Application: gvSIG desktop

package org.gvsig.gpe.xml.parser;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.io.InputStream;

import java.io.PushbackInputStream;

import org.gvsig.gpe.parser.GPEParser;

import org.gvsig.gpe.xml.exceptions.GPEXmlEmptyFileException;

import org.gvsig.gpe.xml.stream.IXmlStreamReader;

import org.gvsig.gpe.xml.stream.XmlStreamException;

/* 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: GPEXmlParser.java 193 2007-11-26 08:58:56Z jpiera $

 * $Log$

 * Revision 1.11  2007/06/22 12:22:40  jorpiell

 * The typeNotFoundException has been deleted. It never was thrown

 *

 * Revision 1.10  2007/06/14 13:50:05  jorpiell

 * The schema jar name has been changed

 *

 * Revision 1.9  2007/06/07 14:53:30  jorpiell

 * Add the schema support

 *

 * Revision 1.8  2007/05/09 06:54:25  jorpiell

 * Change the File by URI

 *

 * Revision 1.7  2007/05/07 07:07:04  jorpiell

 * Add a constructor with the name and the description fields

 *

 * Revision 1.6  2007/04/19 12:01:55  jorpiell

 * Updated the getEncoding method

 *

 * Revision 1.5  2007/04/19 11:56:03  csanchez

 * Actualizacion protoripo libGPE

 *

 * Revision 1.4  2007/04/19 07:30:40  jorpiell

 * Add the add methods to teh contenhandler and change the register mode

 *

 * Revision 1.3  2007/04/18 12:54:45  csanchez

 * Actualizacion protoripo libGPE

 *

 * Revision 1.2  2007/04/12 11:47:15  jorpiell

 * Add a getParser method

 *

 * Revision 1.1  2007/04/12 10:23:41  jorpiell

 * Add some writers and the GPEXml parser

 *

 *

 */

/**

 * This class can be implemented by all the classes that implements a GPE driver based on the XML

 * format.

 * 

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

 */

public abstract class GPEXmlParser extends GPEParser {

    private IXmlStreamReader parser = null;

    public GPEXmlParser() {

        super();

    }

    /*

     * (non-Javadoc)

     * 

     * @see org.gvsig.gpe.GPEParser#parseStream()

     */

    protected void parseStream() {

        try {

            parser = getXmlReader();            

            initParse();

        } // EL PARSER LANZAR? UN EVENTO AL ERRORHANDLER SEG?N EL ERROR RECOGIDO

        catch (IOException e) {

            getErrorHandler().addError(e);

        } catch (GPEXmlEmptyFileException e) {

            getErrorHandler().addError(e);

        }

    }

    private IXmlStreamReader getXmlReader() throws XmlStreamException {

        PushbackInputStream pushBackStream = new PushbackInputStream(getInputStream());

        IXmlStreamReader reader;

        try {

            int firstByte = pushBackStream.read();

            pushBackStream.unread(firstByte);

            if (0x01 == firstByte) {

                // binary

                reader = GPEXmlParserFactory.getParser("text/x-bxml", pushBackStream);

            } else {

                // text

                reader = GPEXmlParserFactory.getParser("text/xml", pushBackStream);

            }

        } catch (IOException e) {

            throw new XmlStreamException(e);

        }

        return reader;

    }

    /*

     * (non-Javadoc)

     * 

     * @see org.gvsig.gpe.GPEParser#parseURI()

     */

    protected void parseURI() {

        try {

            // Creates an input stream to read the file

            File file = new File(getMainFile());

            InputStream inputStream = createInputStream(file);

            setInputStream(inputStream);

            parseStream();

        } catch (FileNotFoundException e) {

            System.out.println("ERROR: Fichero " + getMainFile().getPath() + " no encontrado");

            getErrorHandler().addError(e);

        } catch (IOException e) {

            System.out.println("ERROR: No se puede leer/escribir la codificaci?n del fichero: "

                    + e.getMessage());

            getErrorHandler().addError(e);

        }

    }

    /**

     * Creates an input stream from a file.

     * 

     * @param file

     * @return InputStream

     * @throws FileNotFoundException

     */

    protected abstract InputStream createInputStream(File file) throws FileNotFoundException;

    /**

     * This method start the parse process. It is called after the XML parser is initialized

     */

    protected abstract void initParse() throws GPEXmlEmptyFileException, XmlStreamException;

    /**

     * @return the parser

     */

    protected IXmlStreamReader getParser() {

        return parser;

    }

}