app/django/contrib/gis/db/backend/postgis/adaptor.py
author Lennard de Rijk <ljvderijk@gmail.com>
Sat, 07 Mar 2009 17:55:14 +0000
changeset 1720 33e34c4716d2
parent 323 ff1a9aa48cfd
permissions -rw-r--r--
Removed the street address from influencing the maps plug in. Legally we are not allowed to publish people's street address, people can drag the marker to their street if they wish to, we are now using the postal code which would be a region within a city (if this is too much we might also take this out). Patch by: Mario Ferraro Reviewed by: Lennard de Rijk

"""
 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)