Python LayerExporter.LayerExporter类代码示例

 def getSafeExportedLayers(self):
     '''Returns not the value entered by the user, but a string with semicolon-separated filenames
     which contains the data of the selected layers, but saved in a standard format (currently
     shapefiles for vector layers and GeoTiff for raster) so that they can be opened by most
     external applications.
     If there is a selection and SEXTANTE 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 no export at all
     and returns that value.
     Currently, it works just for vector layer. In the case of raster layers, it returns the
     parameter value.
     The layers are exported just the first time the method is called. The method can be called
     several times and it will always return the same string, performing the export only the first time.'''
     if self.exported:
         return self.exported
     self.exported = self.value
     layers = self.value.split(";")
     if layers == None or len(layers) == 0:
         return self.value
     if self.datatype == ParameterMultipleInput.TYPE_RASTER:
         for layerfile in layers:
             layer = QGisLayers.getObjectFromUri(layerfile, False)
             if layer:
                 filename = LayerExporter.exportRasterLayer(layer)
                 self.exported = self.exported.replace(layerfile, filename)
         return self.exported
     else:
         for layerfile in layers:
             layer = QGisLayers.getObjectFromUri(layerfile, False)
             if layer:
                 filename = LayerExporter.exportVectorLayer(layer)
                 self.exported = self.exported.replace(layerfile, filename)
         return self.exported

 def exportVectorLayer(self, orgFilename):
     #only export to an intermediate shp if the layer is not file-based.
     #We assume that almost all file formats will be supported by ogr
     #We also export if there is a selection
     if not os.path.exists(orgFilename):
         layer = QGisLayers.getObjectFromUri(orgFilename, False)
         if layer:
             filename = LayerExporter.exportVectorLayer(layer)
     else:
         layer = QGisLayers.getObjectFromUri(orgFilename, False)
         if layer:
             useSelection = SextanteConfig.getSetting(SextanteConfig.USE_SELECTED)
             if useSelection and layer.selectedFeatureCount() != 0:
                 filename = LayerExporter.exportVectorLayer(layer)
             else:
                 filename = orgFilename
         else:
             filename = orgFilename
     destFilename = self.getTempFilename()
     self.exportedLayers[orgFilename]= destFilename
     command = "v.in.ogr"
     command += " min_area=-1"
     command +=" dsn=\"" + os.path.dirname(filename) + "\""
     command +=" layer=" + os.path.basename(filename)[:-4]
     command +=" output=" + destFilename;
     command +=" --overwrite -o"
     return command

 def exportVectorLayer(self, orgFilename):
     #TODO: improve this. We are now exporting if it is not a shapefile,
     #but the functionality of v.in.ogr could be used for this.
     #We also export if there is a selection
     if not os.path.exists(orgFilename) or not orgFilename.endswith("shp"):
         layer = QGisLayers.getObjectFromUri(orgFilename, False)
         if layer:
             filename = LayerExporter.exportVectorLayer(layer)
     else:
         layer = QGisLayers.getObjectFromUri(orgFilename, False)
         if layer:
             useSelection = SextanteConfig.getSetting(SextanteConfig.USE_SELECTED)
             if useSelection and layer.selectedFeatureCount() != 0:
                 filename = LayerExporter.exportVectorLayer(layer)
             else:
                 filename = orgFilename
         else:
             filename = orgFilename
     destFilename = self.getTempFilename()
     self.exportedLayers[orgFilename]= destFilename
     command = "v.in.ogr"
     min_area = self.getParameterValue(self.GRASS_MIN_AREA_PARAMETER);
     command += " min_area=" + str(min_area)
     snap = self.getParameterValue(self.GRASS_SNAP_TOLERANCE_PARAMETER);
     command += " snap=" + str(snap)
     command += " dsn=\"" + os.path.dirname(filename) + "\""
     command += " layer=" + os.path.basename(filename)[:-4]
     command += " output=" + destFilename;
     command += " --overwrite -o"
     return command

    def processAlgorithm(self, progress):  
        self.createCatalog()   
        inputFilename = self.getParameterValue(self.INPUT)
        layer = QGisLayers.getObjectFromUri(inputFilename)
        workspaceName = self.getParameterValue(self.WORKSPACE)                            
        filename = LayerExporter.exportVectorLayer(layer)            
        basefilename = os.path.basename(filename)
        basepathname = os.path.dirname(filename) + os.sep + basefilename[:basefilename.find('.')]
        connection = {
            'shp': basepathname + '.shp',
            'shx': basepathname + '.shx',
            'dbf': basepathname + '.dbf',
            'prj': basepathname + '.prj'
        }
 
        workspace = self.catalog.get_workspace(workspaceName)
        self.catalog.create_featurestore(basefilename, connection, workspace)

 def getSafeExportedTable(self):
     '''Returns not the value entered by the user, but a string with a filename which
     contains the data of this table, but saved in a standard format (currently always
     a dbf file) so that it can be opened by most external applications.
     Works only if the table 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 table in a suitable format, it does not export at all
     and returns that value.
     The table 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
     table = QGisLayers.getObjectFromUri(self.value, False)
     if table:
         self.exported = LayerExporter.exportTable(table)
     else:
         self.exported = self.value
     return self.exported

