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Algorithms and other processing code should use this method (instead of dataobjects.getLayerFromString) to retrieve layers from a string, as it considers the processing context and allows resolving strings to temporarily stored layers. This permits processing models to function correctly when intermediate results are stored as memory layers. Subsequent model algorithms can then access these temporary layers as inputs. All temporary layers will be removed when the context object is destroyed after the model algorithm is run.
349 lines
13 KiB
Python
349 lines
13 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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dataobject.py
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---------------------
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Date : August 2012
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Copyright : (C) 2012 by Victor Olaya
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Email : volayaf at gmail 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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from builtins import str
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__author__ = 'Victor Olaya'
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__date__ = 'August 2012'
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__copyright__ = '(C) 2012, Victor Olaya'
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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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import re
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from qgis.core import (QgsVectorFileWriter,
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QgsMapLayer,
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QgsRasterLayer,
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QgsWkbTypes,
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QgsVectorLayer,
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QgsProject,
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QgsCoordinateReferenceSystem,
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QgsSettings,
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QgsProcessingUtils,
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QgsProcessingContext)
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from qgis.gui import QgsSublayersDialog
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from qgis.PyQt.QtCore import QCoreApplication
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from processing.core.ProcessingConfig import ProcessingConfig
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from processing.algs.gdal.GdalUtils import GdalUtils
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from processing.tools.system import (getTempFilenameInTempFolder,
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getTempFilename,
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removeInvalidChars,
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isWindows)
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from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
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ALL_TYPES = [-1]
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TYPE_VECTOR_ANY = -1
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TYPE_VECTOR_POINT = 0
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TYPE_VECTOR_LINE = 1
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TYPE_VECTOR_POLYGON = 2
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TYPE_RASTER = 3
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TYPE_FILE = 4
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TYPE_TABLE = 5
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def createContext():
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"""
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Creates a default processing context
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"""
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context = QgsProcessingContext()
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context.setProject(QgsProject.instance())
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use_selection = ProcessingConfig.getSetting(ProcessingConfig.USE_SELECTED)
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if use_selection:
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context.setFlags(QgsProcessingContext.UseSelectionIfPresent)
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invalid_features_method = ProcessingConfig.getSetting(ProcessingConfig.FILTER_INVALID_GEOMETRIES)
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context.setInvalidGeometryCheck(invalid_features_method)
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def raise_error(f):
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raise GeoAlgorithmExecutionException(QCoreApplication.translate("FeatureIterator",
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'Features with invalid geometries found. Please fix these geometries or specify the "Ignore invalid input features" flag'))
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context.setInvalidGeometryCallback(raise_error)
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return context
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def getSupportedOutputRasterLayerExtensions():
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allexts = []
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for exts in list(GdalUtils.getSupportedRasters().values()):
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for ext in exts:
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if ext != 'tif' and ext not in allexts:
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allexts.append(ext)
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allexts.sort()
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allexts.insert(0, 'tif') # tif is the default, should be the first
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return allexts
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def extent(layers):
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first = True
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context = createContext()
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for layer in layers:
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if not isinstance(layer, (QgsMapLayer.QgsRasterLayer, QgsMapLayer.QgsVectorLayer)):
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layer = QgsProcessingUtils.mapLayerFromString(layer, context)
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if layer is None:
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continue
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if first:
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xmin = layer.extent().xMinimum()
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xmax = layer.extent().xMaximum()
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ymin = layer.extent().yMinimum()
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ymax = layer.extent().yMaximum()
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else:
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xmin = min(xmin, layer.extent().xMinimum())
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xmax = max(xmax, layer.extent().xMaximum())
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ymin = min(ymin, layer.extent().yMinimum())
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ymax = max(ymax, layer.extent().yMaximum())
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first = False
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if first:
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return '0,0,0,0'
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else:
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return str(xmin) + ',' + str(xmax) + ',' + str(ymin) + ',' + str(ymax)
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def loadList(layers):
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for layer in layers:
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load(layer)
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def load(fileName, name=None, crs=None, style=None):
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"""Loads a layer/table into the current project, given its file.
