Application: gvSIG desktop

/*

 * Created on 07-jun-2007

 *

 * 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

 */

/* CVS MESSAGES:

*

* $Id$

* $Log$

* Revision 1.1  2007-06-07 11:49:28  azabala

* first version in cvs

*

*

*/

package com.iver.cit.gvsig.fmap.drivers.featureiterators;

import org.cresques.cts.ICoordTrans;

import org.cresques.cts.IProjection;

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

import com.iver.cit.gvsig.exceptions.expansionfile.ExpansionFileReadException;

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

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

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

/**

 * FeatureIterator for drivers that can not reproject

 * features

 * @author azabala

 *

 */

public class ReprojectWrapperFeatureIterator implements IFeatureIterator{

	IFeatureIterator featureIterator;

	protected IProjection sourceProjection;

	protected IProjection targetProjection;

	public ReprojectWrapperFeatureIterator(IFeatureIterator featureIterator, 

											IProjection sourceProj, 

											IProjection targetProj){

		this.featureIterator = featureIterator;

		this.sourceProjection = sourceProj;

		this.targetProjection = targetProj;

	}

	public boolean hasNext() throws ReadDriverException, ExpansionFileReadException {

		return featureIterator.hasNext();

	}

	public IFeature next() throws ReadDriverException {

		IFeature solution = featureIterator.next();

		reprojectIfNecessary(solution.getGeometry());

		return solution;

	}

	public void closeIterator() throws ReadDriverException {

		featureIterator.closeIterator();

	}

	/**

	 * 

	 * Checks if must reproject the given geom

	 * and reprojects it if true

	 * @param geom

	 * 

	 * TODO Esto es igual que DefaultFeatureIterator. Esta clase

	 * no extiende de la anterior porque esta clase no quiere saber nada

	 * del origen de datos (ReadableVectorial). Refactorizar y crear una

	 * clase abstracta intermedia entre ambas

	 */

	protected void reprojectIfNecessary(IGeometry geom){

		if(this.targetProjection != null && 

		   this.sourceProjection != null &&

		   this.targetProjection.getAbrev() != this.sourceProjection.getAbrev()){

			ICoordTrans trans = sourceProjection.getCT(targetProjection);

			geom.reProject(trans);

		}

	}

}