messageencoder.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/MessageEncoder.java,v $
 * $Revision: 1.12 $
 * $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.Message;
import jacomma.icm.type.Handle;
import jacomma.icm.type.Symbol;

import java.util.ArrayList;
import java.net.InetAddress;

/**
 * TBA
 **/
public class MessageEncoder extends EncoderTemplate {
	
	String optsig_ = EncObjectSignature.Tuple + "\002" + EncObjectSignature.Symbol + EncObjectSignature.Any;

	ObjectEncoder henc_;
	// Note a signature String can that represents the icm message options type
	// can be supplied to the Map encoder that encodes them.
	// however, the icm Header files depart from the protocol spec - thus making
	// unclear the right use.
	// This should be resolved int future releases.
	
	public MessageEncoder() {
		all_.add( Message.class );
	}

	
	
	public EncObject encode( Object obj, Object hint, boolean s ) {
		// hint  and signature are passed to the content Encoder

		Message m = (Message)obj;
		CacheKey key = new CacheKey( obj, hint );
		EncObject eo = (EncObject)cache_.get( key );
		
		if ( eo == null ) {
			ObjectEncoder henc = Registry.instance.getEncoder( Handle.class );
			EncObject[] elements = new EncObject[4];
			elements[0] = henc.encode( m.getRecipient() );
			elements[1] = henc.encode( m.getSender() );
			elements[2] = Registry.instance.getEncoder( m.getOptions().toMap() ).encode( m.getOptions().toMap(), optsig_ );
			elements[3] = Registry.instance.getEncoder( m.getContent() ).encode( m.getContent(), hint, true ); // content is  signed by default
			
			eo = (EncObject)cache_.try_put( key, new 
				EncObjectImp( EncObjectType.Tuple, elements ) );

		}

		return s ? sign( eo ) : eo;
		
	}

}