handledecoder.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/HandleDecoder.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.EncObjectDecoder;
import jacomma.icm.io.EncObjectSignature;

import jacomma.icm.type.Symbol;
import jacomma.icm.type.Handle;

import java.net.InetAddress;
import java.util.List;

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

	public HandleDecoder() {
		all_.add( EncObjectType.Handle );
	}

	public Object decode( EncObject obj, Object hint ) {
		// hint is ignored

		CacheKey key = new CacheKey( obj );
		Handle dh = (Handle)cache_.get( key );		
		if ( dh == null ) {
			EncObject[] cmp = (EncObject[])obj.getValue();
			EncObjectDecoder sdec = Registry.instance.getDecoder( EncObjectType.Symbol );
			String target = EncObjectType.List.equals( cmp[0].getType() ) ?
				null : sdec.decode( cmp[0] ).toString();
			String name = sdec.decode( cmp[1] ).toString();
			EncObjectDecoder addec = Registry.instance.getDecoder( cmp[2], "InetAddress" );
			InetAddress home = (InetAddress)addec.decode( cmp[2], sdec );
			List locs = (List)Registry.instance.getDecoder( cmp[3] ).decode( cmp[3], addec );
			
			dh = (Handle)cache_.try_put( key, Handle.createHandle( target, name, home, locs ) );
			// pass the decoder along to the list decoder
			
		}
		
		return dh;
		
	}

}