inetaddressencoder.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/InetAddressEncoder.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 java.net.InetAddress;

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;

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

	public InetAddressEncoder() {
		all_.add( InetAddress.class );
	}

	public EncObject encode( Object obj, Object hint, boolean s ) {
		// default encoding is symbol unless an alternative type is specified
		// Only a cceptable alternative is String
		// An alternative hint can specify whethre to encode the numerical address
		// or the domain name.
		
		EncObject eo = null;
		CacheKey key = new CacheKey( obj, hint );
		
		if ( (eo = (EncObject)cache_.get( key )) == null ) {

			InetAddress ad = (InetAddress)obj;
			EncObjectType t = (hint == null || !EncObjectType.String.equals( hint )) ? 
				EncObjectType.Symbol : (EncObjectType)hint;
			
			eo = (EncObject)cache_.try_put( key, new 
				EncObjectImp( t, "name".equals( hint ) ?
							  ad.getHostName().getBytes() :
							  ad.getHostAddress().getBytes() ) );
			
		}
		
		return s ? sign( eo ) : eo;
	}

}