requestpattern.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/engine/RequestPattern.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.engine;

import jacomma.util.Environment;
import jacomma.util.Cache;
import java.net.InetAddress;

import jacomma.icm.type.Handle;
import jacomma.icm.type.Symbol;
import jacomma.icm.type.Request;
import jacomma.icm.type.Message;
import jacomma.platform.core.MessagePattern;

import java.util.List;


/**
 * TBA
 **/
public final class RequestPattern {
	
	static Cache cache_ = new Cache();
	
	static MessagePattern createListPattern( Symbol sym ) {
		return createListPattern( Request.commServer, sym );
	}
	
	static MessagePattern createListPattern( InetAddress where, Symbol sym ) {
		return createListPattern( Handle.createHandle( Request.icmCommServer, where ), sym );
	}

	static MessagePattern createListPattern( Handle han, final Symbol sym ) {
		MessagePattern p = (MessagePattern)cache_.get( sym );
		if ( p == null ) {
			Object test = new Object(){ 
					public boolean equals( Object obj ) {
						try {
							return ((List)((Message)obj).getContent()).contains( sym );
						} catch ( ClassCastException exc ) {
							return false;
						}
					} 
				};
			p = (MessagePattern)cache_.try_put( sym, MessagePattern
												.createPattern( han, List.class, test ) );
		}
		
		return p;
	}
	
	static MessagePattern createListPattern( InetAddress where, Symbol sym, 
											 Object add_test ) {
		return createListPattern( Request.commServerAt( where ), 
								  sym, add_test );
	}
	
	static MessagePattern createListPattern( Symbol sym, Object add_test ) {
		return createListPattern( Request.commServer, sym, add_test );
	}

	static MessagePattern createListPattern( Handle han, final Symbol sym, 
											 final Object add_test ) {
		Object test = new Object(){ 
				public boolean equals( Object obj ) {
					try {
						return ((List)((Message)obj).getContent()).contains( sym )
							&& add_test.equals( obj );
					} catch ( ClassCastException exc ) {
						return false;
					}
				}
			};
		return MessagePattern.createPattern( han, List.class, test );
	}

	static MessagePattern createSymbolPattern( Symbol sym ) {
		return createSymbolPattern( Request.commServer, sym );
	}
	
	static MessagePattern createSymbolPattern( InetAddress where, Symbol sym ) {
		return createSymbolPattern( Handle.createHandle( Request.icmCommServer, where ), 
									sym );
	}
	
	static MessagePattern createSymbolPattern( Handle han, final Symbol sym ) {
		MessagePattern p = (MessagePattern)cache_.get( sym );
		if ( p == null ) {
			Object test = new Object(){ 
					public boolean equals( Object obj ) {
						try {
							return ((Message)obj).getContent().equals( sym );
						} catch ( ClassCastException exc ) {
							return false;
						}
					} 
				};
			p = (MessagePattern)cache_.try_put( sym, MessagePattern
												.createPattern( han, Symbol.class, test ) );
		}
		
		return p;
	}

}