def build_vector_layer_import_command(self, variable_name, layer, context,
feedback):
"""
Returns an import command for the specified vector layer, storing it in a variable
"""
if layer is None:
return self.r_templates.set_variable_null(variable_name)
is_ogr_disk_based_layer = layer is not None and layer.dataProvider(
).name() == 'ogr'
if is_ogr_disk_based_layer:
# we only support direct reading of disk based ogr layers -- not ogr postgres layers, etc
source_parts = QgsProviderRegistry.instance().decodeUri(
'ogr', layer.source())
if not source_parts.get('path'):
is_ogr_disk_based_layer = False
elif source_parts.get('layerId'):
# no support for directly reading layers by id in R
is_ogr_disk_based_layer = False
if not is_ogr_disk_based_layer:
# parameter is not a vector layer or not an OGR layer - try to convert to a source compatible with
# R OGR inputs and extract selection if required
path = QgsProcessingUtils.convertToCompatibleFormat(
layer,
False,
variable_name,
compatibleFormats=QgsVectorFileWriter.
supportedFormatExtensions(),
preferredFormat='gpkg',
context=context,
feedback=feedback)
ogr_layer = QgsVectorLayer(path, '', 'ogr')
return self.load_vector_layer_command(variable_name, ogr_layer,
None)
# already an ogr disk based layer source
return self.load_vector_layer_command(variable_name, layer, None)
