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# -*- coding: utf-8 -*-
"""
***************************************************************************
ParameterVector.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
from qgis.core import *
from processing.parameters.ParameterDataObject import ParameterDataObject
from processing.tools import dataobjects
class ParameterVector(ParameterDataObject):
VECTOR_TYPE_POINT = 0
VECTOR_TYPE_LINE = 1
VECTOR_TYPE_POLYGON = 2
VECTOR_TYPE_ANY = -1
def __init__(self, name='', description='', shapetype=[-1],
optional=False):
ParameterDataObject.__init__(self, name, description)
self.optional = optional
if isinstance(shapetype, int):
shapetype = [shapetype]
self.shapetype = shapetype
self.value = None
self.exported = None
def setValue(self, obj):
self.exported = None
if obj is None:
if self.optional:
self.value = None
return True
else:
return False
if isinstance(obj, QgsVectorLayer):
self.value = unicode(obj.source())
return True
else:
self.value = unicode(obj)
layers = dataobjects.getVectorLayers(self.shapetype)
for layer in layers:
if layer.name() == self.value or layer.source() == self.value:
self.value = unicode(layer.source())
return True
return os.path.exists(self.value)
def getSafeExportedLayer(self):
"""Returns not the value entered by the user, but a string with
a filename which contains the data of this layer, but saved in
a standard format (currently always a shapefile) so that it can
be opened by most external applications.
If there is a selection and QGIS is configured to use just the
selection, if exports the layer even if it is already in a
suitable format.
Works only if the layer represented by the parameter value is
currently loaded in QGIS. Otherwise, it will not perform any
export and return the current value string.
If the current value represents a layer in a suitable format,
it does not export at all and returns that value.
The layer is exported just the first time the method is called.
The method can be called several times and it will always
return the same file, performing the export only the first
time.
"""
if self.exported:
return self.exported
layer = dataobjects.getObjectFromUri(self.value, False)
if layer:
self.exported = dataobjects.exportVectorLayer(layer)
else:
self.exported = self.value
return self.exported
def getFileFilter(self):
exts = dataobjects.getSupportedOutputVectorLayerExtensions()
for i in range(len(exts)):
exts[i] = exts[i].upper() + ' files(*.' + exts[i].lower() + ')'
return ';;'.join(exts)
def serialize(self):
return self.__module__.split('.')[-1] + '|' + self.name + '|' \
+ self.description + '|' + ','.join(str(t) for t in
self.shapetype) + '|' + str(self.optional)
def deserialize(self, s):
tokens = s.split('|')
return ParameterVector(tokens[1], tokens[2], [int(t) for t in
tokens[3].split(',')], str(True) == tokens[4])
def getAsScriptCode(self):
return '##' + self.name + '=vector'
|
