Application: gvSIG desktop

/*

 * Created on 04-mar-2005

 *

 * gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana

 * 

 * Copyright (C) 2004 IVER T.I. and Generalitat Valenciana.

 * 

 * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

 *  

 * For more information, contact:

 *

 *  Generalitat Valenciana

 *   Conselleria d'Infraestructures i Transport

 *   Av. Blasco Ib??ez, 50

 *   46010 VALENCIA

 *   SPAIN

 *

 *      +34 963862235

 *   gvsig@gva.es

 *      www.gvsig.gva.es

 * 

 *    or

 * 

 *   IVER T.I. S.A

 *   Salamanca 50

 *   46005 Valencia

 *   Spain

 * 

 *   +34 963163400

 *   dac@iver.es

 */

package com.iver.cit.gvsig.fmap.drivers.jdbc.postgis;

import java.awt.geom.Rectangle2D;

import java.sql.Connection;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

import org.postgis.PGbox3d;

import com.iver.cit.gvsig.fmap.core.IGeometry;

import com.iver.cit.gvsig.fmap.drivers.DefaultDBDriver;

import com.iver.cit.gvsig.fmap.drivers.DriverAttributes;

import com.iver.cit.gvsig.fmap.drivers.jdbc.GeometryIterator;

import com.vividsolutions.jts.io.ParseException;

/**

 * @author FJP

 *

 * TODO To change the template for this generated type comment go to

 * Window - Preferences - Java - Code Generation - Code and Comments

 */

public class PostGisDriver extends DefaultDBDriver {

    private WKTParser parser = new WKTParser();

    private int fetch_min=-1;

    private int fetch_max=-1;

    private Statement st;

    private Rectangle2D fullExtent = null;

    private String strAux;

    /**

     * 

     */

    public PostGisDriver() {

    }

    /* (non-Javadoc)

     * @see com.iver.cit.gvsig.fmap.drivers.VectorialDriver#getDriverAttributes()

     */

    public DriverAttributes getDriverAttributes() {

        return null;

    }

    /* (non-Javadoc)

     * @see com.hardcode.driverManager.Driver#getName()

     */

    public String getName() {

        return "PostGIS JDBC Driver";

    }

        /**

         * @see com.iver.cit.gvsig.fmap.layers.ReadableVectorial#getShape(int)

         */

        public IGeometry getShape(int index) {

            IGeometry geom = null;

            boolean resul;

                try {

                    // EL ABSOLUTE NO HACE QUE SE VUELVAN A LEER LAS

                    // FILAS, ASI QUE MONTAMOS ESTA HISTORIA PARA QUE

                    // LO HAGA

                    // System.out.println("getShape " + index);

                    if (index < fetch_min)

                    {

                        rs.close();

                            rs = st.executeQuery(sqlOrig);

                        fetch_min = 0;

                        fetch_max = rs.getFetchSize();

                    }

                    while (index >= fetch_max)

                    {

                        rs.last();

                        // forzamos una carga

                        rs.next();

                        fetch_min = fetch_max;

                        fetch_max = fetch_max + rs.getFetchSize();

                        // System.out.println("fetchSize = " + rs.getFetchSize() + " " + fetch_min + "-" + fetch_max);

                    }

                    rs.absolute(index+1 - fetch_min);

                    strAux = rs.getString(1);                

                    geom = parser.read(strAux);                

            } catch (SQLException e) {

                e.printStackTrace();

            } catch (ParseException e) {

                e.printStackTrace();

            }

            return geom;

        }

        /**

         * @param conn

         * @param tableName

         * @param fields OJO: EL PRIMER CAMPO HA DE SER EL DE GEOMETRIA

         * @param whereClause

         */

        public void setData(Connection conn, String tableName, String fields, String whereClause)

        {

            this.conn = conn;            

            this.tableName = tableName;

            this.fields = fields;

            this.whereClause = whereClause;

            this.sqlOrig = "SELECT " + fields + " FROM " + tableName + " " + whereClause;

            try {

                st = conn.createStatement(ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY);

                st.setFetchSize(5000);

                rs = st.executeQuery(sqlOrig);

            fetch_min = 0;

            fetch_max = rs.getFetchSize();

            metaData = rs.getMetaData();

        } catch (SQLException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        }

        /**

         * @see com.iver.cit.gvsig.fmap.layers.ReadableVectorial#getFullExtent()

         */

        public Rectangle2D getFullExtent(){

            if (fullExtent == null)

            {

                try

            {

                    Statement s = conn.createStatement();                    

                    ResultSet r = s.executeQuery("SELECT extent(the_geom) AS FullExtent FROM " + tableName);

                    r.next();

                    String strAux = r.getString(1);

                    System.out.println("fullExtent = " + strAux);

                    PGbox3d regeom = new PGbox3d(strAux.toString());

                    double x = regeom.getLLB().x;

                    double y = regeom.getLLB().y;

                    double w = regeom.getURT().x -x;

                    double h = regeom.getURT().y - y;

                fullExtent = new Rectangle2D.Double(x, y, w, h);

            }

                catch (SQLException e)

                {

                    System.err.println(e.getMessage());

                }

            }

            return fullExtent;

        }

    /* (non-Javadoc)

     * @see com.iver.cit.gvsig.fmap.drivers.VectorialDatabaseDriver#getGeometryIterator(java.lang.String)

     */

    public GeometryIterator getGeometryIterator(String sql) throws com.iver.cit.gvsig.fmap.DriverException {

        Statement st;

        PostGisGeometryIterator geomIterator = null;

        try {

            st = conn.createStatement();

            st.setFetchSize(2000);

            ResultSet rs = st.executeQuery(sql);

            geomIterator = new PostGisGeometryIterator(rs);

        } catch (SQLException e) {

            e.printStackTrace();

            throw new com.iver.cit.gvsig.fmap.DriverException(e);

        }

        return geomIterator;

    }

}