class Topology(AltimetryMixin, TimeStampedModel, NoDeleteMixin):
paths = models.ManyToManyField(Path,
editable=False,
db_column='troncons',
through='PathAggregation',
verbose_name=_(u"Path"))
offset = models.FloatField(default=0.0,
db_column='decallage',
verbose_name=_(u"Offset")) # in SRID units
kind = models.CharField(editable=False,
verbose_name=_(u"Kind"),
max_length=32)
# Override default manager
objects = NoDeleteMixin.get_manager_cls(models.GeoManager)()
geom = models.GeometryField(editable=False,
srid=settings.SRID,
null=True,
blank=True,
spatial_index=False,
dim=3)
class Meta:
db_table = 'e_t_evenement'
verbose_name = _(u"Topology")
verbose_name_plural = _(u"Topologies")
def __init__(self, *args, **kwargs):
super(Topology, self).__init__(*args, **kwargs)
if not self.pk:
self.kind = self.__class__.KIND
@classmethod
def add_property(cls, name, func):
if hasattr(cls, name):
raise AttributeError("%s has already an attribute %s" %
(cls, name))
setattr(cls, name, property(func))
@classproperty
def KIND(cls):
return cls._meta.object_name.upper()
def __unicode__(self):
return u"%s (%s)" % (_(u"Topology"), self.pk)
def ispoint(self):
if not self.pk and self.geom and self.geom.geom_type == 'Point':
return True
return all([
a.start_position == a.end_position
for a in self.aggregations.all()
])
def geom_as_point(self):
geom = self.geom
assert geom, 'Topology point is None'
if geom.geom_type != 'Point':
logger.warning(
"Topology has wrong geometry type : %s instead of Point" %
geom.geom_type)
geom = Point(geom.coords[0], srid=settings.SRID)
return geom
def add_path(self, path, start=0.0, end=1.0, order=0, reload=True):
"""
Shortcut function to add paths into this topology.
"""
from .factories import PathAggregationFactory
aggr = PathAggregationFactory.create(topo_object=self,
path=path,
start_position=start,
end_position=end,
order=order)
# Since a trigger modifies geom, we reload the object
if reload:
self.reload()
return aggr
@classmethod
def overlapping(cls, topologies):
""" Return a Topology queryset overlapping specified topologies.
"""
return TopologyHelper.overlapping(cls, topologies)
def mutate(self, other, delete=True):
"""
Take alls attributes of the other topology specified and
save them into this one. Optionnally deletes the other.
"""
self.offset = other.offset
self.geom = other.geom
self.save()
PathAggregation.objects.filter(topo_object=self).delete()
aggrs = other.aggregations.all()
# A point has only one aggregation, except if it is on an intersection.
# In this case, the trigger will create them, so ignore them here.
if other.ispoint():
aggrs = aggrs[:1]
for aggr in aggrs:
self.add_path(aggr.path,
aggr.start_position,
aggr.end_position,
aggr.order,
reload=False)
if delete:
other.delete(force=True) # Really delete it from database
self.save()
return self
def reload(self, fromdb=None):
"""
Reload into instance all computed attributes in triggers.
"""
if self.pk:
# Update computed values
fromdb = self.__class__.objects.get(pk=self.pk)
self.geom = fromdb.geom
self.offset = fromdb.offset # /!\ offset may be set by a trigger OR in
# the django code, reload() will override
# any unsaved value
AltimetryMixin.reload(self, fromdb)
TimeStampedModel.reload(self, fromdb)
NoDeleteMixin.reload(self, fromdb)
return self
@debug_pg_notices
def save(self, *args, **kwargs):
# HACK: these fields are readonly from the Django point of view
# but they can be changed at DB level. Since Django write all fields
# to DB anyway, it is important to update it before writting
if self.pk:
tmp = self.__class__.objects.get(pk=self.pk)
