serializedencoder.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/SerializedEncoder.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 jacomma.icm.type.Symbol;

import java.io.ByteArrayOutputStream;
import java.io.ObjectOutputStream;

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

	public SerializedEncoder() {
		all_.add( java.io.Serializable.class );
	}

	public EncObject encode( Object obj, Object hint, boolean s ) {
		try {
			// default type is  Code
			// Can also be encoded as String
			CacheKey key = new CacheKey( obj, hint );
			EncObject eo = (EncObject)cache_.get( key );

			if ( eo == null ) {
				EncObjectType t = (hint == null || !EncObjectType.String.equals( hint ))
					? EncObjectType.Code : (EncObjectType)hint;
				
				ByteArrayOutputStream bs = new ByteArrayOutputStream();
				ObjectOutputStream oos = new ObjectOutputStream( bs );
				oos.writeObject( obj );
				oos.flush();
			
				eo = (EncObject)cache_.try_put( key, new 
					EncObjectImp( t, bs.toByteArray() ) );
			}
			
			return s ? sign( eo ) : eo;
		} catch ( java.io.IOException exc ) {
			exc.printStackTrace();
			throw new jacomma.icm.io.IOException( "Unable to serialize object: " + exc.getMessage(), exc );
		}
	}

}