Application: gvSIG desktop

/* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana

 *

 * Copyright (C) 2005 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.

 */

package org.gvsig.raster.datastruct.serializer;

import java.io.IOException;

import java.io.Reader;

import java.io.StringReader;

import org.gvsig.raster.RasterLibrary;

import org.gvsig.raster.dataset.io.rmf.ClassSerializer;

import org.gvsig.raster.dataset.io.rmf.ParsingException;

import org.gvsig.raster.datastruct.NoData;

import org.gvsig.tools.ToolsLocator;

import org.gvsig.tools.extensionpoint.ExtensionPoint;

import org.gvsig.tools.extensionpoint.ExtensionPointManager;

import org.kxml2.io.KXmlParser;

import org.xmlpull.v1.XmlPullParserException;

/**

 * <P>

 * Clase para convertir a XML un valor NoData y obtener el valor desde un XML.

 * Esta clase implementa el interfaz IRmfBlock con los m?todos de escritura y

 * lectura. Estos ser?n utilizados por el gestor de ficheros RMF para escribir y

 * leer datos.

 * </P>

 * <P>

 * La estructura XML de un valor NoData es la siguiente:

 * </P>

 * <P>

 * &lt;NoData value="-99.999"><BR>

 * &lt;/NoData><BR>

 *

 * @version 18/12/2007

 * @author BorSanZa - Borja S?nchez Zamorano (borja.sanchez@iver.es)

 */

public class NoDataRmfSerializer extends ClassSerializer {

        private final String MAIN_TAG = "NoData";

        private NoData noData = null;

        /**

         * Registra NoDataRmfSerializer en los puntos de extension de Serializer

         */

        public static void register() {

                ExtensionPointManager extensionPoints =ToolsLocator.getExtensionPointManager();

                ExtensionPoint point=extensionPoints.get("Serializer");

                point.append("NoData", "", NoDataRmfSerializer.class);

        }

        /**

         * Constructor. Asigna el valor NoData a serializar

         * @param noData   Valor NoData

         * @param type     Tipo de NoData

         * @param dataType Tipo de datos de la capa

         */

        public NoDataRmfSerializer(NoData noData) {

                this.noData = noData;

        }

        /**

         * Constructor.

         */

        public NoDataRmfSerializer() {}

        /*

         * (non-Javadoc)

         * @see org.gvsig.raster.dataset.io.rmf.IRmfBlock#getMainTag()

         */

        public String getMainTag() {

                return MAIN_TAG;

        }

        /**

         * Devuelve el valor noData, en caso de no existir lo crea.

         * @return

         */

        private NoData getNoData() {

                if (noData == null)

                        noData = new NoData();

                return noData;

        }

        /*

         * (non-Javadoc)

         * @see org.gvsig.raster.dataset.io.rmf.IRmfBlock#getResult()

         */

        public Object getResult() {

                if (noData == null)

                        return null;

                if (getNoData().getType() == -1)

                        return null;

                if (getNoData().getType() == RasterLibrary.NODATATYPE_LAYER)

                        return null;

                return noData;

        }

        /*

         * (non-Javadoc)

         * @see org.gvsig.raster.dataset.io.rmf.IRmfBlock#read(java.lang.String)

         */

        public void read(String xml) throws ParsingException {

                KXmlParser parser = new KXmlParser();

                Reader reader = new StringReader(xml);

                try {

                        parser.setInput(reader);

                } catch (XmlPullParserException e) {

                        throw new ParsingException(xml);

                }

                try {

                        int tag = parser.nextTag();

                        if (parser.getEventType() != KXmlParser.END_DOCUMENT) {

                                parser.require(KXmlParser.START_TAG, null, MAIN_TAG);

                                while (tag != KXmlParser.END_DOCUMENT) {

                                        switch (tag) {

                                                case KXmlParser.START_TAG:

                                                        if (parser.getName().equals("Data")) {

                                                                for (int i = 0; i < parser.getAttributeCount(); i++) {

                                                                        if (parser.getAttributeName(i).equals("value")) {

                                                                                getNoData().setValue(Double.parseDouble((String) parser.getAttributeValue(i)));

                                                                        }

                                                                        if (parser.getAttributeName(i).equals("type")) {

                                                                                getNoData().setType(Integer.parseInt((String) parser.getAttributeValue(i)));

                                                                        }

                                                                }

                                                        }

                                        }

                                        tag = parser.next();

                                }

                        }

                        reader.close();

                } catch (XmlPullParserException e) {

                        throw new ParsingException(xml);

                } catch (IOException e) {

                        throw new ParsingException(xml);

                }

        }

        /*

         * (non-Javadoc)

         * @see org.gvsig.raster.dataset.io.rmf.IRmfBlock#write()

         */

        public String write() throws IOException {

                if (noData == null)

                        return "";

                if (getNoData().getType() == RasterLibrary.NODATATYPE_LAYER)

                        return "";

                StringBuffer b = new StringBuffer();

                b.append("<" + MAIN_TAG + ">\n");

                b.append("\t<Data");

                if (getNoData().getType() == RasterLibrary.NODATATYPE_USER)

                        b.append(" value=\"" + getNoData().getValue() + "\"");

                b.append(" type=\"" + getNoData().getType() + "\"/>\n");

                b.append("</" + MAIN_TAG + ">\n");

                return b.toString();

        }

}