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96 lines
3.7 KiB
Python
96 lines
3.7 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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OutputVector.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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from PyQt4.QtCore import *
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from qgis.core import *
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from processing.core.VectorWriter import VectorWriter
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from processing.outputs.Output import Output
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from processing.tools.system import *
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from processing.tools import dataobjects
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class OutputVector(Output):
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encoding = None
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compatible = None
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def getFileFilter(self, alg):
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exts = dataobjects.getSupportedOutputVectorLayerExtensions()
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for i in range(len(exts)):
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exts[i] = exts[i].upper() + ' files(*.' + exts[i].lower() + ')'
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return ';;'.join(exts)
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def getDefaultFileExtension(self, alg):
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return alg.provider.getSupportedOutputVectorLayerExtensions()[0]
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def getCompatibleFileName(self, alg):
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"""Returns a filename that is compatible with the algorithm
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that is going to generate this output.
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If the algorithm supports the file format of the current
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output value, it returns that value. If not, it returns a
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temporary file with a supported file format, to be used to
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generate the output result.
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"""
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ext = self.value[self.value.rfind('.') + 1:]
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if ext in alg.provider.getSupportedOutputVectorLayerExtensions():
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return self.value
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else:
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if self.compatible is None:
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self.compatible = getTempFilenameInTempFolder(self.name + '.'
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+ self.getDefaultFileExtension(alg))
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return self.compatible
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def getVectorWriter(self, fields, geomType, crs, options=None):
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"""Returns a suitable writer to which features can be added as
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a result of the algorithm. Use this to transparently handle
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output values instead of creating your own method.
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Executing this method might modify the object, adding additional
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information to it, so the writer can be later accessed and
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processed within QGIS. It should be called just once, since a
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new call might result in previous data being replaced, thus
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rendering a previously obtained writer useless.
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@param fields a list of QgsField
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@param geomType a suitable geometry type, as it would be passed
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to a QgsVectorFileWriter constructor
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@param crs the crs of the layer to create
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@return writer instance of the vector writer class
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"""
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if self.encoding is None:
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settings = QSettings()
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self.encoding = settings.value('/Processing/encoding', 'System', type=str)
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w = VectorWriter(self.value, self.encoding, fields, geomType,
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crs, options)
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self.memoryLayer = w.memLayer
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return w
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