mapentryencoder.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/MapEntryEncoder.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.ObjectEncoder;
import jacomma.icm.io.EncObjectSignature;

import java.util.Map;

/**
 * TBA
 **/
public class MapEntryEncoder extends EncoderTemplate {

	public MapEntryEncoder() {
		all_.add( Map.Entry.class );
	}

	public EncObject encode( Object obj, Object hint, boolean s ) {
		// hint: can be a signature string
		// The entry is encoded as a tuple
		Map.Entry entry = (Map.Entry)obj;
		CacheKey key = new CacheKey( obj, hint );
		EncObject eo = (EncObject)cache_.get( key );

		if ( eo == null ) {
			EncObject[] encentry = new EncObject[2];
			
			encentry[0] = Registry.instance.getEncoder( entry.getKey() ).encode( entry.getKey() );
			encentry[1] = Registry.instance.getEncoder( entry.getValue() ).encode( entry.getValue() );
			eo = Registry.instance.getEncoder( encentry ).encode( encentry,EncObjectType.Tuple );
			if ( hint instanceof String )
				eo.setSignature( (String)hint );
			eo = (EncObject)cache_.try_put( key, eo );
		}
			

		
		return s ? sign( eo ) : eo;
		
	}

}