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311 lines
11 KiB
Python
311 lines
11 KiB
Python
"""
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***************************************************************************
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Output.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 sys
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from PyQt4.QtCore import QCoreApplication, QSettings
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from processing.tools.system import isWindows, getTempFilenameInTempFolder
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from processing.tools.vector import VectorWriter, TableWriter
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from processing.tools import dataobjects
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from processing.core.ProcessingConfig import ProcessingConfig
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def getOutputFromString(s):
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tokens = s.split("|")
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params = [t if unicode(t) != "None" else None for t in tokens[1:]]
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clazz = getattr(sys.modules[__name__], tokens[0])
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return clazz(*params)
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class Output(object):
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def __init__(self, name='', description='', hidden=False):
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self.name = name
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self.description = description
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# The value of an output is a string representing the location
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# of the output. For a file based output, it should be the
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# filepath to it.
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self.value = None
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# A hidden output will not be shown to the user, who will not
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# be able to select where to store it. Use this to generate
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# outputs that are modified version of inputs (like a selection
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# in a vector layer). In the case of layers, hidden outputs are
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# not loaded into QGIS after the algorithm is executed. Other
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# outputs not representing layers or tables should always be hidden.
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self.hidden = unicode(hidden).lower() == unicode(True).lower()
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# This value indicates whether the output has to be opened
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# after being produced by the algorithm or not
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self.open = True
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def __str__(self):
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return u'{} <{}>'.format(self.name, self.__class__.__name__)
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def getValueAsCommandLineParameter(self):
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if self.value is None:
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return unicode(None)
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else:
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if not isWindows():
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return '"' + unicode(self.value) + '"'
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else:
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return '"' + unicode(self.value).replace('\\', '\\\\') + '"'
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def setValue(self, value):
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try:
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if value is not None and isinstance(value, basestring):
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value = value.strip()
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self.value = value
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return True
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except:
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return False
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def typeName(self):
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return self.__class__.__name__.replace('Output', '').lower()
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def tr(self, string, context=''):
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if context == '':
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context = 'Output'
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return QCoreApplication.translate(context, string)
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class OutputDirectory(Output):
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directory = True
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class OutputExtent(Output):
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def __init__(self, name='', description=''):
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self.name = name
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self.description = description
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self.value = None
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self.hidden = True
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def setValue(self, value):
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try:
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if value is not None and isinstance(value, basestring):
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value = value.strip()
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else:
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self.value = ','.join([unicode(v) for v in value])
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return True
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except:
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return False
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class OutputFile(Output):
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def __init__(self, name='', description='', ext=None):
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Output.__init__(self, name, description)
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self.ext = ext
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def getFileFilter(self, alg):
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if self.ext is None:
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return self.tr('All files(*.*)', 'OutputFile')
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else:
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return self.tr('%s files(*.%s)', 'OutputFile') % (self.ext, self.ext)
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def getDefaultFileExtension(self, alg):
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return self.ext or 'file'
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class OutputHTML(Output):
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def getFileFilter(self, alg):
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return self.tr('HTML files(*.html)', 'OutputHTML')
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def getDefaultFileExtension(self, alg):
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return 'html'
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class OutputNumber(Output):
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def __init__(self, name='', description=''):
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self.name = name
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self.description = description
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self.value = None
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self.hidden = True
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class OutputRaster(Output):
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compatible = None
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def getFileFilter(self, alg):
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exts = dataobjects.getSupportedOutputRasterLayerExtensions()
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for i in range(len(exts)):
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exts[i] = self.tr('%s files (*.%s)', 'OutputVector') % (exts[i].upper(), exts[i].lower())
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return ';;'.join(exts)
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def getDefaultFileExtension(self, alg):
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supported = alg.provider.getSupportedOutputRasterLayerExtensions()
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default = ProcessingConfig.getSetting(ProcessingConfig.DEFAULT_OUTPUT_RASTER_LAYER_EXT)
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ext = default if default in supported else supported[0]
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return ext
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def getCompatibleFileName(self, alg):
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"""
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Returns a filename that is compatible with the algorithm
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that is going to generate this output. If the algorithm
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supports the file format of the current output value, it
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returns that value. If not, it returns a temporary file with
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a supported file format, to be used to generate the output
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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.getSupportedOutputRasterLayerExtensions():
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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(
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self.name + '.' + self.getDefaultFileExtension(alg))
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return self.compatible
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class OutputString(Output):
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def __init__(self, name='', description=''):
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self.name = name
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self.description = description
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self.value = None
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self.hidden = True
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class OutputTable(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 = ['csv']
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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.getSupportedOutputTableExtensions()[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.getSupportedOutputTableExtensions():
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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(
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self.name + '.' + self.getDefaultFileExtension(alg))
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return self.compatible
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def getTableWriter(self, fields):
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"""
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Returns a suitable writer to which records can be added as a
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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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@param fields a list of field titles
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@return writer instance of the table 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')
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return TableWriter(self.value, self.encoding, fields)
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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] = self.tr('%s files (*.%s)', 'OutputVector') % (exts[i].upper(), exts[i].lower())
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return ';;'.join(exts)
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def getDefaultFileExtension(self, alg):
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supported = alg.provider.getSupportedOutputVectorLayerExtensions()
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default = ProcessingConfig.getSetting(ProcessingConfig.DEFAULT_OUTPUT_VECTOR_LAYER_EXT)
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ext = default if default in supported else supported[0]
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return ext
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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(
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self.name + '.' + 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', str)
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w = VectorWriter(self.value, self.encoding, fields, geomType,
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crs, options)
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self.layer = w.layer
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return w
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