serializeddecoder.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/SerializedDecoder.java,v $
 * $Revision: 1.4 $
 * $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.EncObjectDecoder;
import jacomma.icm.io.EncObjectSignature;

import java.io.ByteArrayInputStream;
import java.io.ObjectInputStream;

/**
 * TBA
 **/
public class SerializedDecoder extends DecoderTemplate {

	public SerializedDecoder() {
		all_.add( EncObjectType.Code );
	}

	public Object decode( EncObject obj, Object hint ) {
		try {
			// hint: ignored
			// Throws a jacomma.icm.io.IOException if deserialization fails
			
			CacheKey key = new CacheKey( obj );
			
			Object dobj = cache_.get( key );		
			if ( dobj == null ) {
				ByteArrayInputStream bin = new ByteArrayInputStream( (byte[])obj.getValue() );
				dobj = cache_.try_put( key, new ObjectInputStream( bin ).readObject() );
			}
			
			return dobj;
		} catch ( java.io.IOException exc ) {
			throw new jacomma.icm.io.DecodingFailedException( exc, obj );
		} catch ( ClassNotFoundException exc ) {
			throw new jacomma.icm.io.DecodingFailedException( exc, obj );
		}

		
	}

}