Introduce dynamic scope_path regexps
Instead of relying on scope_path's being "one slash deep", we should
instead allow for either:
1. scope_paths that have a pre-defined depth
2. scope_paths that can be arbitrarily deep
We achieve 1 by setting an entities scope_logic to another logic
module. We then recursively call getScopeDepth until we get to the
topmost entity (that is, an unscoped entity).
A little different is the solution to 2, since some entities can have
an arbitrarily deep scope (such as Documents), we need to have some
way of signaling this to getScopePattern. A clean solution is to
return None, rather than a number. If None is returned, the
SCOPE_PATH_ARG_PATTERN is returned as regexp instead, which will
match an arbitrarily deeply nested scope.
The solution for 2 requires that we return None somewhere in the
scope_logic chain, the most straight forward method to do so is to
override getScopeDepth anywhere such a scope is needed and make it
return None. A more elegant solution however, is to set the
scope_logic to that module in all entities that require it.
Patch by: Sverre Rabbelier
"""
The GeometryColumns and SpatialRefSys models for the Oracle spatial
backend.
It should be noted that Oracle Spatial does not have database tables
named according to the OGC standard, so the closest analogs are used.
For example, the `USER_SDO_GEOM_METADATA` is used for the GeometryColumns
model and the `SDO_COORD_REF_SYS` is used for the SpatialRefSys model.
"""
from django.db import models
from django.contrib.gis.models import SpatialRefSysMixin
class GeometryColumns(models.Model):
"Maps to the Oracle USER_SDO_GEOM_METADATA table."
table_name = models.CharField(max_length=32)
column_name = models.CharField(max_length=1024)
srid = models.IntegerField(primary_key=True)
# TODO: Add support for `diminfo` column (type MDSYS.SDO_DIM_ARRAY).
class Meta:
db_table = 'USER_SDO_GEOM_METADATA'
@classmethod
def table_name_col(cls):
"""
Returns the name of the metadata column used to store the
the feature table name.
"""
return 'table_name'
@classmethod
def geom_col_name(cls):
"""
Returns the name of the metadata column used to store the
the feature geometry column.
"""
return 'column_name'
def __unicode__(self):
return '%s - %s (SRID: %s)' % (self.table_name, self.column_name, self.srid)
class SpatialRefSys(models.Model, SpatialRefSysMixin):
"Maps to the Oracle MDSYS.CS_SRS table."
cs_name = models.CharField(max_length=68)
srid = models.IntegerField(primary_key=True)
auth_srid = models.IntegerField()
auth_name = models.CharField(max_length=256)
wktext = models.CharField(max_length=2046)
#cs_bounds = models.GeometryField()
class Meta:
# TODO: Figure out way to have this be MDSYS.CS_SRS without
# having django's quoting mess up the SQL.
db_table = 'CS_SRS'
@property
def wkt(self):
return self.wktext
@classmethod
def wkt_col(cls):
return 'wktext'