Application: gvSIG desktop

/**

 * gvSIG. Desktop Geographic Information System.

 *

 * Copyright (C) 2007-2013 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 3 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.fmap.geom.jts.spatialindex;

import com.vividsolutions.jts.index.quadtree.Quadtree;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.util.Iterator;

import java.util.List;

import org.apache.commons.lang3.SerializationUtils;

import org.gvsig.fmap.geom.GeometryManager;

import org.gvsig.fmap.geom.SpatialIndex;

import org.gvsig.fmap.geom.SpatialIndexFactory;

import org.gvsig.fmap.geom.jts.GeometryJTS;

import org.gvsig.tools.dynobject.DynObject;

import org.gvsig.tools.visitor.Visitor;

public class SpatialIndexJTSQuadtree extends AbstractSpatialIndex implements SpatialIndex {

    private com.vividsolutions.jts.index.quadtree.Quadtree index = null;

    private boolean modified;

    public SpatialIndexJTSQuadtree(GeometryManager geometryManager, SpatialIndexFactory factory, DynObject parameters) {

        super(geometryManager, factory, parameters);

        this.index = null;

        this.modified = false;

        open();

    }

    @Override

    public void open() {

        this.index = new com.vividsolutions.jts.index.quadtree.Quadtree();

        File f = (File) this.getParameter("file");

        if( f!=null && f.exists() ) {

            try {

                this.load(f);

            } catch (FileNotFoundException ex) {

                throw new RuntimeException("Can't load spatial index from '"+f.getAbsolutePath()+"'.");

            }

        }

    }

    @Override

    public void close() {

        File f = (File) this.getParameter("file");

        if( f!=null && modified ) {

            try {

                this.save(f);

            } catch (FileNotFoundException ex) {

                throw new RuntimeException("Can't save spatial index to '"+f.getAbsolutePath()+"'.");

            }

        }

        this.index = null;

    }

    private void load(File fname) throws FileNotFoundException {

        FileInputStream is = new FileInputStream(fname);

        Object x = SerializationUtils.deserialize(is);

        this.index = (Quadtree) x;

        this.modified = false;

    }

    private void save(File fname) throws FileNotFoundException {

        FileOutputStream os = new FileOutputStream(fname);

        SerializationUtils.serialize(this.index, os);

        this.modified = false;

    }

    private com.vividsolutions.jts.geom.Geometry asJTS(org.gvsig.fmap.geom.Geometry geom) {

        return ((GeometryJTS)geom).getJTS();

    }

    @Override

    public long size() {

        return this.index.size();

    }

    @Override

    public void query(org.gvsig.fmap.geom.primitive.Envelope envelope,

            Visitor visitor) {

        com.vividsolutions.jts.index.ItemVisitor visitor_jts = new JTSVisitorWrapper(visitor);

        com.vividsolutions.jts.geom.Envelope env_jts = asJTS(envelope.getGeometry()).getEnvelopeInternal();

        this.index.query(env_jts, visitor_jts);

    }

    @Override

    public Iterator query(org.gvsig.fmap.geom.primitive.Envelope envelope,long limit) {

        if( limit!=0 ) {

            throw new UnsupportedOperationException("Not supported yet.");

        }

        com.vividsolutions.jts.geom.Envelope env_jts = asJTS(envelope.getGeometry()).getEnvelopeInternal();

        List result = this.index.query(env_jts);

        return result.iterator();

    }

    @Override

    public Iterator queryNearest(org.gvsig.fmap.geom.primitive.Envelope envelope, long limit) {

        throw new UnsupportedOperationException("Not supported yet.");

    }

    @Override

    public Iterator queryAll() {

        List result = this.index.queryAll();

        return result.iterator();

    }

    @Override

    public void insert(org.gvsig.fmap.geom.primitive.Envelope envelope, Object data) {

        com.vividsolutions.jts.geom.Envelope env_jts = asJTS(envelope.getGeometry()).getEnvelopeInternal();

        index.insert(env_jts, data);

        this.modified = true;

    }

    @Override

    public boolean remove(org.gvsig.fmap.geom.primitive.Envelope envelope, Object data) {

        com.vividsolutions.jts.geom.Envelope env_jts = asJTS(envelope.getGeometry()).getEnvelopeInternal();

        this.modified = true;

        return index.remove(env_jts, data);

    }

    @Override

    public void removeAll() {

        index = new com.vividsolutions.jts.index.quadtree.Quadtree();

        this.modified = true;

    }

    private class JTSVisitorWrapper implements com.vividsolutions.jts.index.ItemVisitor {

        private Visitor visitor = null;

        public JTSVisitorWrapper(Visitor visitor) {

            this.visitor = visitor;

        }

        @Override

        public void visitItem(Object arg0) {

            try {

                this.visitor.visit(arg0);

            } catch (Exception e) {

                throw new RuntimeException();

            }

        }

    }

}