def __create_backup_file(self, orig_layer):
file_name = self.backup_path + QDir.separator() + self.layer_id
error = QgsVectorFileWriter.writeAsVectorFormat(orig_layer, file_name, "utf-8", None, "ESRI Shapefile",
False, None, list(), list(), True)
if error == QgsVectorFileWriter.NoError:
QgsMessageLog.logMessage(self.plugin.tr('Backup created.'), self.plugin.tr('Vertex Tools'),
QgsMessageLog.INFO)
def __restore_geometries(self):
src_file_name = self.backup_path + QDir.separator() + self.layer_id + '.shp'
if not QFile.exists(src_file_name):
self.report_message.emit(self.layer_id, 'no backup file')
self.completed = True
return
self.report_message.emit(self.layer_id, 'preparing ...')
orig_layer = QgsMapLayerRegistry.instance().mapLayer(self.layer_id)
# create a copy of the layer just for editing
layer = QgsVectorLayer(orig_layer.source(), orig_layer.name(), orig_layer.providerType())
layer.startEditing()
src_layer = QgsVectorLayer(src_file_name, layer.name(), 'ogr')
total_features = src_layer.featureCount()
QgsMessageLog.logMessage(self.plugin.tr('Features to be restored in layer <{0}>: {1}').
format(orig_layer.name(), total_features), self.plugin.tr('Vertex Tools'),
QgsMessageLog.INFO)
if total_features == 0:
self.report_message.emit(self.layer_id, 'no features to restore')
count = 0
for feature in src_layer.getFeatures():
with QMutexLocker(self.mutex):
if self.stopped:
layer.rollBack()
return
layer.changeGeometry(feature.id(), feature.geometry())
count += 1
self.run_progressed.emit(self.layer_id, count, total_features)
layer.commitChanges()
self.completed = True