Application: gvSIG desktop » gvSIG data provider for GPE

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

import java.io.IOException;

import java.util.StringTokenizer;

import javax.xml.namespace.QName;

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

import org.gvsig.gpe.gml.parser.v2.geometries.DoubleTypeBinding;

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

import org.gvsig.gpe.utils.StringUtils;

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:CoordinatesTypeBinding.java 371 2008-01-10 09:30:19Z jpiera $

* $Log$

* Revision 1.3  2007/05/14 09:52:53  jorpiell

* Nullpointer exception fixed

*

* 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

*

* Revision 1.1  2007/05/07 07:06:46  jorpiell

* Add a constructor with the name and the description fields

*

*

*/

/**

 * It parses a gml:CoordinatesType object. 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)

 */

public class CoordinatesTypeIterator extends GmlCoodinatesIterator{

        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, GPEDefaultGmlParser handler, QName lastTag)

            throws XmlStreamException, IOException {

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

        super.initialize(parser, handler, lastTag);

        final EventType valueEvent = parser.next();

        if(valueEvent.isValue()){

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

            if (dimension == -1) {

                dimension = caculateDimension(coordinatesTag);

            }

            coordinatesString = new StringTokenizer(coordinatesTag, TUPLES_SEPARATOR);

            parser.nextTag();

        }

        parser.require(EventType.END_ELEMENT, GMLTags.GML_COORDINATES);

    }

        /**

         * Calculates the dimension from a array of coordinates

         * @param coordinatesTag

         * @return

         */

        private int caculateDimension(String coordinatesTag) {

                String firstPair;

                StringTokenizer st = new StringTokenizer(coordinatesTag,TUPLES_SEPARATOR);

                if (st.hasMoreTokens()){

                        firstPair = st.nextToken();

                }else{                        

                        firstPair = coordinatesTag;

                }                

                return StringUtils.splitString(firstPair, 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(),COORDINATES_SEPARATOR);

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

                        buffer[i] = DoubleTypeBinding.parse(coordinates[i],COORDINATES_DECIMAL);

                }        

        }

}