listwriter.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/ListWriter.java,v $
 * $Revision: 1.7 $
 * $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 ListWriter extends WriterTemplate {

	EncObject[] elements_;
	EncObjectWriter wr_;
	int index_;

	public ListWriter(){}

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

		elements_ = (EncObject[])obj_.getValue();
		if ( elements_.length > 0 )
			wr_ = Registry.instance.getWriter( elements_[0].getType() );
		index_ = 0;
	}

	public void writeNext() throws java.io.IOException {
			
		if ( index_ < elements_.length ) {
			stream_.write( obj_.getType().getByteCode() | 0x01 );
			for( wr_.start( elements_[index_++], stream_ ); 
				 wr_.hasNext(); 
				 wr_.writeNext() );
			wr_.putObject();
			
		} else if ( !done_ ) {
			stream_.write( obj_.getType().getByteCode() );
			done_ = true;
		}
	}
	
	
	public boolean canHandle( EncObjectType t ) {
		return EncObjectType.List.equals( t );
	}

}