 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 SEXTANTE 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 = QGisLayers.getObjectFromUri(self.value, False)
     if layer:
         self.exported = LayerExporter.exportVectorLayer(layer)
     else:
         self.exported = self.value
     return self.exported

    def processAlgorithm(self, progress):
        if SextanteUtils.isWindows():
            path = SagaUtils.sagaPath()
            if path == "":
                raise GeoAlgorithmExecutionException("SAGA folder is not configured.\nPlease configure it before running SAGA algorithms.")
        commands = list()
        self.exportedLayers = {}

        #1: Export rasters to sgrd and vectors to shp
        #   Tables must be in dbf format. We check that.
        if self.resample:
            self.calculateResamplingExtent()
        for param in self.parameters:
            if isinstance(param, ParameterRaster):
                if param.value == None:
                    continue
                value = param.value
                if not value.endswith("sgrd"):
                    commands.append(self.exportRasterLayer(value))
                if self.resample:
                    commands.append(self.resampleRasterLayer(value));
            if isinstance(param, ParameterVector):
                if param.value == None:
                    continue
                layer = QGisLayers.getObjectFromUri(param.value, False)
                if layer:
                    filename = LayerExporter.exportVectorLayer(layer)
                    self.exportedLayers[param.value]=filename
                elif not param.value.endswith("shp"):
                        raise GeoAlgorithmExecutionException("Unsupported file format")
            if isinstance(param, ParameterTable):
                if param.value == None:
                    continue
                table = QGisLayers.getObjectFromUri(param.value, False)
                if table:
                    filename = LayerExporter.exportTable(table)
                    self.exportedLayers[param.value]=filename
                elif not param.value.endswith("shp"):
                        raise GeoAlgorithmExecutionException("Unsupported file format")
            if isinstance(param, ParameterMultipleInput):
                if param.value == None:
                    continue
                layers = param.value.split(";")
                if layers == None or len(layers) == 0:
                    continue
                if param.datatype == ParameterMultipleInput.TYPE_RASTER:
                    for layerfile in layers:
                        if not layerfile.endswith("sgrd"):
                            commands.append(self.exportRasterLayer(layerfile))
                        if self.resample:
                            commands.append(self.resampleRasterLayer(layerfile));
                elif param.datatype == ParameterMultipleInput.TYPE_VECTOR_ANY:
                    for layerfile in layers:
                        layer = QGisLayers.getObjectFromUri(layerfile, False)
                        if layer:
                            filename = LayerExporter.exportVectorLayer(layer)
                            self.exportedLayers[layerfile]=filename
                        elif (not layerfile.endswith("shp")):
                            raise GeoAlgorithmExecutionException("Unsupported file format")

        #2: set parameters and outputs
        if SextanteUtils.isWindows():
            command = self.undecoratedGroup  + " \"" + self.cmdname + "\""
        else:
            command = "lib" + self.undecoratedGroup  + " \"" + self.cmdname + "\""

        for param in self.parameters:
            if param.value is None:
                continue
            if isinstance(param, (ParameterRaster, ParameterVector, ParameterTable)):
                value = param.value
                if value in self.exportedLayers.keys():
                    command+=(" -" + param.name + " \"" + self.exportedLayers[value] + "\"")
                else:
                    command+=(" -" + param.name + " \"" + value + "\"")
            elif isinstance(param, ParameterMultipleInput):
                s = param.value
                for layer in self.exportedLayers.keys():
                    s = s.replace(layer, self.exportedLayers[layer])
                command+=(" -" + param.name + " \"" + s + "\"");
            elif isinstance(param, ParameterBoolean):
                if param.value:
                    command+=(" -" + param.name);
            elif isinstance(param, ParameterFixedTable):
                tempTableFile  = SextanteUtils.getTempFilename("txt")
                f = open(tempTableFile, "w")
                f.write('\t'.join([col for col in param.cols]) + "\n")
                values = param.value.split(",")
                for i in range(0, len(values), 3):
                    s = values[i] + "\t" + values[i+1] + "\t" + values[i+2] + "\n"
                    f.write(s)
                f.close()
                command+=( " -" + param.name + " \"" + tempTableFile + "\"")
            elif isinstance(param, ParameterExtent):
                #'we have to substract/add half cell size, since saga is center based, not corner based
                halfcell = self.getOutputCellsize() / 2
                offset = [halfcell, -halfcell, halfcell, -halfcell]
                values = param.value.split(",")
                for i in range(4):
                    command+=(" -" + self.extentParamNames[i] + " " + str(float(values[i]) + offset[i]));
#.........这里部分代码省略.........