Application: gvSIG desktop » gvSIG data provider for GPE

package org.gvsig.gpe.gml.parser.v2.geometries;

import java.io.IOException;

import javax.xml.namespace.QName;

import org.gvsig.gpe.gml.parser.GPEDefaultGmlParser;

import org.gvsig.gpe.gml.parser.v2.coordinates.CoordTypeIterator;

import org.gvsig.gpe.gml.parser.v2.coordinates.CoordinatesTypeIterator;

import org.gvsig.gpe.gml.utils.GMLTags;

import org.gvsig.gpe.parser.ICoordinateIterator;

import org.gvsig.gpe.warnings.PolygonNotClosedWarning;

import org.gvsig.gpe.xml.stream.EventType;

import org.gvsig.gpe.xml.stream.IXmlStreamReader;

import org.gvsig.gpe.xml.stream.XmlStreamException;

import org.gvsig.gpe.xml.utils.CompareUtils;

/* 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:LinearRingTypeBinding.java 195 2007-11-26 09:02:22Z jpiera $

 * $Log$

 * Revision 1.4  2007/05/16 09:29:12  jorpiell

 * The polygons has to be closed

 *

 * Revision 1.3  2007/05/15 11:55:11  jorpiell

 * MultiGeometry is now supported

 *

 * Revision 1.2  2007/05/14 09:31:06  jorpiell

 * Add the a new class to compare tags

 *

 * Revision 1.1  2007/05/07 12:58:42  jorpiell

 * Add some methods to manage the multigeometries

 *

 *

 */

/**

 * It parses a gml:linearRingType object. Example:

 * <p>

 * <pre>

 * <code>

 * <LinearRing>

 * <coordinates>0.0,0.0 100.0,0.0 50.0,100.0 0.0,0.0</coordinates>

 * </LinearRing>

 * </code>

 * </pre>

 * </p> 

 * @author Jorge Piera LLodr? (jorge.piera@iver.es)

 */

public class LinearRingTypeBinding extends GeometryBinding{

        /**

         * It parses the gml:LinearRing tag and return the 

         * Object

         * @param parser

         * The XML parser

         * @param handler

         * The GPE parser that contains the content handler and

         * the error handler

         * @return

         * A linear ring

         * @throws XmlStreamException

         * @throws IOException

         */

        public Object parse(IXmlStreamReader parser,GPEDefaultGmlParser handler) throws XmlStreamException, IOException{

        parser.require(EventType.START_ELEMENT, GMLTags.GML_LINEARRING);

                Object linearRing = null;

                super.setAtributtes(parser, handler.getErrorHandler());

                ICoordinateIterator coordinatesIteartor = parseCoordinates(parser, handler);        

                linearRing = handler.getContentHandler().startLinearRing(id, coordinatesIteartor, srsName);

                handler.getContentHandler().endLinearRing(linearRing);

                return linearRing;

        }

        /**

         * It parses the gml:LinearRing tag and return the 

         * coordinates

         * @param parser

         * The XML parser

         * @param handler

         * The GPE parser that contains the content handler and

         * the error handler

         * @return

         * An array of coordinates

         * @throws XmlStreamException

         * @throws IOException

         * @throws PolygonNotClosedWarning 

         */

        public ICoordinateIterator parseCoordinates(IXmlStreamReader parser,GPEDefaultGmlParser handler) throws XmlStreamException, IOException {

                boolean endFeature = false;

                EventType currentTag;

                QName tag = parser.getElementName();

                currentTag = parser.getEventType();

                while (!endFeature){

                        switch(currentTag.getCode()){

                        case EventType.START_ELEMENT_CODE:

                                ICoordinateIterator iterator = parseTag_(parser, handler, tag);

                                if (iterator != null){

                                        return iterator;

                                }

                        case EventType.END_ELEMENT_CODE:

                                if (CompareUtils.compareWithNamespace(tag,GMLTags.GML_LINEARRING)){                                                

                                }

                                break;

                        }

                        if (!endFeature){                                        

                                currentTag = parser.nextTag();

                                tag = parser.getElementName();

                        }

                }                        

                //The first and the last coordinates has to be the same

//                if ((coordinates[0][0] != coordinates[0][coordinates[0].length - 1]) ||

//                                (coordinates[1][0] != coordinates[1][coordinates[1].length - 1]) ||

//                                (coordinates[2][0] != coordinates[2][coordinates[2].length - 1])){

//                        handler.getErrorHandler().addWarning(new PolygonNotClosedWarning(coordinates));

//                }

                return null;

        }

        /**

         * 

         * @param parser

         * @param handler

         * @param tag

         * @param coordsContainer

         * @return

         * @throws XmlStreamException

         * @throws IOException

         */

        protected ICoordinateIterator parseTag_(IXmlStreamReader parser,GPEDefaultGmlParser handler, QName tag) throws XmlStreamException, IOException{

                if (CompareUtils.compareWithNamespace(tag,GMLTags.GML_COORDINATES)){

                        CoordinatesTypeIterator coordinatesIterator = handler.getProfile().getCoordinatesTypeBinding();

                        coordinatesIterator.initialize(parser, handler,GMLTags.GML_LINEARRING);

                        return coordinatesIterator;

                }else if (CompareUtils.compareWithNamespace(tag,GMLTags.GML_COORD)){

                        CoordTypeIterator coordinatesIterator = handler.getProfile().getCoordTypeBinding();

                        coordinatesIterator.initialize(parser, handler,GMLTags.GML_LINEARRING);

                        return coordinatesIterator;

                }

                return null;

        }

}