Application: gvSIG desktop » gvSIG geoprocess

/**

 * gvSIG. Desktop Geographic Information System.

 *

 * Copyright (C) 2007-2012 gvSIG Association.

 *

 * 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.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,

 * MA  02110-1301, USA.

 *

 * For any additional information, do not hesitate to contact us

 * at info AT gvsig.com, or visit our website www.gvsig.com.

 */

package org.gvsig.geoprocess.algorithm.difference;

import org.gvsig.fmap.dal.exception.DataException;

import org.gvsig.fmap.dal.feature.FeatureSet;

import org.gvsig.fmap.dal.feature.FeatureStore;

import org.gvsig.fmap.dal.feature.FeatureType;

import org.gvsig.geoprocess.algorithm.base.core.GeometryOperation;

import org.gvsig.geoprocess.algorithm.base.core.ScalableUnionOperation;

import org.gvsig.geoprocess.lib.sextante.AbstractSextanteGeoProcess;

import org.gvsig.geoprocess.lib.sextante.dataObjects.FlyrVectIVectorLayer;

import es.unex.sextante.core.Sextante;

import es.unex.sextante.dataObjects.IVectorLayer;

import es.unex.sextante.exceptions.GeoAlgorithmExecutionException;

import es.unex.sextante.exceptions.RepeatedParameterNameException;

import es.unex.sextante.outputs.OutputVectorLayer;

/**

 * Difference algorithm

 * @author <a href="mailto:nachobrodin@gmail.com">Nacho Brodin</a>

 */

public class DifferenceAlgorithm extends AbstractSextanteGeoProcess {

        public static final String  RESULT    = "RESULT";

        public static final String  LAYER     = "LAYER";

        public static final String  DIF       = "DIF";

        public static final String  CHECK     = "CHECK";

        public void defineCharacteristics(){

        setName(getTranslation("Difference"));

        setGroup(getTranslation("basic_vect_algorithms"));

        // setGeneratesUserDefinedRasterOutput(false);

                try {

                        m_Parameters.addInputVectorLayer(LAYER, getTranslation("Input_layer"),

                                                                                                IVectorLayer.SHAPE_TYPE_WRONG, 

                                                                                                true);

                        m_Parameters.addInputVectorLayer(DIF, getTranslation("Overlays_layer"),

                                                                                                IVectorLayer.SHAPE_TYPE_WRONG, 

                                                                                                true);

            m_Parameters.addBoolean(CHECK, 

                            getTranslation("Selected_geometries_input_layer"), false);

                } catch (RepeatedParameterNameException e) {

                        Sextante.addErrorToLog(e);

                }

                addOutputVectorLayer(RESULT, getTranslation("Difference"),

                                                                OutputVectorLayer.SHAPE_TYPE_UNDEFINED);

        }

        /*

         * (non-Javadoc)

         * @see es.unex.sextante.core.GeoAlgorithm#processAlgorithm()

         */

        public boolean processAlgorithm() throws GeoAlgorithmExecutionException {

                if(existsOutPutFile(DifferenceAlgorithm.RESULT, 0)) {

                    throw new GeoAlgorithmExecutionException(getTranslation("file_exists"));

            }

                org.gvsig.fmap.geom.Geometry overlayGeometry = null;

                IVectorLayer dif = m_Parameters.getParameterValueAsVectorLayer(DIF);

                IVectorLayer layer = m_Parameters.getParameterValueAsVectorLayer(LAYER);

                boolean selectedGeom = m_Parameters.getParameter(CHECK).getParameterValueAsBoolean();

                try {

                        overlayGeometry = ScalableUnionOperation.joinLayerGeometries(dif);

                } catch (Exception e) {

                        Sextante.addErrorToLog(e);

                        return false;

                }

                FeatureStore storeLayer = null;

                if(layer instanceof FlyrVectIVectorLayer)

                        storeLayer = ((FlyrVectIVectorLayer)layer).getFeatureStore();

                else

                        return false;

                try {

                        FeatureSet features = null;

                        features = storeLayer.getFeatureSet();

                        FeatureType featureType = features.getDefaultFeatureType();

            FeatureStore outFeatStore =

                buildOutPutStore(featureType, layer.getShapeType(),

                    getTranslation("Difference"), RESULT);

                        GeometryOperation operation = new DifferenceOperation(overlayGeometry, this);

            operation.setTaskStatus(getStatus());

                        operation.computesGeometryOperation(storeLayer, outFeatStore, attrNames, selectedGeom, true);

                } catch (DataException e) {

                        Sextante.addErrorToLog(e);

                        return false;

                }

                if(getTaskMonitor().isCanceled())

                        return false;

                return true;

        }

}