# -*- coding: utf-8 -*- """ *************************************************************************** dataobject.py --------------------- Date : August 2012 Copyright : (C) 2012 by Victor Olaya Email : volayaf 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. * * * *************************************************************************** """ from builtins import str __author__ = 'Victor Olaya' __date__ = 'August 2012' __copyright__ = '(C) 2012, Victor Olaya' # This will get replaced with a git SHA1 when you do a git archive __revision__ = '$Format:%H$' import os import re from qgis.core import (QgsVectorFileWriter, QgsMapLayer, QgsRasterLayer, QgsWkbTypes, QgsVectorLayer, QgsProject, QgsCoordinateReferenceSystem, QgsSettings, QgsProcessingUtils, QgsProcessingContext, QgsFeatureRequest, QgsExpressionContext, QgsExpressionContextUtils, QgsExpressionContextScope) from qgis.gui import QgsSublayersDialog from qgis.PyQt.QtCore import QCoreApplication from qgis.utils import iface from processing.core.ProcessingConfig import ProcessingConfig from processing.algs.gdal.GdalUtils import GdalUtils from processing.tools.system import (getTempFilename, removeInvalidChars) ALL_TYPES = [-1] TYPE_VECTOR_ANY = -1 TYPE_VECTOR_POINT = 0 TYPE_VECTOR_LINE = 1 TYPE_VECTOR_POLYGON = 2 TYPE_RASTER = 3 TYPE_FILE = 4 TYPE_TABLE = 5 def createContext(feedback=None): """ Creates a default processing context """ context = QgsProcessingContext() context.setProject(QgsProject.instance()) context.setFeedback(feedback) invalid_features_method = ProcessingConfig.getSetting(ProcessingConfig.FILTER_INVALID_GEOMETRIES) if invalid_features_method is None: invalid_features_method = QgsFeatureRequest.GeometryAbortOnInvalid context.setInvalidGeometryCheck(invalid_features_method) settings = QgsSettings() context.setDefaultEncoding(settings.value("/Processing/encoding", "System")) context.setExpressionContext(createExpressionContext()) return context def createExpressionContext(): context = QgsExpressionContext() context.appendScope(QgsExpressionContextUtils.globalScope()) context.appendScope(QgsExpressionContextUtils.projectScope(QgsProject.instance())) if iface and iface.mapCanvas(): context.appendScope(QgsExpressionContextUtils.mapSettingsScope(iface.mapCanvas().mapSettings())) processingScope = QgsExpressionContextScope() if iface and iface.mapCanvas(): extent = iface.mapCanvas().fullExtent() processingScope.setVariable('fullextent_minx', extent.xMinimum()) processingScope.setVariable('fullextent_miny', extent.yMinimum()) processingScope.setVariable('fullextent_maxx', extent.xMaximum()) processingScope.setVariable('fullextent_maxy', extent.yMaximum()) context.appendScope(processingScope) return context def getSupportedOutputRasterLayerExtensions(): allexts = [] for exts in list(GdalUtils.getSupportedRasters().values()): for ext in exts: if ext != 'tif' and ext not in allexts: allexts.append(ext) allexts.sort() allexts.insert(0, 'tif') # tif is the default, should be the first return allexts def load(fileName, name=None, crs=None, style=None, isRaster=False): """Loads a layer/table into the current project, given its file. """ if fileName is None: return prjSetting = None settings = QgsSettings() if crs is not None: prjSetting = settings.value('/Projections/defaultBehavior') settings.setValue('/Projections/defaultBehavior', '') if name is None: name = os.path.split(fileName)[1] if isRaster: qgslayer = QgsRasterLayer(fileName, name) if qgslayer.isValid(): if crs is not None and qgslayer.crs() is None: qgslayer.setCrs(crs, False) if style is None: style = ProcessingConfig.getSetting(ProcessingConfig.RASTER_STYLE) qgslayer.loadNamedStyle(style) QgsProject.instance().addMapLayers([qgslayer]) else: if prjSetting: settings.setValue('/Projections/defaultBehavior', prjSetting) raise RuntimeError('Could not load layer: ' + str(fileName) + '\nCheck the processing framework log to look for errors') else: qgslayer = QgsVectorLayer(fileName, name, 'ogr') if qgslayer.isValid(): if crs is not None and qgslayer.crs() is None: qgslayer.setCrs(crs, False) if style is None: if qgslayer.geometryType() == QgsWkbTypes.PointGeometry: style = ProcessingConfig.getSetting(ProcessingConfig.VECTOR_POINT_STYLE) elif qgslayer.geometryType() == QgsWkbTypes.LineGeometry: style = ProcessingConfig.getSetting(ProcessingConfig.VECTOR_LINE_STYLE) else: style = ProcessingConfig.getSetting(ProcessingConfig.VECTOR_POLYGON_STYLE) qgslayer.loadNamedStyle(style) QgsProject.instance().addMapLayers([qgslayer]) if prjSetting: settings.setValue('/Projections/defaultBehavior', prjSetting) return qgslayer def exportVectorLayer(layer, supported=None): """Takes a QgsVectorLayer and returns the filename to refer to it, which allows external apps which support only file-based layers to use it. It performs the necessary export in case the input layer is not in a standard format suitable for most applications, it is a remote one or db-based (non-file based) one, or if there is a selection and it should be used, exporting just the selected features. Currently, the