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"""
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if fileName is None:
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return
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prjSetting = None
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settings = QgsSettings()
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if crs is not None:
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prjSetting = settings.value('/Projections/defaultBehavior')
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settings.setValue('/Projections/defaultBehavior', '')
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if name is None:
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name = os.path.split(fileName)[1]
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qgslayer = QgsVectorLayer(fileName, name, 'ogr')
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if qgslayer.isValid():
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if crs is not None and qgslayer.crs() is None:
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qgslayer.setCrs(crs, False)
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if style is None:
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if qgslayer.geometryType() == QgsWkbTypes.PointGeometry:
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style = ProcessingConfig.getSetting(ProcessingConfig.VECTOR_POINT_STYLE)
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elif qgslayer.geometryType() == QgsWkbTypes.LineGeometry:
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style = ProcessingConfig.getSetting(ProcessingConfig.VECTOR_LINE_STYLE)
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else:
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style = ProcessingConfig.getSetting(ProcessingConfig.VECTOR_POLYGON_STYLE)
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qgslayer.loadNamedStyle(style)
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QgsProject.instance().addMapLayers([qgslayer])
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else:
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qgslayer = QgsRasterLayer(fileName, name)
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if qgslayer.isValid():
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if crs is not None and qgslayer.crs() is None:
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qgslayer.setCrs(crs, False)
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if style is None:
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style = ProcessingConfig.getSetting(ProcessingConfig.RASTER_STYLE)
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qgslayer.loadNamedStyle(style)
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QgsProject.instance().addMapLayers([qgslayer])
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else:
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if prjSetting:
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settings.setValue('/Projections/defaultBehavior', prjSetting)
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raise RuntimeError('Could not load layer: ' + str(fileName) +
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'\nCheck the processing framework log to look for errors')
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if prjSetting:
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settings.setValue('/Projections/defaultBehavior', prjSetting)
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return qgslayer
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def exportVectorLayer(layer, supported=None):
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"""Takes a QgsVectorLayer and returns the filename to refer to it,
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which allows external apps which support only file-based layers to
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use it. It performs the necessary export in case the input layer
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is not in a standard format suitable for most applications, it is
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a remote one or db-based (non-file based) one, or if there is a
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selection and it should be used, exporting just the selected
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features.
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Currently, the output is restricted to shapefiles, so anything
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that is not in a shapefile will get exported. It also export to
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a new file if the original one contains non-ascii characters.
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"""
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supported = supported or ["shp"]
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settings = QgsSettings()
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systemEncoding = settings.value('/UI/encoding', 'System')
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output = getTempFilename('shp')
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basename = removeInvalidChars(os.path.basename(layer.source()))
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if basename:
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if not basename.endswith("shp"):
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basename = os.path.splitext(basename)[0] + ".shp"
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output = getTempFilenameInTempFolder(basename)
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else:
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output = getTempFilename("shp")
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useSelection = ProcessingConfig.getSetting(ProcessingConfig.USE_SELECTED)
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if useSelection and layer.selectedFeatureCount() != 0:
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writer = QgsVectorFileWriter(output, systemEncoding,
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layer.fields(),
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layer.wkbType(), layer.crs())
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selection = layer.selectedFeatures()
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for feat in selection:
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writer.addFeature(feat)
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del writer
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return output
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else:
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if not os.path.splitext(layer.source())[1].lower() in supported:
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writer = QgsVectorFileWriter(
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output, systemEncoding,
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layer.fields(), layer.wkbType(),
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layer.crs()
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)
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for feat in layer.getFeatures():
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writer.addFeature(feat)
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del writer
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return output
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else:
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return layer.source()
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def exportRasterLayer(layer):
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"""Takes a QgsRasterLayer and returns the filename to refer to it,
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which allows external apps which support only file-based layers to
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use it. It performs the necessary export in case the input layer
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is not in a standard format suitable for most applications, it is
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a remote one or db-based (non-file based) one.
