Application: gvSIG desktop

/*

 * Created on 10-abr-2006

 *

 * 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: 

*/

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

import org.cresques.cts.IProjection;

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

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

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

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.featureiterators.DefaultFeatureIterator;

import com.iver.cit.gvsig.fmap.layers.FBitSet;

import com.iver.cit.gvsig.fmap.layers.ReadableVectorial;

/**

 * 

 * Iterates over the selected features of a layer.

 * 

 * @author Alvaro Zabala

 *

 */

public class FeatureBitsetIterator extends DefaultFeatureIterator {

        FBitSet selection;

        public FeatureBitsetIterator(ReadableVectorial source,

                                                                                IProjection sourceProj, 

                                                                                IProjection targetProj, 

                                                                                String[] fieldNames)

                        throws ReadDriverException {

                super(source, sourceProj, targetProj, fieldNames);

                selection = this.source.getRecordset().getSelection();

                this.currentFeature = selection.nextSetBit(0);

        }

        public void setSelection(FBitSet bitSet){

                this.selection = bitSet;

                this.currentFeature = selection.nextSetBit(0);

        }

        public FeatureBitsetIterator(ReadableVectorial source)

                        throws ReadDriverException {

                super(source);

        }

        public boolean hasNext() throws ReadDriverException {

                return currentFeature != -1;

        }

        public IFeature next() throws ReadDriverException {

                try {

                        IGeometry geom = source.getShape(currentFeature);

                        reprojectIfNecessary(geom);

                        Value[] regAtt = getValues(currentFeature);

                        IFeature feat  = new DefaultFeature(geom, regAtt, currentFeature + "");

                        currentFeature = selection.nextSetBit(currentFeature + 1);

                        return feat;

                } catch (ExpansionFileReadException e) {

                        throw new ReadDriverException("",e);

                } 

        }

}