signeddecoder.java

来自「Java Communicating Agents是一个用于开发网络反应式信息a」· Java 代码 · 共 66 行

/*
 * $Source: /home/data/cvsroot/src/jacomma/icm/io/imp/SignedDecoder.java,v $
 * $Revision: 1.3 $
 * $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;

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

	public SignedDecoder() {
		all_.add( EncObjectType.Signed );
	}

	public Object decode( EncObject obj, Object hint ) {
		// hint is passed along to the content decoder

		CacheKey key = new CacheKey( obj, hint );
		Object dobj = cache_.get( key );		
		if ( dobj == null ) {
			EncObject encsig = ((EncObject[])obj.getValue())[0];
			EncObject val = ((EncObject[])obj.getValue())[1];
			val.setSignature( (String)Registry.instance.getDecoder( encsig )
							  .decode( encsig ) );
			dobj = cache_.try_put( key, 
								   Registry.instance.getDecoder( val ).decode( val, hint ) );
		}
		
		return dobj;
		
	}

}