--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/app/django/contrib/gis/db/backend/oracle/field.py	Tue Oct 14 16:00:59 2008 +0000
@@ -0,0 +1,103 @@
+from django.db import connection
+from django.db.backends.util import truncate_name
+from django.db.models.fields import Field # Django base Field class
+from django.contrib.gis.db.backend.util import gqn
+from django.contrib.gis.db.backend.oracle.query import TRANSFORM
+
+# Quotename & geographic quotename, respectively.
+qn = connection.ops.quote_name
+
+class OracleSpatialField(Field):
+    """
+    The backend-specific geographic field for Oracle Spatial.
+    """
+
+    empty_strings_allowed = False
+
+    def __init__(self, extent=(-180.0, -90.0, 180.0, 90.0), tolerance=0.05, **kwargs):
+        """
+        Oracle Spatial backend needs to have the extent -- for projected coordinate
+        systems _you must define the extent manually_, since the coordinates are
+        for geodetic systems.  The `tolerance` keyword specifies the tolerance
+        for error (in meters), and defaults to 0.05 (5 centimeters).
+        """
+        # Oracle Spatial specific keyword arguments.
+        self._extent = extent
+        self._tolerance = tolerance
+        # Calling the Django field initialization.
+        super(OracleSpatialField, self).__init__(**kwargs)
+
+    def _add_geom(self, style, db_table):
+        """
+        Adds this geometry column into the Oracle USER_SDO_GEOM_METADATA
+        table.
+        """
+
+        # Checking the dimensions.
+        # TODO: Add support for 3D geometries.
+        if self._dim != 2:
+            raise Exception('3D geometries not yet supported on Oracle Spatial backend.')
+
+        # Constructing the SQL that will be used to insert information about
+        # the geometry column into the USER_GSDO_GEOM_METADATA table.
+        meta_sql = style.SQL_KEYWORD('INSERT INTO ') + \
+                   style.SQL_TABLE('USER_SDO_GEOM_METADATA') + \
+                   ' (%s, %s, %s, %s)\n  ' % tuple(map(qn, ['TABLE_NAME', 'COLUMN_NAME', 'DIMINFO', 'SRID'])) + \
+                   style.SQL_KEYWORD(' VALUES ') + '(\n    ' + \
+                   style.SQL_TABLE(gqn(db_table)) + ',\n    ' + \
+                   style.SQL_FIELD(gqn(self.column)) + ',\n    ' + \
+                   style.SQL_KEYWORD("MDSYS.SDO_DIM_ARRAY") + '(\n      ' + \
+                   style.SQL_KEYWORD("MDSYS.SDO_DIM_ELEMENT") + \
+                   ("('LONG', %s, %s, %s),\n      " % (self._extent[0], self._extent[2], self._tolerance)) + \
+                   style.SQL_KEYWORD("MDSYS.SDO_DIM_ELEMENT") + \
+                   ("('LAT', %s, %s, %s)\n    ),\n" % (self._extent[1], self._extent[3], self._tolerance)) + \
+                   '    %s\n  );' % self._srid
+        return meta_sql
+
+    def _geom_index(self, style, db_table):
+        "Creates an Oracle Geometry index (R-tree) for this geometry field."
+
+        # Getting the index name, Oracle doesn't allow object
+        # names > 30 characters.
+        idx_name = truncate_name('%s_%s_id' % (db_table, self.column), 30)
+        
+        sql = style.SQL_KEYWORD('CREATE INDEX ') + \
+              style.SQL_TABLE(qn(idx_name)) + \
+              style.SQL_KEYWORD(' ON ') + \
+              style.SQL_TABLE(qn(db_table)) + '(' + \
+              style.SQL_FIELD(qn(self.column)) + ') ' + \
+              style.SQL_KEYWORD('INDEXTYPE IS ') + \
+              style.SQL_TABLE('MDSYS.SPATIAL_INDEX') + ';'
+        return sql
+
+    def post_create_sql(self, style, db_table):
+        """
+        Returns SQL that will be executed after the model has been
+        created.
+        """
+        # Getting the meta geometry information.
+        post_sql = self._add_geom(style, db_table)
+
+        # Getting the geometric index for this Geometry column.
+        if self._index:
+            return (post_sql, self._geom_index(style, db_table))
+        else:
+            return (post_sql,)
+
+    def db_type(self):
+        "The Oracle geometric data type is MDSYS.SDO_GEOMETRY."
+        return 'MDSYS.SDO_GEOMETRY'
+        
+    def get_placeholder(self, value):
+        """
+        Provides a proper substitution value for Geometries that are not in the
+        SRID of the field.  Specifically, this routine will substitute in the
+        SDO_CS.TRANSFORM() function call.
+        """
+        if value is None:
+            return '%s'
+        elif value.srid != self._srid:
+            # Adding Transform() to the SQL placeholder.
+            return '%s(SDO_GEOMETRY(%%s, %s), %s)' % (TRANSFORM, value.srid, self._srid)
+        else:
+            return 'SDO_GEOMETRY(%%s, %s)' % self._srid