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fd2c18ee16
temporary output layers in the provided processing context Should fix loss of intermediate memory layers when running a multi-step model
129 lines
4.9 KiB
Python
129 lines
4.9 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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Gridify.py
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---------------------
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Date : May 2010
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Copyright : (C) 2010 by Michael Minn
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Email : pyqgis at michaelminn dot com
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***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************
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"""
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__author__ = 'Michael Minn'
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__date__ = 'May 2010'
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__copyright__ = '(C) 2010, Michael Minn'
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# This will get replaced with a git SHA1 when you do a git archive
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__revision__ = '$Format:%H$'
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import os
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from qgis.PyQt.QtGui import QIcon
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from qgis.PyQt.QtCore import QVariant
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from qgis.core import QgsFields
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
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from processing.core.parameters import ParameterMultipleInput
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from processing.core.outputs import OutputVector
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from processing.tools import dataobjects
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class Merge(GeoAlgorithm):
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LAYERS = 'LAYERS'
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OUTPUT = 'OUTPUT'
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def icon(self):
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return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'merge_shapes.png'))
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def group(self):
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return self.tr('Vector general tools')
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def name(self):
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return 'mergevectorlayers'
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def displayName(self):
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return self.tr('Merge vector layers')
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def defineCharacteristics(self):
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self.addParameter(ParameterMultipleInput(self.LAYERS,
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self.tr('Layers to merge'),
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datatype=dataobjects.TYPE_VECTOR_ANY))
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self.addOutput(OutputVector(self.OUTPUT, self.tr('Merged')))
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def processAlgorithm(self, context, feedback):
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inLayers = self.getParameterValue(self.LAYERS)
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layers = []
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fields = QgsFields()
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totalFeatureCount = 0
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for layerSource in inLayers.split(';'):
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layer = dataobjects.getLayerFromString(layerSource)
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if (len(layers) > 0):
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if (layer.wkbType() != layers[0].wkbType()):
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raise GeoAlgorithmExecutionException(
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self.tr('All layers must have same geometry type!'))
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layers.append(layer)
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totalFeatureCount += layer.featureCount()
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for sindex, sfield in enumerate(layer.fields()):
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found = None
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for dfield in fields:
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if (dfield.name().upper() == sfield.name().upper()):
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found = dfield
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if (dfield.type() != sfield.type()):
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raise GeoAlgorithmExecutionException(
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self.tr('{} field in layer {} has different '
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'data type than in other layers.'))
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if not found:
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fields.append(sfield)
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total = 100.0 / totalFeatureCount
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writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(fields.toList(), layers[0].wkbType(),
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layers[0].crs(), context)
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featureCount = 0
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for layer in layers:
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for feature in layer.getFeatures():
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sattributes = feature.attributes()
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dattributes = []
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for dindex, dfield in enumerate(fields):
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if (dfield.type() == QVariant.Int, QVariant.UInt, QVariant.LongLong, QVariant.ULongLong):
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dattribute = 0
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elif (dfield.type() == QVariant.Double):
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dattribute = 0.0
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else:
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dattribute = ''
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for sindex, sfield in enumerate(layer.fields()):
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if (sfield.name().upper() == dfield.name().upper()):
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if (sfield.type() != dfield.type()):
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raise GeoAlgorithmExecutionException(
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self.tr('Attribute type mismatch'))
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dattribute = sattributes[sindex]
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break
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dattributes.append(dattribute)
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feature.setAttributes(dattributes)
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writer.addFeature(feature)
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featureCount += 1
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feedback.setProgress(int(featureCount * total))
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del writer
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