| gvSIG desktop 1

package org.gvsig.gpe.xml;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.io.InputStream;

import org.gvsig.gpe.GPEContentHandler;

import org.gvsig.gpe.GPEErrorHandler;

import org.gvsig.gpe.GPEParser;

import org.xmlpull.v1.XmlPullParser;

/* 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:

 *

 * $Id$

 * $Log$

 * 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 InputStream inputStream = null;

        private XmlPullParser parser = null;

        public GPEXmlParser(GPEContentHandler contents, GPEErrorHandler errors) {

                super(contents, errors);

        }

        /*

         * (non-Javadoc)

         * @see org.gvsig.gpe.GPEParser#parse(java.io.File)

         */

        public void parse(File file) throws Exception{

                inputStream = createInputStream(file);

                parser = GPEXmlParserFactory.getParser();

                parser.setInput(getInputStream(), getEncoding());

                initParse();

        }

        /**

         * Creates an input stream from a file.

         * @param file

         * @return

         * @throws FileNotFoundException

         */

        protected abstract InputStream createInputStream(File file) throws FileNotFoundException;

        /**

         * This method start the parse process. It is called

         * before the XML parser is initialized

         */

        protected abstract void initParse();

        /**

         * @return Returns the encoding.

         * @throws IOException

         * @throws KmlException

         */

        private String getEncoding() throws IOException {

                String encoding = "UTF-8";

                InputStream is = getInputStream();

                int index = -1;

                int endIndex = -1;

                String header = "";

                boolean endHeader = false;

                int i = 1;

                while((!endHeader) && (i < 100)){

                        byte[] buffer = new byte[1];

                        is.read(buffer);

                        header = header + new String(buffer);

                        //This if is to locate the encoding string

                        if (index == -1) {

                                String searchText = "encoding=\"";

                                index = header.indexOf(searchText);

                                if (index > -1){

                                        header = "";

                                }

                        }

                        //This if is to locate the encoding value

                        if (index > -1){

                                String searchText = "\"";

                                endIndex = header.indexOf(searchText);

                                if (endIndex > -1){

                                        encoding = header.substring(0, endIndex);

                                }

                        }

                        //To finish to parse the header

                        if (endIndex > -1){

                                String searchText = ">";

                                int headerEndIndex = header.indexOf(searchText);

                                if (headerEndIndex > -1){

                                        endHeader = true;

                                }

                        }

                        i++;

                }

                return encoding;

        }

        /**

         * @return the inputStream

         */

        private InputStream getInputStream() {

                return inputStream;

        }

        /**

         * @return the parser

         */

        protected XmlPullParser getParser() {

                return parser;

        }

}