output is restricted to shapefiles, so anything that is not in a shapefile will get exported. It also export to a new file if the original one contains non-ascii characters. """ supported = supported or ["shp"] settings = QgsSettings() systemEncoding = settings.value('/UI/encoding', 'System') output = getTempFilename('shp') basename = removeInvalidChars(os.path.basename(layer.source())) if basename: if not basename.endswith("shp"): basename = os.path.splitext(basename)[0] + ".shp" output = QgsProcessingUtils.generateTempFilename(basename) else: output = getTempFilename("shp") useSelection = False # TODO ProcessingConfig.getSetting(ProcessingConfig.USE_SELECTED) if useSelection and layer.selectedFeatureCount() != 0: writer = QgsVectorFileWriter(output, systemEncoding, layer.fields(), layer.wkbType(), layer.crs()) selection = layer.selectedFeatures() for feat in selection: writer.addFeature(feat, QgsFeatureSink.FastInsert) del writer return output else: if not os.path.splitext(layer.source())[1].lower() in supported: writer = QgsVectorFileWriter( output, systemEncoding, layer.fields(), layer.wkbType(), layer.crs() ) for feat in layer.getFeatures(): writer.addFeature(feat, QgsFeatureSink.FastInsert) del writer return output else: return layer.source() def exportRasterLayer(layer): """Takes a QgsRasterLayer and returns the filename to refer to it, which allows external apps which support only file-based layers to use it. It performs the necessary export in case the input layer is not in a standard format suitable for most applications, it is a remote one or db-based (non-file based) one. Currently, the output is restricted to geotiff, but not all other formats are exported. Only those formats not supported by GDAL are exported, so it is assumed that the external app uses GDAL to read the layer. """ # TODO: Do the conversion here return str(layer.source()) def exportTable(table): """Takes a QgsVectorLayer and returns the filename to refer to its attributes table, which allows external apps which support only file-based layers to use it. It performs the necessary export in case the input layer is not in a standard format suitable for most applications, it isa remote one or db-based (non-file based) one. Currently, the output is restricted to DBF. It also export to a new file if the original one contains non-ascii characters. """ settings = QgsSettings() systemEncoding = settings.value('/UI/encoding', 'System') output = getTempFilename() isASCII = True try: str(table.source()).decode('ascii') except UnicodeEncodeError: isASCII = False isDbf = str(table.source()).endswith('dbf') \ or str(table.source()).endswith('shp') if not isDbf or not isASCII: writer = QgsVectorFileWriter(output, systemEncoding, table.fields(), QgsWkbTypes.NullGeometry, QgsCoordinateReferenceSystem('4326')) for feat in table.getFeatures(): writer.addFeature(feat, QgsFeatureSink.FastInsert) del writer return output + '.dbf' else: filename = str(table.source()) if str(table.source()).endswith('shp'): return filename[:-3] + 'dbf' else: return filename def getRasterSublayer(path, param): layer = QgsRasterLayer(path) try: # If the layer is a raster layer and has multiple sublayers, let the user chose one. # Based on QgisApp::askUserForGDALSublayers if layer and param.showSublayersDialog and layer.dataProvider().name() == "gdal" and len(layer.subLayers()) > 1: layers = [] subLayerNum = 0 # simplify raster sublayer name for subLayer in layer.subLayers(): # if netcdf/hdf use all text after filename if bool(re.match('netcdf', subLayer, re.I)) or bool(re.match('hdf', subLayer, re.I)): subLayer = subLayer.split(path)[1] subLayer = subLayer[1:] else: # remove driver name and file name subLayer.replace(subLayer.split(":")[0], "") subLayer.replace(path, "") # remove any : or " left over if subLayer.startswith(":"): subLayer = subLayer[1:] if subLayer.startswith("\""): subLayer = subLayer[1:] if subLayer.endswith(":"): subLayer = subLayer[:-1] if subLayer.endswith("\""): subLayer = subLayer[:-1] ld = QgsSublayersDialog.LayerDefinition() ld.layerId = subLayerNum ld.layerName = subLayer layers.append(ld) subLayerNum = subLayerNum + 1 # Use QgsSublayersDialog # Would be good if QgsSublayersDialog had an option to allow only one sublayer to be selected chooseSublayersDialog = QgsSublayersDialog(QgsSublayersDialog.Gdal, "gdal") chooseSublayersDialog.populateLayerTable(layers) if chooseSublayersDialog.exec_(): return layer.subLayers()[chooseSublayersDialog.selectionIndexes()[0]] else: # If user pressed cancel then just return the input path return path else: # If the sublayers selection dialog is not to be shown then just return the input path return path except: # If the layer is not a raster layer, then just return the input path return path def vectorDataType(obj): types = '' for t in obj.datatype: if t == dataobjects.TYPE_VECTOR_POINT: types += 'point, ' elif t == dataobjects.TYPE_VECTOR_LINE: types += 'line, ' elif t == dataobjects.TYPE_VECTOR_POLYGON: types += 'polygon, ' else: types += 'any, ' return types[:-2]