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venv/Lib/site-packages/django/contrib/gis/gdal/feature.py

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+from django.contrib.gis.gdal.base import GDALBase
+from django.contrib.gis.gdal.error import GDALException
+from django.contrib.gis.gdal.field import Field
+from django.contrib.gis.gdal.geometries import OGRGeometry, OGRGeomType
+from django.contrib.gis.gdal.prototypes import ds as capi, geom as geom_api
+from django.utils.encoding import force_bytes, force_str
+
+
+# For more information, see the OGR C API source code:
+#  https://gdal.org/api/vector_c_api.html
+#
+# The OGR_F_* routines are relevant here.
+class Feature(GDALBase):
+    """
+    This class that wraps an OGR Feature, needs to be instantiated
+    from a Layer object.
+    """
+    destructor = capi.destroy_feature
+
+    def __init__(self, feat, layer):
+        """
+        Initialize Feature from a pointer and its Layer object.
+        """
+        if not feat:
+            raise GDALException('Cannot create OGR Feature, invalid pointer given.')
+        self.ptr = feat
+        self._layer = layer
+
+    def __getitem__(self, index):
+        """
+        Get the Field object at the specified index, which may be either
+        an integer or the Field's string label.  Note that the Field object
+        is not the field's _value_ -- use the `get` method instead to
+        retrieve the value (e.g. an integer) instead of a Field instance.
+        """
+        if isinstance(index, str):
+            i = self.index(index)
+        elif 0 <= index < self.num_fields:
+            i = index
+        else:
+            raise IndexError('Index out of range when accessing field in a feature: %s.' % index)
+        return Field(self, i)
+
+    def __len__(self):
+        "Return the count of fields in this feature."
+        return self.num_fields
+
+    def __str__(self):
+        "The string name of the feature."
+        return 'Feature FID %d in Layer<%s>' % (self.fid, self.layer_name)
+
+    def __eq__(self, other):
+        "Do equivalence testing on the features."
+        return bool(capi.feature_equal(self.ptr, other._ptr))
+
+    # #### Feature Properties ####
+    @property
+    def encoding(self):
+        return self._layer._ds.encoding
+
+    @property
+    def fid(self):
+        "Return the feature identifier."
+        return capi.get_fid(self.ptr)
+
+    @property
+    def layer_name(self):
+        "Return the name of the layer for the feature."
+        name = capi.get_feat_name(self._layer._ldefn)
+        return force_str(name, self.encoding, strings_only=True)
+
+    @property
+    def num_fields(self):
+        "Return the number of fields in the Feature."
+        return capi.get_feat_field_count(self.ptr)
+
+    @property
+    def fields(self):
+        "Return a list of fields in the Feature."
+        return [
+            force_str(
+                capi.get_field_name(capi.get_field_defn(self._layer._ldefn, i)),
+                self.encoding,
+                strings_only=True
+            ) for i in range(self.num_fields)
+        ]
+
+    @property
+    def geom(self):
+        "Return the OGR Geometry for this Feature."
+        # Retrieving the geometry pointer for the feature.
+        geom_ptr = capi.get_feat_geom_ref(self.ptr)
+        return OGRGeometry(geom_api.clone_geom(geom_ptr))
+
+    @property
+    def geom_type(self):
+        "Return the OGR Geometry Type for this Feature."
+        return OGRGeomType(capi.get_fd_geom_type(self._layer._ldefn))
+
+    # #### Feature Methods ####
+    def get(self, field):
+        """
+        Return the value of the field, instead of an instance of the Field
+        object.  May take a string of the field name or a Field object as
+        parameters.
+        """
+        field_name = getattr(field, 'name', field)
+        return self[field_name].value
+
+    def index(self, field_name):
+        "Return the index of the given field name."
+        i = capi.get_field_index(self.ptr, force_bytes(field_name))
+        if i < 0:
+            raise IndexError('Invalid OFT field name given: %s.' % field_name)
+        return i