Application: gvSIG desktop » gvSIG raster

/* gvSIG. Geographic Information System of the Valencian Government

 *

 * Copyright (C) 2007-2008 Infrastructures and Transports Department

 * of the Valencian Government (CIT)

 *

 * 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.

 *

 */

package org.gvsig.raster.gdal.util;

import org.cresques.cts.ICRSFactory;

import org.cresques.cts.IProjection;

import org.gdal.osr.SpatialReference;

import org.gvsig.fmap.crs.CRSFactory;

import org.gvsig.fmap.dal.coverage.util.CRSUtils;

/**

 * Esta clase se encarga de hacer la conversion entre Wkt e IProjection.

 *

 * El uso se hace mediante dos llamadas estaticas que son:

 * convertIProjectionToWkt y

 * convertWktToIProjection.

 *

 * Antes de usarlos, hay que saber si tenemos acceso a gvSIG e intentar coger el

 * factory desde all?.

 * Ya que su uso consume tiempo y espacio de memoria y es preferible

 * reaprovechar ese objeto ya

 * creado. Esto se hace con setCRSFactory.

 *

 * En caso de no asignarse el ya existente, el crear? uno interno y lo dejara en

 * una variable estatica.

 *

 * @version 11/07/2008

 * @author BorSanZa - Borja S?nchez Zamorano (borja.sanchez@iver.es)

 */

public class DefaultCRSUtils implements CRSUtils {

    private ICRSFactory factory = null;

    public void setCRSFactory(ICRSFactory factory) {

        this.factory = factory;

    }

    /**

     * Devuelve el CRSFactory asignado desde fuera o creado desde dentro, todo

     * depende de como se haya

     * usado.

     *

     * @param code

     * @return

     */

    private IProjection getCRS(String code) {

        if (factory == null)

            factory = CRSFactory.getCRSFactory(); // new ProjectionPool();

        return factory.get(code);

    }

    public IProjection convertWktToIProjection(String wkt) {

        if (wkt == null || wkt.equals(""))

            return null;

        String code = null;

        String name = null;

        SpatialReference oSRSSource = new SpatialReference();

        oSRSSource.ImportFromWkt(wkt);

        code = oSRSSource.GetAuthorityCode("PROJCS");

        if (code == null)

            code = oSRSSource.GetAuthorityCode("GEOGCS");

        name = oSRSSource.GetAuthorityName("PROJCS");

        if (name == null)

            name = oSRSSource.GetAuthorityName("GEOGCS");

        try {

            if (name != null && code != null)

                return getCRS(name + ":" + code);

        } catch (NumberFormatException ex) {

            return null;

        }

        return null;

    }

    public String convertIProjectionToWkt(IProjection projection) {

        if (projection == null)

            return null;

        SpatialReference oSRSSource = new SpatialReference();

        String code = projection.getAbrev();

        String name = code.substring(0, code.indexOf(":"));

        code = code.substring(code.indexOf(":") + 1);

        do

            if (name.equals("EPSG")) {

                oSRSSource.ImportFromEPSG(Integer.parseInt(code));

                break;

            }

        while (false);

        return oSRSSource.ExportToWkt();

    }

}