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DataSource is a wrapper for the OGR Data Source object, which provides
an interface for reading vector geometry data from many different file
formats (including ESRI shapefiles).
When instantiating a DataSource object, use the filename of a
GDAL-supported data source. For example, a SHP file or a
TIGER/Line file from the government.
The ds_driver keyword is used internally when a ctypes pointer
is passed in directly.
Example:
ds = DataSource('/home/foo/bar.shp')
for layer in ds:
for feature in layer:
# Getting the geometry for the feature.
g = feature.geom
# Getting the 'description' field for the feature.
desc = feature['description']
# We can also increment through all of the fields
# attached to this feature.
for field in feature:
# Get the name of the field (e.g. 'description')
nm = field.name
# Get the type (integer) of the field, e.g. 0 => OFTInteger
t = field.type
# Returns the value the field; OFTIntegers return ints,
# OFTReal returns floats, all else returns string.
val = field.value
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| j |� � }n1t d|z � � �t dt |� � z � � �t || � � S )z@Allows use of the index [] operator to get a layer at the index.z!Invalid OGR layer name given: %s.r z=Index out of range when accessing layers in a datasource: %s.zInvalid index type: %s)r r r �get_layer_by_namer r
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#� D��E�,�,�,�,�D� ,�,�,�,�,�,� ��t�y�%�8�8��� �!`�ch�!h�i�i�i�� 4�t�E�{�{� B�C�C� C��U�D�!�!�!s �'? � A c � � | j S )z3Return the number of layers within the data source.)r& �r s r �__len__zDataSource.__len__h s � �� � � c �& � | j �d| j �d�S )z2Return OGR GetName and Driver for the Data Source.z (�))�namer r. s r �__str__zDataSource.__str__l s � � �I�I�I�t�{�{�{�3�3r0 c �4 � t j | j � � S )z/Return the number of layers in the data source.)r �get_layer_countr( r. s r r& zDataSource.layer_countp s � � �#�D�I�.�.�.r0 c �b � t j | j � � }t || j d�� � S )z#Return the name of the data source.T)� strings_only)r � get_ds_namer( r r )r r3 s r r3 zDataSource.nameu s- � � � �� �*�*����t�}�4�@�@�@�@r0 N)FFr )�__name__�
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