tagwriter.java

Java Communicating Agents是一个用于开发网络反应式信息agent的框架

/*
 * $Source: /home/data/cvsroot/src/jacomma/icm/io/imp/TagWriter.java,v $
 * $Revision: 1.6 $
 * $Date: 2000/10/28 20:09:07 $
 *
 * This file is part of the jacomma framework
 * Copyright (c) 2000 	Dimitrios Vyzovitis
 *			mailto:[e-mail]
 *			
 *
 *			
 *			
 *			
 *
 *	This library is free software; you can redistribute it and/or modify
 *	it under the terms of the GNU Library General Public License as published by
 *	the Free Software Foundation; either version 2 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 Library General Public License for more details.
 *
 *	You should have received a copy of the GNU Library 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 jacomma.icm.io.imp;

import jacomma.icm.io.EncObject;
import jacomma.icm.io.EncObjectType;
import jacomma.icm.io.EncObjectWriter;


public class TagWriter extends WriterTemplate {

	EncObject val_;
	byte[] key_;

	public TagWriter(){}

	public void start( EncObject obj, java.io.OutputStream stream ) 
		throws java.io.IOException {
		
		super.start( obj, stream );

		key_ = (byte[])((Object[])obj_.getValue())[0];
		val_ = (EncObject)((Object[])obj_.getValue())[1];
	}

	public void writeNext() throws java.io.IOException {
		if ( !done_ ) {
			// signature
			stream_.write( obj_.getType().getByteCode() | key_.length );
			stream_.write( key_ );

			// value
			EncObjectWriter wr = Registry.instance.getWriter( val_.getType() );
			for( wr.start( val_, stream_ ); wr.hasNext(); wr.writeNext() );
			wr.putObject();

			done_ = true;
		}
		
	}


	public boolean canHandle( EncObjectType t ) {
		return EncObjectType.Tag.equals( t );
	}


}