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.utils.GMLTags;

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:PolygonMemberTypeBinding.java 195 2007-11-26 09:02:22Z jpiera $

 * $Log$

 * Revision 1.2  2007/05/14 09:31:05  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:polygonMemberType object. Example:

 * <p>

 * <pre>

 * <code>

 * <polygonMember>

 * <Polygon gid="_877789">

 * <outerBoundaryIs>

 * <LinearRing>

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

 * </LinearRing>

 * </outerBoundaryIs>

 * </Polygon>

 * </polygonMember>

 * </code>

 * </pre>

 * </p> 

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

 */

public class PolygonMemberTypeBinding {

        /**

         * It parses the gml:PolygonMember tag

         * @param parser

         * The XML parser

         * @param handler

         * The GPE parser that contains the content handler and

         * the error handler

         * @return

         * A polygon

         * @throws XmlStreamException

         * @throws IOException

         */

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

            parser.require(EventType.START_ELEMENT, GMLTags.GML_NAMESPACE_URI, null);

            QName tag = parser.getElementName();

            if (!(GMLTags.GML_POLYGONMEMBER.getLocalPart().equals(tag.getLocalPart()) || GMLTags.GML_SURFACEMEMBER

                .getLocalPart().equals(tag.getLocalPart()))) {

            throw new IllegalStateException(

                    "Expected gml:PolygonMember or gml:SurfaceMember, but got " + tag);

        }

            boolean endFeature = false;

                EventType currentTag;

                Object polygon = null;                

                currentTag = parser.getEventType();

                while (!endFeature){

                        switch(currentTag.getCode()){

                        case EventType.START_ELEMENT_CODE:

                                        polygon = parseTag(parser, handler, tag);

                                        break;

                                case EventType.END_ELEMENT_CODE:

                                        endFeature = parseLastTag(parser, handler, tag);                                

                                        break;

                                }

                                if (!endFeature){                                        

                                        currentTag = parser.nextTag();

                                        tag = parser.getElementName();

                                }

                        }                        

                return polygon;        

        }

        /**

         * It parses the XML tag

         * @param parser

         * @param handler

         * @param tag

         * @param id

         * @param srsName

         * @return

         * @throws XmlStreamException

         * @throws IOException

         */

        protected Object parseTag(IXmlStreamReader parser,GPEDefaultGmlParser handler, QName tag) throws XmlStreamException, IOException{

                Object polygon = null;

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

                        polygon = handler.getProfile().getPolygonTypeBinding().parse(parser, handler);

                }

                return polygon;

        }

        /**

         * Parses the last tag

         * @param parser

         * @param handler

         * @param tag

         * @return

         */

        protected boolean parseLastTag(IXmlStreamReader parser,GPEDefaultGmlParser handler, QName tag){

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

                        return true;

                }

                return false;

        }

}