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.spatialjoin;

import java.util.Iterator;

import org.apache.commons.lang3.mutable.MutableDouble;

import org.apache.commons.lang3.mutable.MutableObject;

import es.unex.sextante.core.Sextante;

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

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

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

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

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

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

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

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

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

import org.gvsig.fmap.geom.Geometry;

import org.gvsig.fmap.geom.GeometryLocator;

import org.gvsig.fmap.geom.GeometryManager;

import org.gvsig.fmap.geom.SpatialIndex;

import org.gvsig.fmap.geom.exception.CreateGeometryException;

import org.gvsig.fmap.geom.primitive.Envelope;

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

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

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

import org.gvsig.tools.exception.BaseException;

import org.gvsig.tools.visitor.VisitCanceledException;

import org.gvsig.tools.visitor.Visitor;

/**

 *

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

 */

public class SpatiallyIndexedSpatialJoinOperation extends GeometryOperation {

        private FeatureStore               storeOverlay        = null;

        private FeatureSelection           featureSelection    = null;

        /**

         * Geometry.distance() is a costly operation. Thats the reason for we are

         * only using a nearest neighbor. TODO SpatialIndex works with Rectangle2D,

         * and this may be a simplification that drives to errors. Make additional

         * probes to use a number of default neighbors

         */

        static final int                  DEFAULT_NUM_NEIGBOURS = 1;

        /**

         * Number of neighbors that nearestFinder must found.

         */

        int                               numOfNeighbours       = DEFAULT_NUM_NEIGBOURS;

        /**

         * Specialized instance in nearest neighbor search.

         */

        private SpatialIndex              index                 = null;

        public SpatiallyIndexedSpatialJoinOperation(FlyrVectIVectorLayer targetLayer, SpatialIndex index, AbstractSextanteGeoProcess p) {

                super(p);

                this.index = index;

                storeOverlay = targetLayer.getFeatureStore();

        }

        /*

         * (non-Javadoc)

         * @see org.gvsig.geoprocess.algorithm.base.core.GeometryOperation#invoke(org.gvsig.fmap.geom.Geometry, org.gvsig.fmap.dal.feature.Feature)

         */

        @SuppressWarnings({ "unchecked", "deprecation" })

    public EditableFeature invoke(final org.gvsig.fmap.geom.Geometry g, Feature featureInput) {

            final MutableObject<Feature> foundFeature = new MutableObject<Feature>(null);

        boolean addedFeature = false;

        if (g == null)

            return lastEditFeature;

        try {

            final MutableDouble nearestDistance = new MutableDouble(Double.POSITIVE_INFINITY);

            index.query(g, new Visitor() {

                @Override

                public void visit(Object obj) throws VisitCanceledException, BaseException {

                    FeatureReference ref = (FeatureReference) obj;

                    Feature feat = ref.getFeature();

                    Geometry g2 = feat.getDefaultGeometry();

                    double dist = g.distance(g2);

                    if (dist <= nearestDistance.getValue()) {

                        nearestDistance.setValue(dist);

                        foundFeature.setValue(feat.getCopy());

                    }

                }

            });

            Iterator<?> iterator = index.queryNearest(g);

            while (iterator.hasNext()) {

                FeatureReference ref = (FeatureReference) iterator.next();

                Feature feat = ref.getFeature();

                Geometry g2 = feat.getDefaultGeometry();

                double dist = g.distance(g2);

                if (dist <= nearestDistance.getValue()) {

                    nearestDistance.setValue(dist);

                    foundFeature.setValue(feat.getCopy());

                }

            }

            if(foundFeature!=null){

                buildFeature(featureInput, foundFeature.getValue(), new Double(nearestDistance.getValue()), g);

                addedFeature = true;

            }

        } catch (Exception e) {

            Sextante.addErrorToLog(e);

        }

        return lastEditFeature;

    }

        /**

         * Builds a feature and adds it to the output file

         * @param feat1

         * @param feat2

         * @param value

         * @param g

         * @throws DataException

         */

        private void buildFeature(Feature feat1, Feature feat2, Object value, org.gvsig.fmap.geom.Geometry g) throws DataException {

                EditableFeature outFeat = persister.getOutputFeatureStore().createNewFeature();

                int sizeFeat1 = feat1.getType().size() - 1;

                for (int i = 0; i < sizeFeat1; i++)

                        outFeat.set(i, feat1.get(i));

                for (int i = sizeFeat1; i < sizeFeat1 + feat2.getType().size() - 1; i++)

                        outFeat.set(i, feat2.get(i - sizeFeat1));

                outFeat.set(outFeat.getType().size() - 2, value);

                try {

                        persister.addFeature(outFeat, g);

                } catch (CreateGeometryException e) {

                        Sextante.addErrorToLog(e);

                }

        }

        /*

         * (non-Javadoc)

         * @see org.gvsig.geoprocess.algorithm.base.core.GeometryOperation#invoke(org.gvsig.fmap.geom.Geometry, org.gvsig.fmap.dal.feature.EditableFeature)

         */

        public void invoke(org.gvsig.fmap.geom.Geometry g, EditableFeature featureInput) {

        }

}