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from django.apps import apps
from django.contrib.gis.db.models.fields import GeometryField
from django.contrib.sitemaps import Sitemap
from django.core import urlresolvers
from django.db import models
class KMLSitemap(Sitemap):
"""
A minimal hook to produce KML sitemaps.
"""
geo_format = 'kml'
def __init__(self, locations=None):
# If no locations specified, then we try to build for
# every model in installed applications.
self.locations = self._build_kml_sources(locations)
def _build_kml_sources(self, sources):
"""
Goes through the given sources and returns a 3-tuple of
the application label, module name, and field name of every
GeometryField encountered in the sources.
If no sources are provided, then all models.
"""
kml_sources = []
if sources is None:
sources = apps.get_models()
for source in sources:
if isinstance(source, models.base.ModelBase):
for field in source._meta.fields:
if isinstance(field, GeometryField):
kml_sources.append((source._meta.app_label,
source._meta.model_name,
field.name))
elif isinstance(source, (list, tuple)):
if len(source) != 3:
raise ValueError('Must specify a 3-tuple of (app_label, module_name, field_name).')
kml_sources.append(source)
else:
raise TypeError('KML Sources must be a model or a 3-tuple.')
return kml_sources
def get_urls(self, page=1, site=None, protocol=None):
"""
This method is overrridden so the appropriate `geo_format` attribute
is placed on each URL element.
"""
urls = Sitemap.get_urls(self, page=page, site=site, protocol=protocol)
for url in urls:
url['geo_format'] = self.geo_format
return urls
def items(self):
return self.locations
def location(self, obj):
return urlresolvers.reverse('django.contrib.gis.sitemaps.views.%s' % self.geo_format,
kwargs={'label': obj[0],
'model': obj[1],
'field_name': obj[2],
}
)
class KMZSitemap(KMLSitemap):
geo_format = 'kmz'
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