# -*- 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. *
* *
***************************************************************************
"""
__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 QGis, QgsProject, QgsVectorFileWriter, QgsMapLayer, QgsRasterLayer, QgsVectorLayer, QgsMapLayerRegistry, QgsCoordinateReferenceSystem
from qgis.gui import QgsSublayersDialog
from PyQt4.QtCore import QSettings
from qgis.utils import iface
from processing.core.ProcessingConfig import ProcessingConfig
from processing.algs.gdal.GdalUtils import GdalUtils
from processing.tools.system import getTempFilenameInTempFolder, getTempFilename, isWindows
ALL_TYPES = [-1]
_loadedLayers = {}
def resetLoadedLayers():
global _loadedLayers
_loadedLayers = {}
def getSupportedOutputVectorLayerExtensions():
formats = QgsVectorFileWriter.supportedFiltersAndFormats()
exts = ['shp'] # shp is the default, should be the first
for extension in formats.keys():
extension = unicode(extension)
extension = extension[extension.find('*.') + 2:]
extension = extension[:extension.find(' ')]
if extension.lower() != 'shp':
exts.append(extension)
return exts
def getSupportedOutputRasterLayerExtensions():
allexts = ['tif']
for exts in GdalUtils.getSupportedRasters().values():
for ext in exts:
if ext not in allexts:
allexts.append(ext)
return allexts
def getSupportedOutputTableExtensions():
exts = ['csv']
return exts
def getRasterLayers(sorting=True):
layers = QgsProject.instance().layerTreeRoot().findLayers()
raster = [lay.layer() for lay in layers if lay.layer() is not None and canUseRasterLayer(lay.layer())]
if sorting:
return sorted(raster, key=lambda layer: layer.name().lower())
else:
return raster
def getVectorLayers(shapetype=[-1], sorting=True):
layers = QgsProject.instance().layerTreeRoot().findLayers()
vector = [lay.layer() for lay in layers if canUseVectorLayer(lay.layer(), shapetype)]
if sorting:
return sorted(vector, key=lambda layer: layer.name().lower())
else:
return vector
def canUseVectorLayer(layer, shapetype):
if layer.type() == QgsMapLayer.VectorLayer and layer.dataProvider().name() != "grass":
if (layer.hasGeometryType() and
(shapetype == ALL_TYPES or layer.geometryType() in shapetype)):
return True
return False
def canUseRasterLayer(layer):
if layer.type() == QgsMapLayer.RasterLayer:
if layer.providerType() == 'gdal': # only gdal file-based layers
return True
return False
def getAllLayers():
layers = []
layers += getRasterLayers()
layers += getVectorLayers()
return sorted(layers, key=lambda layer: layer.name().lower())
def getTables(sorting=True):
layers = QgsProject.instance().layerTreeRoot().findLayers()
tables = []
for layer in layers:
mapLayer = layer.layer()
if mapLayer.type() == QgsMapLayer.VectorLayer:
tables.append(mapLayer)
if sorting:
return sorted(tables, key=lambda table: table.name().lower())
else:
return tables
def extent(layers):
first = True
for layer in layers:
if not isinstance(layer, (QgsMapLayer.QgsRasterLayer, QgsMapLayer.QgsVectorLayer)):
layer = getObjectFromUri(layer)
if layer is None:
continue
if first:
xmin = layer.extent().xMinimum()
xmax = layer.extent().xMaximum()
ymin = layer.extent().yMinimum()
ymax = layer.extent().yMaximum()
else:
xmin = min(xmin, layer.extent().xMinimum())
xmax = max(xmax, layer.extent().xMaximum())
ymin = min(ymin, layer.extent().yMinimum())
ymax = max(ymax, layer.extent().yMaximum())
first = False
if first:
return '0,0,0,0'
else:
return unicode(xmin) + ',' + unicode(xmax) + ',' + unicode(ymin) + ',' + unicode(ymax)
def loadList(layers):
for layer in layers:
load(layer)
def load(fileName, name=None, crs=None, style=None):
"""Loads a layer/table into the current project, given its file.
