Application: gvSIG desktop

package org.gvsig.gpe.kml.parser.v21.coordinates;

import java.io.IOException;

import java.util.StringTokenizer;

import javax.xml.namespace.QName;

import org.gvsig.gpe.kml.parser.GPEDefaultKmlParser;

import org.gvsig.gpe.kml.utils.Kml2_1_Tags;

import org.gvsig.gpe.utils.StringUtils;

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:CoordinatesTypeBinding.java 357 2008-01-09 17:50:08Z jpiera $

 * $Log$

 * Revision 1.2  2007/06/07 14:53:59  jorpiell

 * Add the schema support

 *

 * Revision 1.1  2007/05/11 07:06:29  jorpiell

 * Refactoring of some package names

 *

 * Revision 1.4  2007/05/09 08:36:24  jorpiell

 * Add the bbox to the layer

 *

 * Revision 1.3  2007/05/08 08:22:37  jorpiell

 * Add comments to create javadocs

 *

 * Revision 1.2  2007/04/14 16:08:07  jorpiell

 * Kml writing support added

 *

 * Revision 1.1  2007/04/13 13:16:21  jorpiell

 * Add KML reading support

 *

 * Revision 1.1  2007/03/07 08:19:10  jorpiell

 * Pasadas las clases de KML de libGPE-GML a libGPE-KML

 *

 * Revision 1.1  2007/02/28 11:48:31  csanchez

 * *** empty log message ***

 *

 * Revision 1.1  2007/02/20 10:53:20  jorpiell

 * A?adidos los proyectos de kml y gml antiguos

 *

 * Revision 1.1  2007/02/12 13:49:18  jorpiell

 * A?adido el driver de KML

 *

 *

 */

/**

 * This class parses a coordinates tag. Example:

 * <p>

 * <pre>

 * <code>

 * <coordinates>60.0,60.0 60.0,90.0 90.0,90.0</coordinates>

 * </code>

 * </pre>

 * </p> 

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

 * @see http://code.google.com/apis/kml/documentation/kml_tags_21.html#coordinates

 */

public class CoordinatesTypeIterator extends KmlCoordinatesIterator{

        private StringTokenizer coordinatesString = null;        

        /**

         * It parses the gml:coordinates tag

         * @param parser

         * The XML parser

         * @param handler

         * The GPE parser that contains the content handler and

         * the error handler

         * @return

         * It retuns a matrix of doubles with 3 columns (x,y,z) and

         * one row for each coordinate.

         * @throws XmlStreamException

         * @throws IOException

         */

        /* (non-Javadoc)

         * @see org.gvsig.gpe.gml.parser.v2.coordinates.GmlCoodinatesIterator#initialize(org.gvsig.gpe.xml.stream.IXmlStreamReader, org.gvsig.gpe.gml.parser.GPEDefaultGmlParser, java.lang.String)

         */

        public void initialize(IXmlStreamReader parser,

                        GPEDefaultKmlParser handler, QName lastTag)

                        throws XmlStreamException, IOException {

                super.initialize(parser, handler, lastTag);

                boolean endFeature = false;

                int currentTag;                                

                QName tag = parser.getName();

                currentTag = parser.getEventType();

                while (!endFeature){

                        switch(currentTag){

                        case IXmlStreamReader.START_ELEMENT:

                                if (CompareUtils.compareWithOutNamespace(tag,Kml2_1_Tags.COORDINATES)){

                                        parser.next();                                                

                                        String coordinatesTag = parser.getText().trim();

                                        if (dimension == -1){

                                                dimension = caculateDimension(coordinatesTag);

                                        }                                                

                                        coordinatesString = new StringTokenizer(coordinatesTag);

                                        //Parses until the last tag...

                                        parseAll();

                                        return;

                                }

                                break;

                        case IXmlStreamReader.END_ELEMENT:

                                if (CompareUtils.compareWithOutNamespace(tag,Kml2_1_Tags.COORDINATES)){                                                

                                        endFeature = true;

                                }

                                break;

                        case IXmlStreamReader.CHARACTERS:                                        

                                break;

                        }

                        if (!endFeature){                                        

                                currentTag = parser.next();

                                tag = parser.getName();

                        }

                }                        

        }

        /**

         * Calculates the dimension from a array of coordinates

         * @param coordinatesTag

         * @return

         */

        private int caculateDimension(String coordinatesTag) {

//                String firstPair;

//                StringTokenizer st = new StringTokenizer(coordinatesTag);

//                if (st.hasMoreTokens()){

//                        firstPair = st.nextToken();

//                }else{                        

//                        firstPair = coordinatesTag;

//                }                

                return StringUtils.splitString(coordinatesTag, Kml2_1_Tags.COORDINATES_SEPARATOR).length;                

        }

        /*

         * (non-Javadoc)

         * @see org.gvsig.gpe.parser.ICoordinateIterator#hasNext()

         */

        public boolean hasNext() throws IOException {

                return coordinatesString.hasMoreTokens();        

        }

        /*

         * (non-Javadoc)

         * @see org.gvsig.gpe.parser.ICoordinateIterator#next(double[])

         */

        public void next(double[] buffer) throws IOException {

                String next = coordinatesString.nextToken();

                String[] coordinates = org.gvsig.gpe.utils.StringUtils.splitString(next.trim(),Kml2_1_Tags.COORDINATES_SEPARATOR);

                for (int i=0 ; i<coordinates.length ; i++){

                        buffer[i] = handler.getProfile().getDoubleBinding().parse(coordinates[i]);

                }        

        }

}