mirror of
https://github.com/qgis/QGIS.git
synced 2025-03-09 00:35:20 -05:00
5339d62715
Include descriptive text with the specified parameter value in error, and always check that sources were loaded to avoid raw Python exceptions when they are not
125 lines
4.6 KiB
Python
125 lines
4.6 KiB
Python
# -*- coding: utf-8 -*-
|
|
|
|
"""
|
|
***************************************************************************
|
|
VectorSplit.py
|
|
---------------------
|
|
Date : September 2014
|
|
Copyright : (C) 2014 by Alexander Bruy
|
|
Email : alexander dot bruy at gmail dot com
|
|
***************************************************************************
|
|
* *
|
|
* This program is free software; you can redistribute it and/or modify *
|
|
* it under the terms of the GNU General Public License as published by *
|
|
* the Free Software Foundation; either version 2 of the License, or *
|
|
* (at your option) any later version. *
|
|
* *
|
|
***************************************************************************
|
|
"""
|
|
|
|
__author__ = 'Alexander Bruy'
|
|
__date__ = 'September 2014'
|
|
__copyright__ = '(C) 2014, Alexander Bruy'
|
|
|
|
# This will get replaced with a git SHA1 when you do a git archive
|
|
|
|
__revision__ = '$Format:%H$'
|
|
|
|
import os
|
|
|
|
from qgis.core import (QgsProcessingUtils,
|
|
QgsFeatureSink,
|
|
QgsProcessingParameterFeatureSource,
|
|
QgsProcessingParameterField,
|
|
QgsProcessingParameterFolderDestination,
|
|
QgsProcessingOutputFolder,
|
|
QgsProcessingException,
|
|
QgsProcessingOutputMultipleLayers,
|
|
QgsExpression,
|
|
QgsFeatureRequest)
|
|
|
|
from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
|
|
from processing.tools.system import mkdir
|
|
|
|
pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
|
|
|
|
|
|
class VectorSplit(QgisAlgorithm):
|
|
|
|
INPUT = 'INPUT'
|
|
FIELD = 'FIELD'
|
|
OUTPUT = 'OUTPUT'
|
|
OUTPUT_LAYERS = 'OUTPUT_LAYERS'
|
|
|
|
def group(self):
|
|
return self.tr('Vector general')
|
|
|
|
def groupId(self):
|
|
return 'vectorgeneral'
|
|
|
|
def __init__(self):
|
|
super().__init__()
|
|
|
|
def initAlgorithm(self, config=None):
|
|
self.addParameter(QgsProcessingParameterFeatureSource(self.INPUT,
|
|
self.tr('Input layer')))
|
|
|
|
self.addParameter(QgsProcessingParameterField(self.FIELD,
|
|
self.tr('Unique ID field'), None, self.INPUT))
|
|
|
|
self.addParameter(QgsProcessingParameterFolderDestination(self.OUTPUT,
|
|
self.tr('Output directory')))
|
|
self.addOutput(QgsProcessingOutputMultipleLayers(self.OUTPUT_LAYERS, self.tr('Output layers')))
|
|
|
|
def name(self):
|
|
return 'splitvectorlayer'
|
|
|
|
def displayName(self):
|
|
return self.tr('Split vector layer')
|
|
|
|
def processAlgorithm(self, parameters, context, feedback):
|
|
source = self.parameterAsSource(parameters, self.INPUT, context)
|
|
if source is None:
|
|
raise QgsProcessingException(self.invalidSourceError(parameters, self.INPUT))
|
|
|
|
fieldName = self.parameterAsString(parameters, self.FIELD, context)
|
|
directory = self.parameterAsString(parameters, self.OUTPUT, context)
|
|
|
|
mkdir(directory)
|
|
|
|
fieldIndex = source.fields().lookupField(fieldName)
|
|
uniqueValues = source.uniqueValues(fieldIndex)
|
|
baseName = os.path.join(directory, '{0}'.format(fieldName))
|
|
|
|
fields = source.fields()
|
|
crs = source.sourceCrs()
|
|
geomType = source.wkbType()
|
|
|
|
total = 100.0 / len(uniqueValues) if uniqueValues else 1
|
|
output_layers = []
|
|
|
|
for current, i in enumerate(uniqueValues):
|
|
if feedback.isCanceled():
|
|
break
|
|
fName = u'{0}_{1}.shp'.format(baseName, str(i).strip())
|
|
feedback.pushInfo(self.tr('Creating layer: {}').format(fName))
|
|
|
|
sink, dest = QgsProcessingUtils.createFeatureSink(fName, context, fields, geomType, crs)
|
|
|
|
filter = '{} = {}'.format(QgsExpression.quotedColumnRef(fieldName), QgsExpression.quotedValue(i))
|
|
req = QgsFeatureRequest().setFilterExpression(filter)
|
|
|
|
count = 0
|
|
for f in source.getFeatures(req):
|
|
if feedback.isCanceled():
|
|
break
|
|
sink.addFeature(f, QgsFeatureSink.FastInsert)
|
|
count += 1
|
|
feedback.pushInfo(self.tr('Added {} features to layer').format(count))
|
|
output_layers.append(fName)
|
|
del sink
|
|
|
|
feedback.setProgress(int(current * total))
|
|
|
|
return {self.OUTPUT: directory, self.OUTPUT_LAYERS: output_layers}
|