"""
if fileName is None:
return
prjSetting = None
settings = QSettings()
if crs is not None:
prjSetting = settings.value('/Projections/defaultBehaviour')
settings.setValue('/Projections/defaultBehaviour', '')
if name is None:
name = os.path.split(fileName)[1]
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() == QGis.Point:
style = ProcessingConfig.getSetting(ProcessingConfig.VECTOR_POINT_STYLE)
elif qgslayer.geometryType() == QGis.Line:
style = ProcessingConfig.getSetting(ProcessingConfig.VECTOR_LINE_STYLE)
else:
style = ProcessingConfig.getSetting(ProcessingConfig.VECTOR_POLYGON_STYLE)
qgslayer.loadNamedStyle(style)
QgsMapLayerRegistry.instance().addMapLayers([qgslayer])
else:
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)
QgsMapLayerRegistry.instance().addMapLayers([qgslayer])
iface.legendInterface().refreshLayerSymbology(qgslayer)
else:
if prjSetting:
settings.setValue('/Projections/defaultBehaviour', prjSetting)
raise RuntimeError('Could not load layer: ' + unicode(fileName)
+ '\nCheck the procesing framework log to look for errors')
if prjSetting:
settings.setValue('/Projections/defaultBehaviour', prjSetting)
return qgslayer
def getObjectFromName(name):
layers = getAllLayers()
for layer in layers:
if layer.name() == name:
return layer
def getObject(uriorname):
ret = getObjectFromName(uriorname)
if ret is None:
ret = getObjectFromUri(uriorname)
return ret
def normalizeLayerSource(source):
if isWindows():
source = source.replace('\\', '/')
source = source.replace('"', "'")
return source
def getObjectFromUri(uri, forceLoad=True):
"""Returns an object (layer/table) given a source definition.
if forceLoad is true, it tries to load it if it is not currently open
Otherwise, it will return the object only if it is loaded in QGIS.
"""
if uri is None:
return None
if uri in _loadedLayers:
return _loadedLayers[uri]
layers = getRasterLayers()
for layer in layers:
if normalizeLayerSource(layer.source()) == normalizeLayerSource(uri):
return layer
layers = getVectorLayers()
for layer in layers:
if normalizeLayerSource(layer.source()) == normalizeLayerSource(uri):
return layer
tables = getTables()
for table in tables:
if normalizeLayerSource(table.source()) == normalizeLayerSource(uri):
return table
if forceLoad:
settings = QSettings()
prjSetting = settings.value('/Projections/defaultBehaviour')
settings.setValue('/Projections/defaultBehaviour', '')
# If is not opened, we open it
for provider in ['ogr', 'postgres', 'spatialite', 'virtual']:
layer = QgsVectorLayer(uri, uri, provider)
if layer.isValid():
if prjSetting:
settings.setValue('/Projections/defaultBehaviour', prjSetting)
_loadedLayers[normalizeLayerSource(layer.source())] = layer
return layer
layer = QgsRasterLayer(uri, uri)
if layer.isValid():
if prjSetting:
settings.setValue('/Projections/defaultBehaviour', prjSetting)
_loadedLayers[normalizeLayerSource(layer.source())] = layer
return layer
if prjSetting:
settings.setValue('/Projections/defaultBehaviour', prjSetting)
else:
return None
def exportVectorLayer(layer):
"""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.
"""
settings = QSettings()
systemEncoding = settings.value('/UI/encoding', 'System')
filename = os.path.basename(unicode(layer.source()))
idx = filename.rfind('.')
if idx != -1:
filename = filename[:idx]
filename = unicode(layer.name())
validChars = \
'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789:'
filename = ''.join(c for c in filename if c in validChars)
if len(filename) == 0:
filename = 'layer'
output = getTempFilenameInTempFolder(filename + '.shp')
provider = layer.dataProvider()
useSelection = ProcessingConfig.getSetting(ProcessingConfig.USE_SELECTED)
if useSelection and layer.selectedFeatureCount() != 0:
writer = QgsVectorFileWriter(output, systemEncoding,
layer.pendingFields(),
provider.geometryType(), layer.crs())
selection = layer.selectedFeatures()
for feat in selection:
writer.addFeature(feat)
del writer
return output
else:
isASCII = True
try:
unicode(layer.source()).decode('ascii')
except UnicodeEncodeError:
isASCII = False
if not unicode(layer.source()).endswith('shp') or not isASCII:
writer = QgsVectorFileWriter(
output, systemEncoding,
layer.pendingFields(), provider.geometryType(),
layer.crs()
)
for feat in layer.getFeatures():
writer.addFeature(feat)
del writer
return output
else:
return unicode(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 unicode(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 = QSettings()
systemEncoding = settings.value('/UI/encoding', 'System')
output = getTempFilename()
provider = table.dataProvider()
isASCII = True
try:
unicode(table.source()).decode('ascii')
except UnicodeEncodeError:
isASCII = False
isDbf = unicode(table.source()).endswith('dbf') \
or unicode(table.source()).endswith('shp')
if not isDbf or not isASCII:
writer = QgsVectorFileWriter(output, systemEncoding,
provider.fields(), QGis.WKBNoGeometry,
QgsCoordinateReferenceSystem('4326'))
for feat in table.getFeatures():
writer.addFeature(feat)
del writer
return output + '.dbf'
else:
filename = unicode(table.source())
if unicode(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]
layers.append(unicode(subLayerNum) + "|" + subLayer)
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