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441 lines
16 KiB
Python
441 lines
16 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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__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 QGis, QgsProject, QgsVectorFileWriter, QgsMapLayer, QgsRasterLayer, QgsVectorLayer, QgsMapLayerRegistry, QgsCoordinateReferenceSystem
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from qgis.gui import QgsSublayersDialog
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from PyQt4.QtCore import QSettings
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from qgis.utils import iface
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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, getTempFilename, isWindows
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ALL_TYPES = [-1]
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_loadedLayers = {}
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def resetLoadedLayers():
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global _loadedLayers
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_loadedLayers = {}
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def getSupportedOutputVectorLayerExtensions():
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formats = QgsVectorFileWriter.supportedFiltersAndFormats()
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exts = ['shp'] # shp is the default, should be the first
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for extension in formats.keys():
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extension = unicode(extension)
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extension = extension[extension.find('*.') + 2:]
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extension = extension[:extension.find(' ')]
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if extension.lower() != 'shp':
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exts.append(extension)
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return exts
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def getSupportedOutputRasterLayerExtensions():
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allexts = ['tif']
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for exts in GdalUtils.getSupportedRasters().values():
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for ext in exts:
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if ext not in allexts:
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allexts.append(ext)
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return allexts
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def getSupportedOutputTableExtensions():
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exts = ['csv']
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return exts
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def getRasterLayers(sorting=True):
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layers = QgsProject.instance().layerTreeRoot().findLayers()
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raster = []
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for layer in layers:
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mapLayer = layer.layer()
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if mapLayer.type() == QgsMapLayer.RasterLayer:
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if mapLayer.providerType() == 'gdal': # only gdal file-based layers
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raster.append(mapLayer)
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if sorting:
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return sorted(raster, key=lambda layer: layer.name().lower())
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else:
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return raster
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def getVectorLayers(shapetype=[-1], sorting=True):
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layers = QgsProject.instance().layerTreeRoot().findLayers()
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vector = []
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for layer in layers:
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mapLayer = layer.layer()
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if mapLayer.type() == QgsMapLayer.VectorLayer and mapLayer.dataProvider().name() != "grass":
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if (mapLayer.hasGeometryType() and
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(shapetype == ALL_TYPES or mapLayer.geometryType() in shapetype)):
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vector.append(mapLayer)
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if sorting:
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return sorted(vector, key=lambda layer: layer.name().lower())
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else:
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return vector
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def getAllLayers():
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layers = []
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layers += getRasterLayers()
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layers += getVectorLayers()
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return sorted(layers, key=lambda layer: layer.name().lower())
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def getTables(sorting=True):
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layers = QgsProject.instance().layerTreeRoot().findLayers()
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tables = []
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for layer in layers:
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mapLayer = layer.layer()
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if mapLayer.type() == QgsMapLayer.VectorLayer:
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tables.append(mapLayer)
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if sorting:
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return sorted(tables, key=lambda table: table.name().lower())
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else:
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return tables
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def extent(layers):
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first = True
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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 = getObjectFromUri(layer)
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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 unicode(xmin) + ',' + unicode(xmax) + ',' + unicode(ymin) + ',' + unicode(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 = QSettings()
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if crs is not None:
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prjSetting = settings.value('/Projections/defaultBehaviour')
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settings.setValue('/Projections/defaultBehaviour', '')
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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() == QGis.Point:
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style = ProcessingConfig.getSetting(ProcessingConfig.VECTOR_POINT_STYLE)
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elif qgslayer.geometryType() == QGis.Line:
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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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QgsMapLayerRegistry.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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QgsMapLayerRegistry.instance().addMapLayers([qgslayer])
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iface.legendInterface().refreshLayerSymbology(qgslayer)
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else:
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if prjSetting:
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settings.setValue('/Projections/defaultBehaviour', prjSetting)
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raise RuntimeError('Could not load layer: ' + unicode(fileName)
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+ '\nCheck the procesing framework log to look for errors')
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if prjSetting:
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settings.setValue('/Projections/defaultBehaviour', prjSetting)
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return qgslayer
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def getObjectFromName(name):
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layers = getAllLayers()
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for layer in layers:
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if layer.name() == name:
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return layer
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def getObject(uriorname):
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ret = getObjectFromName(uriorname)
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if ret is None:
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ret = getObjectFromUri(uriorname)
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return ret
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def normalizeLayerSource(source):
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if isWindows():
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source = source.replace('\\', '/')
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source = source.replace('"', "'")
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return source
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def getObjectFromUri(uri, forceLoad=True):
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"""Returns an object (layer/table) given a source definition.
