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1e13d733c2
initAlgorithm() method This allows 2 benefits: - algorithms can be subclassed and have subclasses add additional parameters/outputs to the algorithm. With the previous approach of declaring parameters/outputs in the constructor, it's not possible to call virtual methods to add additional parameters/ outputs (since you can't call virtual methods from a constructor). - initAlgorithm takes a variant map argument, allowing the algorithm to dynamically adjust its declared parameters and outputs according to this configuration map. This potentially allows model algorithms which can be configured to have variable numbers of parameters and outputs at run time. E.g. a "router" algorithm which directs features to one of any number of output sinks depending on some user configured criteria.
165 lines
6.6 KiB
Python
165 lines
6.6 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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QgsField,
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QgsFeatureRequest,
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QgsFeatureSink,
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QgsProcessing,
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QgsProcessingUtils,
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QgsProcessingParameterMultipleLayers,
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QgsProcessingParameterDefinition,
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QgsProcessingParameterFeatureSink,
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QgsProcessingOutputVectorLayer,
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QgsMapLayer)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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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(QgisAlgorithm):
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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 __init__(self):
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super().__init__()
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def initAlgorithm(self, config=None):
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self.addParameter(QgsProcessingParameterMultipleLayers(self.LAYERS,
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self.tr('Layers to merge'),
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QgsProcessing.TypeVectorAny))
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self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT, self.tr('Merged')))
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self.addOutput(QgsProcessingOutputVectorLayer(self.OUTPUT, self.tr('Merged')))
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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 processAlgorithm(self, parameters, context, feedback):
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input_layers = self.parameterAsLayerList(parameters, self.LAYERS, context)
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layers = []
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fields = QgsFields()
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totalFeatureCount = 0
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for layer in input_layers:
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if layer.type() != QgsMapLayer.VectorLayer:
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raise GeoAlgorithmExecutionException(
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self.tr('All layers must be vector layers!'))
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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.'.format(sfield.name(), layerSource)))
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if not found:
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fields.append(sfield)
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add_layer_field = False
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if fields.lookupField('layer') < 0:
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fields.append(QgsField('layer', QVariant.String, '', 100))
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add_layer_field = True
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add_path_field = False
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if fields.lookupField('path') < 0:
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fields.append(QgsField('path', QVariant.String, '', 200))
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add_path_field = True
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total = 100.0 / totalFeatureCount if totalFeatureCount else 1
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dest_crs = layers[0].crs()
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(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
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fields, layers[0].wkbType(), dest_crs)
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featureCount = 0
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for layer in layers:
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for feature in layer.getFeatures(QgsFeatureRequest().setDestinationCrs(dest_crs)):
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if feedback.isCanceled():
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break
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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 add_layer_field and dfield.name() == 'layer':
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dattributes.append(layer.name())
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continue
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if add_path_field and dfield.name() == 'path':
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dattributes.append(layer.publicSource())
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continue
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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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sink.addFeature(feature, QgsFeatureSink.FastInsert)
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featureCount += 1
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feedback.setProgress(int(featureCount * total))
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return {self.OUTPUT: dest_id}
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