Application: gvSIG desktop

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

 *

 * Copyright (C) 2006 Prodevelop 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

 *

 *   Prodevelop Integraci?n de Tecnolog?as SL

 *   Conde Salvatierra de ?lava , 34-10

 *   46004 Valencia

 *   Spain

 *

 *   +34 963 510 612

 *   +34 963 510 968

 *   gis@prodevelop.es

 *   http://www.prodevelop.es

 */

package es.prodevelop.cit.gvsig.fmap.drivers.jdbc.oracle;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

import oracle.sql.ROWID;

import oracle.sql.STRUCT;

import com.hardcode.gdbms.driver.exceptions.ReadDriverException;

import com.hardcode.gdbms.engine.values.Value;

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

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

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

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

/**

 * Oracle feature iterator. An instance of this class is returned whaen gvSIG

 * asks for a feature iterator for a new viewport.

 *

 * @author jldominguez

 *

 */

public class OracleSpatialFeatureIterator implements IFeatureIterator {

    private OracleSpatialDriver driver;

    private ResultSet rs = null;

    private int oneBasedGeoColInd = 0;

    private boolean useGeotools = false;

    private Statement st;

    /**

     * Constructor.

     *

     * @param parent the driver that creates it

     * @param _rs the result set to be iterated (already computed by the driver)

     * @param _st the statement that generated the result set. The iterator will close it.

     * @param geoColIndex index of the geometry field

     * @param _useGeotools a switch to decide if the geotools classes

     * must be used to deal with geometris

     */

    public OracleSpatialFeatureIterator(OracleSpatialDriver parent,

        ResultSet _rs, Statement _st, int geoColIndex, boolean _useGeotools) {

        driver = parent;

        rs = _rs;

        st = _st;

        useGeotools = _useGeotools;

        oneBasedGeoColInd = geoColIndex;

    }

    public boolean hasNext() throws ReadDriverException {

        if (rs == null) {

            return false;

        }

        try {

            boolean _resp = rs.next();

            if (!_resp) {

                rs.close();

                st.close();

            }

            return _resp;

        } catch (SQLException se) {

                throw new ReadDriverException(driver.getName(), se);

        }

    }

    public IFeature next() throws ReadDriverException {

        if (rs == null) {

            return null;

        }

        IFeature ife = null;

        try {

            ROWID ri = (ROWID) rs.getObject(1);

            Value[] atts = driver.getAttributes(rs);

            String gid = ri.stringValue();

            STRUCT _st = (oracle.sql.STRUCT) rs.getObject(oneBasedGeoColInd);

            IGeometry theGeom = driver.getGeometryUsing(_st, useGeotools);

            ife = new DefaultFeature(theGeom, atts, gid);

        }

        catch (SQLException se) {

                throw new ReadDriverException(driver.getName(), se);

        }

        return ife;

    }

    public void closeIterator() throws ReadDriverException {

        try {

            rs.close();

            st.close();

        }

        catch (SQLException se) {

            throw new ReadDriverException(driver.getName(), se);

        }

    }

    /**

     * Utility method to get the oracle geometry type as a human-readable String.

     *

     * @param type the oracle geometry type

     * @return a human-readable String describing it.

     */

    public static String getJGeometryTypeName(int type) {

        String resp = "Unknown JGeometry type (" + type + ")";

        switch (type) {

        case OracleSpatialDriver.JGeometry_GTYPE_COLLECTION:

            resp = "Collection";

            break;

        case OracleSpatialDriver.JGeometry_GTYPE_CURVE:

            resp = "Curve";

            break;

        case OracleSpatialDriver.JGeometry_GTYPE_MULTICURVE:

            resp = "Multi-curve";

            break;

        case OracleSpatialDriver.JGeometry_GTYPE_MULTIPOINT:

            resp = "Multi-point";

            break;

        case OracleSpatialDriver.JGeometry_GTYPE_MULTIPOLYGON:

            resp = "Multi-polygon";

            break;

        case OracleSpatialDriver.JGeometry_GTYPE_POINT:

            resp = "Point";

            break;

        case OracleSpatialDriver.JGeometry_GTYPE_POLYGON:

            resp = "Polygon";

            break;

        }

        return resp;

    }

}