def _make_feature(self, feat_id):
"""
Helper routine for __getitem__ that constructs a Feature from the given
Feature ID. If the OGR Layer does not support random-access reading,
then each feature of the layer will be incremented through until the
a Feature is found matching the given feature ID.
"""
if self._random_read:
# If the Layer supports random reading, return.
try:
return Feature(capi.get_feature(self.ptr, feat_id), self)
except GDALException:
pass
else:
# Random access isn't supported, have to increment through
# each feature until the given feature ID is encountered.
for feat in self:
if feat.fid == feat_id:
return feat
# Should have returned a Feature, raise an OGRIndexError.
raise OGRIndexError('Invalid feature id: %s.' % feat_id)
def __iter__(self):
"Iterates over each Feature in the Layer."
# ResetReading() must be called before iteration is to begin.
capi.reset_reading(self._ptr)
for i in xrange(self.num_feat):
yield Feature(capi.get_next_feature(self._ptr), self)
def _make_feature(self, offset):
"Helper routine for __getitem__ that makes a feature from an offset."
return Feature(get_feature(self._ptr, offset), self._ldefn)
# A slice was given
start, stop, stride = index.indices(self.num_feat)
return [self._make_feature(fid) for fid in range(start, stop, stride)]
else:
raise TypeError('Integers and slices may only be used when indexing OGR Layers.')
def __iter__(self):
<<<<<<< HEAD
"Iterates over each Feature in the Layer."
=======
"Iterate over each Feature in the Layer."
>>>>>>> 37c99181c9a6b95433d60f8c8ef9af5731096435
# ResetReading() must be called before iteration is to begin.
capi.reset_reading(self._ptr)
for i in range(self.num_feat):
yield Feature(capi.get_next_feature(self._ptr), self)
def __len__(self):
"The length is the number of features."
return self.num_feat
def __str__(self):
"The string name of the layer."
return self.name
def _make_feature(self, feat_id):
"""
Helper routine for __getitem__ that constructs a Feature from the given
Feature ID. If the OGR Layer does not support random-access reading,
then each feature of the layer will be incremented through until the
a Feature is found matching the given feature ID.