self.length = tmp.length
# In the case of points, the geom can be set by Django. Don't override.
if (self.ispoint() and self.geom is None) or \
(not self.ispoint() and tmp.geom is not None):
self.geom = tmp.geom
if not self.kind:
if self.KIND == "TOPOLOGYMIXIN":
raise Exception("Cannot save abstract topologies")
self.kind = self.__class__.KIND
# Static value for Topology offset, if any
shortmodelname = self._meta.object_name.lower().replace('edge', '')
self.offset = settings.TOPOLOGY_STATIC_OFFSETS.get(
shortmodelname, self.offset)
# Save into db
super(Topology, self).save(*args, **kwargs)
self.reload()
def serialize(self):
return TopologyHelper.serialize(self)
@classmethod
def deserialize(cls, serialized):
return TopologyHelper.deserialize(serialized)
class Topology(AltimetryMixin, TimeStampedModel, NoDeleteMixin):
paths = models.ManyToManyField(Path,
editable=False,
db_column='troncons',
through='PathAggregation',
verbose_name=_(u"Path"))
offset = models.FloatField(default=0.0,
db_column='decallage',
verbose_name=_(u"Offset")) # in SRID units
kind = models.CharField(editable=False,
verbose_name=_(u"Kind"),
max_length=32)
# Override default manager
objects = NoDeleteMixin.get_manager_cls(models.GeoManager)()
geom = models.GeometryField(
editable=(not settings.TREKKING_TOPOLOGY_ENABLED),
srid=settings.SRID,
null=True,
default=None,
spatial_index=False)
""" Fake srid attribute, that prevents transform() calls when using Django map widgets. """
srid = settings.API_SRID
class Meta:
db_table = 'e_t_evenement'
verbose_name = _(u"Topology")
verbose_name_plural = _(u"Topologies")
def __init__(self, *args, **kwargs):
super(Topology, self).__init__(*args, **kwargs)
if not self.pk:
self.kind = self.__class__.KIND
@classmethod
def add_property(cls, name, func):
if hasattr(cls, name):
raise AttributeError("%s has already an attribute %s" %
(cls, name))
setattr(cls, name, property(func))
@classproperty
def KIND(cls):
return cls._meta.object_name.upper()
def __unicode__(self):
return u"%s (%s)" % (_(u"Topology"), self.pk)
def ispoint(self):
if not self.pk and self.geom and self.geom.geom_type == 'Point':
return True
return all([
a.start_position == a.end_position
for a in self.aggregations.all()
])
def add_path(self, path, start=0.0, end=1.0, order=0, reload=True):
"""
Shortcut function to add paths into this topology.
"""
from .factories import PathAggregationFactory
aggr = PathAggregationFactory.create(topo_object=self,
path=path,
start_position=start,
end_position=end,
order=order)
if self.deleted:
self.deleted = False
self.save(update_fields=['deleted'])
# Since a trigger modifies geom, we reload the object
if reload:
self.reload()
return aggr
@classmethod
def overlapping(cls, topologies):
""" Return a Topology queryset overlapping specified topologies.
"""
return TopologyHelper.overlapping(cls, topologies)
def mutate(self, other, delete=True):
"""
Take alls attributes of the other topology specified and
save them into this one. Optionnally deletes the other.
"""
self.offset = other.offset
self.save(update_fields=['offset'])
PathAggregation.objects.filter(topo_object=self).delete()
# The previous operation has put deleted = True (in triggers)
# and NULL in geom (see update_geometry_of_evenement:: IF t_count = 0)
self.deleted = False
self.geom = other.geom
self.save(update_fields=['deleted', 'geom'])
# Now copy all agregations from other to self
aggrs = other.aggregations.all()
# A point has only one aggregation, except if it is on an intersection.
# In this case, the trigger will create them, so ignore them here.
if other.ispoint():
aggrs = aggrs[:1]
for aggr in aggrs:
self.add_path(aggr.path,
aggr.start_position,
aggr.end_position,
aggr.order,
reload=False)
self.reload()
if delete:
other.delete(force=True) # Really delete it from database
return self
def reload(self, fromdb=None):
"""
Reload into instance all computed attributes in triggers.
"""
if self.pk:
# Update computed values
fromdb = self.__class__.objects.get(pk=self.pk)
self.geom = fromdb.geom
self.offset = fromdb.offset # /!\ offset may be set by a trigger OR in
# the django code, reload() will override
# any unsaved value
AltimetryMixin.reload(self, fromdb)
TimeStampedModel.reload(self, fromdb)
NoDeleteMixin.reload(self, fromdb)
return self
@debug_pg_notices
def save(self, *args, **kwargs):
# HACK: these fields are readonly from the Django point of view
# but they can be changed at DB level. Since Django write all fields
# to DB anyway, it is important to update it before writting
if self.pk and settings.TREKKING_TOPOLOGY_ENABLED:
existing = self.__class__.objects.get(pk=self.pk)
self.length = existing.length
# In the case of points, the geom can be set by Django. Don't override.
point_geom_not_set = self.ispoint() and self.geom is None
geom_already_in_db = not self.ispoint(
) and existing.geom is not None
if (point_geom_not_set or geom_already_in_db):
self.geom = existing.geom
else:
if not self.deleted and self.geom is None:
# We cannot have NULL geometry. So we use an empty one,
# it will be computed or overwritten by triggers.
self.geom = fromstr('POINT (0 0)')
if not self.kind:
if self.KIND == "TOPOLOGYMIXIN":
raise Exception("Cannot save abstract topologies")
self.kind = self.__class__.KIND
# Static value for Topology offset, if any
shortmodelname = self._meta.object_name.lower().replace('edge', '')
self.offset = settings.TOPOLOGY_STATIC_OFFSETS.get(
shortmodelname, self.offset)
# Save into db
super(Topology, self).save(*args, **kwargs)
self.reload()
def serialize(self, **kwargs):
return TopologyHelper.serialize(self, **kwargs)
@classmethod
def deserialize(cls, serialized):
return TopologyHelper.deserialize(serialized)