| gvSIG desktop 1

/* 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.dataset.io.rmf.ClassSerializer;

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

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 Double noData = null;

	/**

	 * Constructor. Asigna el valor NoData a serializar

	 * @param Double valor NoData

	 */

	public NoDataRmfSerializer(Double noData) {

		this.noData = noData;

	}

	/**

	 * Constructor.

	 */

	public NoDataRmfSerializer() {

	}

	/*

	 * (non-Javadoc)

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

	 */

	public String getMainTag() {

		return MAIN_TAG;

	}

	/*

	 * (non-Javadoc)

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

	 */

	public Object getResult() {

		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 {

			parser.nextTag();

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

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

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

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

						noData = Double.valueOf(parser.getAttributeValue(i));

				}

			}

			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 {

		StringBuffer b = new StringBuffer();

		if (noData == null)

			return "";

		b.append("<" + MAIN_TAG + " value=\"" + noData.toString() + "\">\n");

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

		return b.toString();

	}

}