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if forceLoad is true, it tries to load it if it is not currently open
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Otherwise, it will return the object only if it is loaded in QGIS.
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"""
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if uri is None:
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return None
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if uri in _loadedLayers:
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return _loadedLayers[uri]
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layers = getRasterLayers()
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for layer in layers:
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if normalizeLayerSource(layer.source()) == normalizeLayerSource(uri):
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return layer
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layers = getVectorLayers()
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for layer in layers:
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if normalizeLayerSource(layer.source()) == normalizeLayerSource(uri):
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return layer
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tables = getTables()
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for table in tables:
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if normalizeLayerSource(table.source()) == normalizeLayerSource(uri):
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return table
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if forceLoad:
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settings = QSettings()
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prjSetting = settings.value('/Projections/defaultBehaviour')
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settings.setValue('/Projections/defaultBehaviour', '')
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# If is not opened, we open it
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layer = QgsVectorLayer(uri, uri, 'ogr')
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if layer.isValid():
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if prjSetting:
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settings.setValue('/Projections/defaultBehaviour', prjSetting)
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_loadedLayers[normalizeLayerSource(layer.source())] = layer
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return layer
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layer = QgsVectorLayer(uri, uri, 'postgres')
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if layer.isValid():
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if prjSetting:
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settings.setValue('/Projections/defaultBehaviour', prjSetting)
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_loadedLayers[normalizeLayerSource(layer.source())] = layer
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return layer
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layer = QgsRasterLayer(uri, uri)
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if layer.isValid():
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if prjSetting:
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settings.setValue('/Projections/defaultBehaviour', prjSetting)
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_loadedLayers[normalizeLayerSource(layer.source())] = layer
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return layer
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if prjSetting:
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settings.setValue('/Projections/defaultBehaviour', prjSetting)
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else:
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return None
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def exportVectorLayer(layer):
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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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settings = QSettings()
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systemEncoding = settings.value('/UI/encoding', 'System')
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filename = os.path.basename(unicode(layer.source()))
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idx = filename.rfind('.')
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if idx != -1:
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filename = filename[:idx]
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filename = unicode(layer.name())
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validChars = \
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'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789:'
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filename = ''.join(c for c in filename if c in validChars)
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if len(filename) == 0:
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filename = 'layer'
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output = getTempFilenameInTempFolder(filename + '.shp')
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provider = layer.dataProvider()
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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.pendingFields(),
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provider.geometryType(), 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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isASCII = True
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try:
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unicode(layer.source()).decode('ascii')
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except UnicodeEncodeError:
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isASCII = False
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if not unicode(layer.source()).endswith('shp') or not isASCII:
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writer = QgsVectorFileWriter(
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output, systemEncoding,
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layer.pendingFields(), provider.geometryType(),
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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 unicode(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 unicode(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 = QSettings()
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systemEncoding = settings.value('/UI/encoding', 'System')
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output = getTempFilename()
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provider = table.dataProvider()
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isASCII = True
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try:
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unicode(table.source()).decode('ascii')
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except UnicodeEncodeError:
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isASCII = False
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isDbf = unicode(table.source()).endswith('dbf') \
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or unicode(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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provider.fields(), QGis.WKBNoGeometry,
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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 = unicode(table.source())
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if unicode(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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layers.append(unicode(subLayerNum) + "|" + subLayer)
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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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