app/django/contrib/gis/db/backend/postgis/adaptor.py
author Lennard de Rijk <ljvderijk@gmail.com>
Sat, 28 Feb 2009 21:12:20 +0000
changeset 1567 b5589e656ed1
parent 323 ff1a9aa48cfd
permissions -rw-r--r--
Member template in organization is now called Contributor Template. This matches the Organization Application, this way the information is automatically transferred to the new Organization. Note that the template shows raw HTML, we might change the template tag to use |safe for it's input to show the true layout of the template. I've sent an email to SRabbelier about that. Patch by: Lennard de Rijk Reviewed by: to-be-reviewed

"""
 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)