xmlwriter.java

是一个JABBER的J2ME的实现

/*
 * Copyright 2004 Grzegorz Grasza [e-mail]
 *
 * This file is part of mobber. Mobber 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.
 * Mobber 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 mobber;
 * if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307 USA .
 */

package utils;

import java.io.*;
import java.util.*;

public class XmlWriter extends OutputStreamWriter
{
	Stack tags;
	boolean inside_tag;

	public XmlWriter(OutputStream out) throws UnsupportedEncodingException
	{
		super(out, "UTF-8");
		tags=new Stack();
		inside_tag=false;
	}
	
	public void flush() throws IOException
	{
		if(inside_tag)
		{
			write('>'); // prevent Invalid XML fatal error
			inside_tag=false;
		}
		super.flush();
	}
	
	public void startTag(String tag) throws IOException
	{
		if(inside_tag) write('>');
		
		write('<');
		write(tag);
		tags.push(tag);
		inside_tag=true;
	}
	
	public void attribute(String atr, String value) throws IOException
	{
		if(value==null) return;
		write(' ');
		write(atr);
		write("=\'");
		writeEscaped(value);
		write('\'');
	}

	public void endTag() throws IOException {
		try
		{
			String tagname=(String)tags.pop();
			if(inside_tag)
			{
				write("/>");
				inside_tag=false;
			}
			else
			{
				write("</");
				write(tagname);
				write('>');
			}
		}
		catch(EmptyStackException e) {}
	}
	
	public void text(String str) throws IOException
	{
		if(inside_tag)
		{
			write('>');
			inside_tag=false;
		}
		writeEscaped(str);
	}
	
	private void writeEscaped(String str) throws IOException
	{
		int index=0;
		for(int i=0; i<str.length(); i++)
		{
			char c=str.charAt(i);
			switch(c)
			{
				case '<': write("&lt;");
				case '>': write("&gt;");
				case '&': write("&amp;");
				case '\'': write("&apos;");
				case '"': write("&quot;");
				default: write(c);
			}
		}
	}
};