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Directory :  /srv/modoboa/env/lib/python3.5/site-packages/django/contrib/gis/db/backends/base/

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Current File : /srv/modoboa/env/lib/python3.5/site-packages/django/contrib/gis/db/backends/base/features.py
import re

from django.contrib.gis.db.models import aggregates


class BaseSpatialFeatures:
    gis_enabled = True

    # Does the database contain a SpatialRefSys model to store SRID information?
    has_spatialrefsys_table = True

    # Does the backend support the django.contrib.gis.utils.add_srs_entry() utility?
    supports_add_srs_entry = True
    # Does the backend introspect GeometryField to its subtypes?
    supports_geometry_field_introspection = True

    # Does the backend support storing 3D geometries?
    supports_3d_storage = False
    # Reference implementation of 3D functions is:
    # https://postgis.net/docs/PostGIS_Special_Functions_Index.html#PostGIS_3D_Functions
    supports_3d_functions = False
    # Does the database support SRID transform operations?
    supports_transform = True
    # Do geometric relationship operations operate on real shapes (or only on bounding boxes)?
    supports_real_shape_operations = True
    # Can geometry fields be null?
    supports_null_geometries = True
    # Are empty geometries supported?
    supports_empty_geometries = False
    # Can the function be applied on geodetic coordinate systems?
    supports_distance_geodetic = True
    supports_length_geodetic = True
    supports_perimeter_geodetic = False
    supports_area_geodetic = True
    # Is the database able to count vertices on polygons (with `num_points`)?
    supports_num_points_poly = True

    # The following properties indicate if the database backend support
    # certain lookups (dwithin, left and right, relate, ...)
    supports_left_right_lookups = False

    # Does the database have raster support?
    supports_raster = False

    # Does the database support a unique index on geometry fields?
    supports_geometry_field_unique_index = True

    @property
    def supports_bbcontains_lookup(self):
        return 'bbcontains' in self.connection.ops.gis_operators

    @property
    def supports_contained_lookup(self):
        return 'contained' in self.connection.ops.gis_operators

    @property
    def supports_crosses_lookup(self):
        return 'crosses' in self.connection.ops.gis_operators

    @property
    def supports_distances_lookups(self):
        return self.has_Distance_function

    @property
    def supports_dwithin_lookup(self):
        return 'dwithin' in self.connection.ops.gis_operators

    @property
    def supports_relate_lookup(self):
        return 'relate' in self.connection.ops.gis_operators

    @property
    def supports_isvalid_lookup(self):
        return self.has_IsValid_function

    # Is the aggregate supported by the database?
    @property
    def supports_collect_aggr(self):
        return aggregates.Collect not in self.connection.ops.disallowed_aggregates

    @property
    def supports_extent_aggr(self):
        return aggregates.Extent not in self.connection.ops.disallowed_aggregates

    @property
    def supports_make_line_aggr(self):
        return aggregates.MakeLine not in self.connection.ops.disallowed_aggregates

    @property
    def supports_union_aggr(self):
        return aggregates.Union not in self.connection.ops.disallowed_aggregates

    def __getattr__(self, name):
        m = re.match(r'has_(\w*)_function$', name)
        if m:
            func_name = m.group(1)
            return func_name not in self.connection.ops.unsupported_functions
        raise AttributeError

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