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68 lines
3.2 KiB
Python
68 lines
3.2 KiB
Python
from sextante.core.SextanteConfig import SextanteConfig
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from sextante.core.SextanteUtils import SextanteUtils
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from qgis.core import *
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from PyQt4.QtCore import *
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from PyQt4.QtGui import *
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from sextante.gdal.GdalUtils import GdalUtils
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class LayerExporter():
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'''This class provides method to export layers so they can be used by third party applications.
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These method are used by the GeoAlgorithm class and allow the developer to use transparently
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any layer that is loaded into QGIS, without having to worry about its origin'''
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@staticmethod
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def exportVectorLayer(layer):
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'''Takes a QgsVectorLayer and returns the filename to refer to it, which allows external
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apps which support only file-based layers to use it. It performs the necessary export
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in case the input layer 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 selection and it should be
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used, exporting just the selected features.
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Currently, the output is restricted to shapefiles, so anything that is not in a shapefile
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will get exported'''
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settings = QSettings()
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systemEncoding = settings.value( "/UI/encoding", "System" ).toString()
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output = SextanteUtils.getTempFilename("shp")
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provider = layer.dataProvider()
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allAttrs = provider.attributeIndexes()
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provider.select( allAttrs )
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useSelection = SextanteConfig.getSetting(SextanteConfig.USE_SELECTED)
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if useSelection and layer.selectedFeatureCount() != 0:
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writer = QgsVectorFileWriter( output, systemEncoding,provider.fields(), provider.geometryType(), provider.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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if (not unicode(layer.source()).endswith("shp")):
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writer = QgsVectorFileWriter( output, systemEncoding,provider.fields(), provider.geometryType(), provider.crs() )
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feat = QgsFeature()
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while provider.nextFeature(feat):
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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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@staticmethod
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def exportRasterLayer(layer):
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'''Takes a QgsRasterLayer and returns the filename to refer to it, which allows external
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apps which support only file-based layers to use it. It performs the necessary export
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in case the input layer 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 formats are exported.
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Only those formats not supported by GDAL are exported, so it is assumed that the external
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app uses GDAL to read the layer'''
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exts = GdalUtils.getSupportedRasterExtensions()
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for ext in exts:
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if (unicode(layer.source()).endswith(ext)):
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return unicode(layer.source())
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#TODO:Do the conversion here
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return unicode(layer.source())
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