geom_field, geom.wkt)
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   626
                        except ObjectDoesNotExist:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   627
                            # No unique model exists yet, create.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   628
                            m = self.model(**kwargs)
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   629
                    else:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   630
                        m = self.model(**kwargs)
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   631
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   632
                    try:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   633
                        # Attempting to save.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   634
                        m.save()
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   635
                        num_saved += 1
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   636
                        if verbose: stream.write('%s: %s\n' % (is_update and 'Updated' or 'Saved', m))
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   637
                    except SystemExit:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   638
                        raise
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   639
                    except Exception, msg:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   640
                        if self.transaction_mode == 'autocommit':
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   641
                            # Rolling back the transaction so that other model saves
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   642
                            # will work.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   643
                            transaction.rollback_unless_managed()
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   644
                        if strict: 
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   645
                            # Bailing out if the `strict` keyword is set.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   646
                            if not silent:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   647
                                stream.write('Failed to save the feature (id: %s) into the model with the keyword arguments:\n' % feat.fid)
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   648
                                stream.write('%s\n' % kwargs)
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   649
                            raise
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   650
                        elif not silent:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   651
                            stream.write('Failed to save %s:\n %s\nContinuing\n' % (kwargs, msg))
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   652
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   653
                # Printing progress information, if requested.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   654
                if progress and num_feat % progress_interval == 0:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   655
                    stream.write('Processed %d features, saved %d ...\n' % (num_feat, num_saved))
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   656
        
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   657
            # Only used for status output purposes -- incremental saving uses the
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   658
            # values returned here.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   659
            return num_saved, num_feat
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   660
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   661
        nfeat = self.layer.num_feat
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   662
        if step and isinstance(step, int) and step < nfeat:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   663
            # Incremental saving is requested at the given interval (step) 
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   664
            if default_range: 
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   665
                raise LayerMapError('The `step` keyword may not be used in conjunction with the `fid_range` keyword.')
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   666
            beg, num_feat, num_saved = (0, 0, 0)
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   667
            indices = range(step, nfeat, step)
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   668
            n_i = len(indices)
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   669
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   670
            for i, end in enumerate(indices):
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   671
                # Constructing the slice to use for this step; the last slice is
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   672
                # special (e.g, [100:] instead of [90:100]).
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   673
                if i+1 == n_i: step_slice = slice(beg, None)
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   674
                else: step_slice = slice(beg, end)
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   675
            
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   676
                try:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   677
                    num_feat, num_saved = _save(step_slice, num_feat, num_saved)
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   678
                    beg = end
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   679
                except:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   680
                    stream.write('%s\nFailed to save slice: %s\n' % ('=-' * 20, step_slice))
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   681
                    raise
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   682
        else:
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   683
            # Otherwise, just calling the previously defined _save() function.
ff1a9aa48cfd Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   684
            _save()