--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/app/django/contrib/gis/db/backend/postgis/adaptor.py	Tue Oct 14 16:00:59 2008 +0000
@@ -0,0 +1,33 @@
+"""
+ This object provides quoting for GEOS geometries into PostgreSQL/PostGIS.
+"""
+
+from django.contrib.gis.db.backend.postgis.query import GEOM_FROM_WKB
+from psycopg2 import Binary
+from psycopg2.extensions import ISQLQuote
+
+class PostGISAdaptor(object):
+    def __init__(self, geom):
+        "Initializes on the geometry."
+        # Getting the WKB (in string form, to allow easy pickling of
+        # the adaptor) and the SRID from the geometry.
+        self.wkb = str(geom.wkb)
+        self.srid = geom.srid
+
+    def __conform__(self, proto):
+        # Does the given protocol conform to what Psycopg2 expects?
+        if proto == ISQLQuote:
+            return self
+        else:
+            raise Exception('Error implementing psycopg2 protocol. Is psycopg2 installed?')
+
+    def __eq__(self, other):
+        return (self.wkb == other.wkb) and (self.srid == other.srid)
+
+    def __str__(self):
+        return self.getquoted()
+
+    def getquoted(self):
+        "Returns a properly quoted string for use in PostgreSQL/PostGIS."
+        # Want to use WKB, so wrap with psycopg2 Binary() to quote properly.
+        return "%s(%s, %s)" % (GEOM_FROM_WKB, Binary(self.wkb), self.srid or -1)