booleandecoder.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/BooleanDecoder.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;

import jacomma.icm.type.Symbol;

import java.io.StringWriter;

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

	public BooleanDecoder() {
		some_.add( EncObjectType.Symbol );
	}
	
	public boolean canHandle( EncObject obj ) {
		return EncObjectSignature.Logical.equals( obj.getSignature() );
	}
	

	public Object decode( EncObject obj, Object hint ) {
		// hint is ignored
		CacheKey key = new CacheKey( obj );

		Boolean s = (Boolean)cache_.get( key );		
		if ( s == null ) {
			EncObjectDecoder dec = Registry.instance.getDecoder( EncObjectType.Symbol );
			s = (Boolean)cache_.try_put( key, new Boolean( dec.decode( obj ).toString() ) );
		}
		
		return s;
		
	}

}