/** * 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.IOException;import java.util.Enumeration;import java.util.Iterator;import java.util.Stack;import java.util.Vector;import net.sourceforge.jwap.util.TransTable;import org.xml.sax.Attributes;import org.xml.sax.InputSource;import org.xml.sax.Locator;import org.xml.sax.SAXException;import org.xml.sax.SAXParseException;import org.xml.sax.ext.LexicalHandler;import org.xml.sax.helpers.DefaultHandler;/** * <p>This class is used by WBXMLEncoder to encode an XML file into WBXML. * It catches the SAX events as the XML document is parsed. Token stream * is generated by reading the mapped byte codes for the elements and attributes * These mappings are read from the token repository for the given XML vocabulary</p> * * @author <a href="mailto:suvarna@witscale.com">Suvarna Kadam</a> * @see net.sourceforge.jwap.util.wbxml.WBXMLEncoder * @see net.sourceforge.jwap.util.wbxml.TokenRepository */public class XMLContentHandler extends DefaultHandler implements LexicalHandler {	private Stack parentTrace;	private Vector tokens;	private String encoding;	private byte parentBitMask = (byte) 0x40;     // The bit representation 10000000	private byte attributeBitMask = (byte) 0x80;  // The bit representation 01000000	private byte[] stringTable;	private int stringTableOffset = 0;	private TokenRepository tokenRepository;	private boolean switchCodepage;	private boolean publicIdTokenAdded = false;	/**	 * Constructor for XMLContentHandler.	 */	public XMLContentHandler(String encoding) {		this.encoding = encoding.toUpperCase();		parentTrace = new Stack();		tokens = new Vector();	}	/**	 * @see org.xml.sax.ContentHandler#characters(char[], int, int)	 */	public void characters(char[] ch, int start, int length) throws SAXException {	//	System.out.println("characters");		String inlineString = String.valueOf(ch, start, length).trim();		if (inlineString.length() > 0) {			checkForParentTag();			writeInlineString(inlineString);		}	}	private int writeToStringBuf(String aString) {		/*		int index = 0;				for (int j = 0; j < aString.length(); j++)					stringTable[]= (byte) aString.charAt(j);				writeInlineStringToken((byte) 00);		*/		return 0;	}	/**	 * @see org.xml.sax.ContentHandler#endDocument()	 */	public void endDocument() throws SAXException {//		System.out.println("endDocument... tokens ----");//		for (int i = 0; i < tokens.size(); i++) {//			Token token = (Token) tokens.elementAt(i);//			if (token.getName().equals("STR_INLINE"))//				System.out.println((char) token.getValue() + "  "+token.getValue());//			else//				System.out.println(Integer.toHexString(token.getValue()) + " " + token.getName() + token.getValue());//		}		/*for (int i = 0; i < tokens.size(); i++) {			Token token = (Token) tokens.elementAt(i);			System.out.print(Integer.toHexString(token.getValue()) + " ");		}*/	}	/**	 * @see org.xml.sax.ContentHandler#endElement(String, String, String)	 */	public void endElement(String namespaceURI, String localName, String qName) throws SAXException {	//	System.out.println("endElement");		// pop the element from the stack if any		if (!parentTrace.isEmpty())			parentTrace.pop();		else			tokens.addElement(new TagToken("END element" + localName, GlobalTokens.END));	}	/**	 * @see org.xml.sax.ContentHandler#endPrefixMapping(String)	 */	public void endPrefixMapping(String prefix) throws SAXException {	//	System.out.println("endPrefixMapping");		if(switchCodepage) {					TokenRepository.switchCodepage(null);					switchCodepage = false;			}	}	/**	 * @see org.xml.sax.ErrorHandler#error(SAXParseException)	 */	public void error(SAXParseException exception) throws SAXException {		//System.out.println("error");	}	/**	 * @see org.xml.sax.ErrorHandler#fatalError(SAXParseException)	 */	public void fatalError(SAXParseException exception) throws SAXException {		//System.out.println("fatal error");	}	/**	 * @see org.xml.sax.ContentHandler#ignorableWhitespace(char[], int, int)	 */	public void ignorableWhitespace(char[] ch, int start, int length) throws SAXException {		//System.out.println("ignorableWhitespace");	}	/**	 * @see org.xml.sax.DTDHandler#notationDecl(String, String, String)	 */	public void notationDecl(String name, String publicId, String systemId) throws SAXException {		//System.out.println("notationDecl");	}	/**	 * @see org.xml.sax.ContentHandler#processingInstruction(String, String)	 */	public void processingInstruction(String target, String data) throws SAXException {		//System.out.println("target= " + target + " data " + data);	}	/**	 * @throws SAXException	 * @throws IOException	 * @see org.xml.sax.EntityResolver#resolveEntity(String, String)	 */	public InputSource resolveEntity(String publicId, String systemId) throws IOException, SAXException {	//	System.out.println("resolveEntity" + publicId + systemId);	//	return new InputSource(systemId);		 return super.resolveEntity(publicId,systemId);	}	/**	 * @see org.xml.sax.ContentHandler#setDocumentLocator(Locator)	 */	public void setDocumentLocator(Locator locator) {		//System.out.println("setDocumentLocator" + locator.getPublicId() + locator.getSystemId());		super.setDocumentLocator(locator);	}	/**	 * @see org.xml.sax.ContentHandler#skippedEntity(String)	 */	public void skippedEntity(String name) throws SAXException {	//	System.out.println("skippedEntity");		super.skippedEntity(name);	}	/**	 * @see org.xml.sax.ContentHandler#startDocument()	 * as per bnf of wbxml...	 * ?? from where should the value for wbxml is taken??? application property??	 */	public void startDocument() throws SAXException {		//System.out.println("startDocument");		Token version = new Token("version",(byte)3);  // temporarily hardcoded to wbxml version 1.3		// TODO read wbxml version from externally either from propeerties file or from command line arguments		tokens.addElement(version);	}	/**	 * @see org.xml.sax.ContentHandler#startElement(String, String, String, Attributes)	 */	public void startElement(String namespaceURI, String localName, String qName, Attributes atts) throws SAXException {	//	System.out.println("startElement" + qName);		if (!publicIdTokenAdded) {// The document does not have Doctype Declaration which means Public ID 1 (for "UNKNOWN") should be addded			Token publicIdToken = new Token("publicid",(byte)1);			tokens.addElement(publicIdToken);			tokenRepository = TokenRepository.getInstance("1");			publicIdTokenAdded = true;		}		checkForParentTag();		boolean hasAttributes = atts.getLength() > 0;		createTagToken(localName, hasAttributes);		if (hasAttributes)			createAttributeTags(localName, atts);	}	private void checkForParentTag() {		// check if this element has a parent..		if (!parentTrace.isEmpty()) {			TagToken parentToken = (TagToken) parentTrace.pop();			if (parentToken != null) { // apply the bit mask for parent tag.				byte tokenValue = (byte) (parentToken.getValue() | parentBitMask);				parentToken.setValue(tokenValue);			}