app/django/contrib/gis/sitemaps/kml.py
author Lennard de Rijk <ljvderijk@gmail.com>
Fri, 03 Jul 2009 15:00:00 +0200
changeset 2506 c98bf890156e
parent 323 ff1a9aa48cfd
permissions -rw-r--r--
Removed getSurveyResponseFromPost from Surveys helper. We will use the power of Django Forms instead of getting our own properties. This fits better into the rest of Melange which also uses this approach.

from django.core import urlresolvers
from django.contrib.sitemaps import Sitemap
from django.contrib.gis.db.models.fields import GeometryField
from django.db import models

class KMLSitemap(Sitemap):
    """
    A minimal hook to produce KML sitemaps.
    """
    geo_format = 'kml'

    def __init__(self, locations=None):
        # If no locations specified, then we try to build for
        # every model in installed applications.
        self.locations = self._build_kml_sources(locations)
        
    def _build_kml_sources(self, sources):
        """
        Goes through the given sources and returns a 3-tuple of
        the application label, module name, and field name of every
        GeometryField encountered in the sources.

        If no sources are provided, then all models.
        """
        kml_sources = []
        if sources is None:
            sources = models.get_models()
        for source in sources:
            if isinstance(source, models.base.ModelBase):
                for field in source._meta.fields:
                    if isinstance(field, GeometryField):
                        kml_sources.append((source._meta.app_label,
                                            source._meta.module_name,
                                            field.name))
            elif isinstance(source, (list, tuple)):
                if len(source) != 3: 
                    raise ValueError('Must specify a 3-tuple of (app_label, module_name, field_name).')
                kml_sources.append(source)
            else:
                raise TypeError('KML Sources must be a model or a 3-tuple.')
        return kml_sources

    def get_urls(self, page=1):
        """
        This method is overrridden so the appropriate `geo_format` attribute
        is placed on each URL element.
        """
        urls = Sitemap.get_urls(self, page=page)
        for url in urls: url['geo_format'] = self.geo_format
        return urls

    def items(self):
        return self.locations

    def location(self, obj):
        return urlresolvers.reverse('django.contrib.gis.sitemaps.views.%s' % self.geo_format,
                                    kwargs={'label' : obj[0], 
                                            'model' : obj[1],
                                            'field_name': obj[2],
                                            }
                                    )
class KMZSitemap(KMLSitemap):
    geo_format = 'kmz'