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Currently, the output is restricted to geotiff, but not all other
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formats are exported. Only those formats not supported by GDAL are
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exported, so it is assumed that the external app uses GDAL to read
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the layer.
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"""
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# TODO: Do the conversion here
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return str(layer.source())
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def exportTable(table):
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"""Takes a QgsVectorLayer and returns the filename to refer to its
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attributes table, which allows external apps which support only
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file-based layers to use it.
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It performs the necessary export in case the input layer is not in
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a standard format suitable for most applications, it isa remote
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one or db-based (non-file based) one.
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Currently, the output is restricted to DBF. It also export to a new
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file if the original one contains non-ascii characters.
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"""
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settings = QgsSettings()
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systemEncoding = settings.value('/UI/encoding', 'System')
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output = getTempFilename()
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isASCII = True
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try:
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str(table.source()).decode('ascii')
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except UnicodeEncodeError:
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isASCII = False
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isDbf = str(table.source()).endswith('dbf') \
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or str(table.source()).endswith('shp')
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if not isDbf or not isASCII:
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writer = QgsVectorFileWriter(output, systemEncoding,
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table.fields(), QgsWkbTypes.NullGeometry,
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QgsCoordinateReferenceSystem('4326'))
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for feat in table.getFeatures():
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writer.addFeature(feat)
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del writer
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return output + '.dbf'
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else:
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filename = str(table.source())
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if str(table.source()).endswith('shp'):
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return filename[:-3] + 'dbf'
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else:
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return filename
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def getRasterSublayer(path, param):
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layer = QgsRasterLayer(path)
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try:
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# If the layer is a raster layer and has multiple sublayers, let the user chose one.
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# Based on QgisApp::askUserForGDALSublayers
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if layer and param.showSublayersDialog and layer.dataProvider().name() == "gdal" and len(layer.subLayers()) > 1:
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layers = []
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subLayerNum = 0
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# simplify raster sublayer name
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for subLayer in layer.subLayers():
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# if netcdf/hdf use all text after filename
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if bool(re.match('netcdf', subLayer, re.I)) or bool(re.match('hdf', subLayer, re.I)):
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subLayer = subLayer.split(path)[1]
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subLayer = subLayer[1:]
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else:
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# remove driver name and file name
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subLayer.replace(subLayer.split(":")[0], "")
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subLayer.replace(path, "")
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# remove any : or " left over
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if subLayer.startswith(":"):
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subLayer = subLayer[1:]
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if subLayer.startswith("\""):
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subLayer = subLayer[1:]
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if subLayer.endswith(":"):
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subLayer = subLayer[:-1]
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if subLayer.endswith("\""):
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subLayer = subLayer[:-1]
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ld = QgsSublayersDialog.LayerDefinition()
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ld.layerId = subLayerNum
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ld.layerName = subLayer
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layers.append(ld)
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subLayerNum = subLayerNum + 1
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# Use QgsSublayersDialog
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# Would be good if QgsSublayersDialog had an option to allow only one sublayer to be selected
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chooseSublayersDialog = QgsSublayersDialog(QgsSublayersDialog.Gdal, "gdal")
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chooseSublayersDialog.populateLayerTable(layers)
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if chooseSublayersDialog.exec_():
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return layer.subLayers()[chooseSublayersDialog.selectionIndexes()[0]]
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else:
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# If user pressed cancel then just return the input path
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return path
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else:
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# If the sublayers selection dialog is not to be shown then just return the input path
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return path
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except:
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# If the layer is not a raster layer, then just return the input path
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return path
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def vectorDataType(obj):
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types = ''
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for t in obj.datatype:
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if t == dataobjects.TYPE_VECTOR_POINT:
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types += 'point, '
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elif t == dataobjects.TYPE_VECTOR_LINE:
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types += 'line, '
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elif t == dataobjects.TYPE_VECTOR_POLYGON:
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types += 'polygon, '
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else:
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types += 'any, '
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return types[:-2]
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