/** * JWAP - A Java Implementation of the WAP Protocols * Copyright (C) 2001-2004 Niko Bender * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */package net.sourceforge.jwap.util.wbxml;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.net.URLEncoder;import java.util.Iterator;import org.w3c.dom.Document;import org.xml.sax.EntityResolver;import org.xml.sax.InputSource;import org.xml.sax.SAXException;import org.xml.sax.XMLReader;import org.xml.sax.helpers.XMLReaderFactory;/** * <p>This class is used to encode an XML file into WBXML. </p>  *  * @author <a href="mailto:suvarna@witscale.com">Suvarna Kadam</a> * @see net.sourceforge.jwap.util.wbxml.XMLContentHandler * @see net.sourceforge.jwap.util.wbxml.TokenRepository */public class WBXMLEncoder {	private static WBXMLEncoder anInstance;	private Document xmlDocument;	private XMLContentHandler handler ;	private ByteArrayOutputStream tokenStream;	private int wbxmlVersion = 3; // WBXML version 1.3	private WBXMLEncoder() {		initialize();	}	private void initialize() {		tokenStream = new ByteArrayOutputStream();	}	public static WBXMLEncoder getInstance() {		if (anInstance == null)			anInstance = new WBXMLEncoder();		return anInstance;	}	public OutputStream encode(InputStream xmlStream) {//		extractCharEncoding(xmlStream);		try {			handler = new XMLContentHandler(getEncodingFrom(xmlStream));			XMLReader reader = XMLReaderFactory.createXMLReader();			reader.setFeature("http://xml.org/sax/features/validation", false);		//	reader.setFeature("http://xml.org/sax/features/external-general-entities", false);			reader.setContentHandler(handler);		//	reader.setErrorHandler(handler);		//	reader.setDTDHandler(handler);		//	reader.setEntityResolver(EntityResolver);            reader.setProperty("http://xml.org/sax/properties/lexical-handler", handler);						InputSource xmlSource = new InputSource(xmlStream);	//		reader.setFeature("http://xml.org/sax/features/validation",true);	      	reader.parse(xmlSource);//			javax.xml.parsers.SAXParser parser = javax.xml.parsers.SAXParserFactory.newInstance().newSAXParser(); //			parser.getXMLReader().setFeature("http://xml.org/sax/features/validation", false);//			InputSource xmlSource = new InputSource(xmlStream);//			parser.getXMLReader().setFeature("http://xml.org/sax/features/validation", false);//			parser.parse(xmlSource,handler);		} catch (SAXException saxExp) {			saxExp.printStackTrace();		} catch (IOException ioExp) {			ioExp.printStackTrace();		} 		encodeProlog();		encodeStringTable();		encodeBody();		return tokenStream;	}		private String getEncodingFrom(InputStream xmlStream) {	/*	BufferedReader reader = new BufferedReader(new InputStreamReader(xmlStream));		try {			String line = reader.readLine().trim();			while (line.length() == 0 || !line.startsWith("<?xml"))				line = reader.readLine();			if (line.startsWith("<?xml")) {				String remaining = line.split("encoding=\"")[1];				String encoding = remaining.substring(0, remaining.indexOf('"'));				reader.close();				return encoding;			}		} catch (IOException ioExp) {			ioExp.printStackTrace();		}		*/		return "utf-8";	}	/**	 * Please refer BNF of document structure.	 * start = version publicid charset strtbl body	 * 	 **/	public void encodeProlog() {//		tokenStream.write(wbxmlVersion);//		tokenStream.write(PublicIdentifiers.getInstance().getPublicIdentifierValue("UNKNOWN"));//	//	tokenStream.write(TokenRepository.getInstance().getCharEncoding());//		tokenStream.write(0); // string table length to do...	}	public void encodeBody() {		Iterator tokens = handler.getTokens();		while (tokens.hasNext()) {			Token aToken= (Token) tokens.next();			tokenStream.write(aToken.getValue());					}	}	public void encodeStringTable() {	}}