Application: gvSIG desktop

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

import java.io.IOException;

import org.gvsig.gpe.gml.GMLTags;

import org.gvsig.gpe.gml.GPEDefaultGmlParser;

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

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

import org.gvsig.gpe.warnings.PolygonNotClosedWarning;

import org.xmlpull.v1.XmlPullParser;

import org.xmlpull.v1.XmlPullParserException;

/* 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{

        protected CoordsContainer coordsContainer = null;

        /**

         * 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 XmlPullParserException

         * @throws IOException

         */

        public Object parse(XmlPullParser parser,GPEDefaultGmlParser handler) throws XmlPullParserException, IOException{

                Object linearRing = null;

                coordsContainer = null;

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

                double[][] coordinates;

                coordinates = parseCoordinates(parser, handler);        

                linearRing = handler.getContentHandler().startLinearRing(id, coordinates[0], coordinates[1], coordinates[2], 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 XmlPullParserException

         * @throws IOException

         * @throws PolygonNotClosedWarning 

         */

        public double[][] parseCoordinates(XmlPullParser parser,GPEDefaultGmlParser handler) throws XmlPullParserException, IOException {

                boolean endFeature = false;

                int currentTag;

                coordsContainer = null;

                double[][] coordinates = null;

                String tag = parser.getName();

                currentTag = parser.getEventType();

                while (!endFeature){

                        switch(currentTag){

                        case XmlPullParser.START_TAG:

                                coordinates = parseTag_(parser, handler, tag);

                                break;

                        case XmlPullParser.END_TAG:

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

                                        endFeature = true;

                                        //If the file contains the COORD tag instead of the

                                        //coordinates

                                        if (coordsContainer != null){

                                                coordinates = coordsContainer.getCoordinates();                                                                        

                                        }                                        

                                }

                                break;

                        case XmlPullParser.TEXT:                                        

                                break;

                        }

                        if (!endFeature){                                        

                                currentTag = parser.next();

                                tag = parser.getName();

                        }

                }                        

                //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 coordinates;

        }

        /**

         * 

         * @param parser

         * @param handler

         * @param tag

         * @param coordsContainer

         * @return

         * @throws XmlPullParserException

         * @throws IOException

         */

        protected double[][] parseTag_(XmlPullParser parser,GPEDefaultGmlParser handler, String tag) throws XmlPullParserException, IOException{

                double[][] coordinates = null;

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

                        coordinates = handler.getProfile().getCoordinatesTypeBinding().

                        parse(parser, handler);

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

                        double[] coord = handler.getProfile().getCoordTypeBinding().

                        parse(parser, handler);

                        if (coordsContainer == null){

                                coordsContainer = new CoordsContainer();

                        }

                        coordsContainer.addCoordinates(coord);

                }

                return coordinates;

        }

}