messagepattern.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/platform/core/MessagePattern.java,v $
 * $Revision: 1.6 $
 * $Date: 2000/10/28 20:09:08 $
 *
 * 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.platform.core;

import jacomma.icm.type.Message;
import jacomma.icm.type.Handle;
import jacomma.util.TypeIterator;

import java.util.List;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.Map;

import java.io.Serializable;

/**
 * TBA
 **/
public final class MessagePattern implements Cloneable, Serializable {
	
	public static final String Any = "any";
	public static final String All = Any + ":" + Any;

	static final MessagePattern anyp_;

	Object test_;
	List keys_;

	public MessagePattern( Object test, List keys) {
		test_ = test;
		keys_ = keys;
	}

	public List keys() { return keys_; }

	public boolean matches( Message msg ) {
		return test_.equals( msg );
	}

	public Object clone() {
		try {
			return super.clone();
		} catch ( CloneNotSupportedException exc ) {
			throw new jacomma.util.CheckedException( exc );
		}
	}
	
	static final ArrayList dflt_;
	
	static {
		dflt_ = new ArrayList();
		dflt_.add( All );
		anyp_ = new MessagePattern( new Serializable() {
				public boolean equals( Object obj ) {
					return true;
					}
				}, (List)dflt_.clone() );
	}

	public static MessagePattern anyPattern() {
		return anyp_;
	}

	public static MessagePattern createPattern( Object test ) {
		return new MessagePattern( test, (List)dflt_.clone() );
	}

	public static MessagePattern createPattern( Class c, Object test ) {
		return new MessagePattern( test, makeKeys( c ) );
	}

	public static MessagePattern createPattern( Handle from, Object test ) {
		return new MessagePattern( test, makeKeys( from ) );
	}

	public static MessagePattern createPattern( Handle from, Class c, Object test ) {
		return new MessagePattern( test, makeKeys( from, c ) );
	}

	public static List makeKeys( Handle from ) {
		List l = new ArrayList();
		l.add( from.id() + ":" + Any );
		l.add( All );
		
		return l;
	}
	
	public static List makeKeys( Class c ) {
		List l = new ArrayList();
		for( TypeIterator tit = new TypeIterator( c );
			 tit.hasNext();
			 l.add( Any + ":" + tit.nextType().getName() ) );
		l.add( All );
		
		return l;
	}

	public static List makeKeys( Message msg ) {
		return makeKeys( msg.getSender(), msg.getContent().getClass() );
	}

	public static List makeKeys( Handle from, Class cnt  ) {
		List l = new ArrayList();
		String s = from.id();
		TypeIterator tit = new TypeIterator( cnt );
		while( tit.hasMoreTypes() ) {
			String c = tit.nextType().getName();
			l.add( s + ":" + c );
			l.add( Any + ":" + c );
		}
		l.add( s + ":" + MessagePattern.Any );
		l.add( All );
		
		return l;
	}
	
}