seqpattern.java

移动Agent编程工具Naplet

/*
 * @<#>SeqPattern.java version 0.0.1, 1/1/2000
 *
 * THIS PROGRAM IS FREE SOFTWARE; YOU CAN DISTRIBUTED IT AND/OR
 * MODIFY IT UNDER THE TERMS OF THE GNU GENERAL PUBLIC LICENSE 
 * AS PUBLISHED BY THE FREE SOFTWARE FOUNDATION.
 *
 * THIS PROGRAM 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 GENERAL PUBLIC LICENSE FOR MORE DETAILS.
 *
 * Copyright (c) 2000 Wayne State University. All Rights Reserved.
 */
package naplet.itinerary;

import naplet.*;

/**
 * <code>SeqPattern</code> class defines a primitive of sequential
 * itinerary, along which naplet is passed. 
 *
 * @version 0.0.1, 1/1/2000
 * @author C. Xu
 */

public class SeqPattern extends CompositePattern {

	public SeqPattern(ItineraryPattern[] itin) {
 		super(null, itin, null );
	}

	public SeqPattern(Checkable guard, ItineraryPattern[] itin ) {
		super(guard, itin, null);
	}

	public SeqPattern(ItineraryPattern[] itin, Operable act) {
		super(null, itin, act);
	}

	public SeqPattern(Checkable guard, ItineraryPattern[] itin, Operable act) {
		super(guard, itin, act);
	}

	public SeqPattern(String[] hosts)
			throws InvalidItineraryException {
		super(null, hosts, null);
	}

	public SeqPattern(String[] hosts, Operable act)
			throws InvalidItineraryException {
		super(null, hosts, act);
	}

	public SeqPattern(Checkable guard, String[] hosts )
			throws InvalidItineraryException {
		super(guard, hosts, null);
	}

	public SeqPattern(Checkable guard, String[] hosts, Operable act)
			throws InvalidItineraryException {
		super(guard, hosts, act);
			
	}
	public void go( Naplet nap )
		throws java.rmi.RemoteException, UnableDispatchException {


		if (iter.hasNext()) {

			ItineraryPattern next = iter.next();
	
			// Conditional visit of the sequence	
			if (guard==null || guard.check(nap) ) {	
				nap.getItinerary().pushRoute( this ); 
				nap.getItinerary().setRoute( next );
				next.go(nap);
			} else  { 		// skip the sequence
				ItineraryPattern itin = nap.getItinerary().popRoute();
				if (itin==null) {
					System.out.println("End of itinerary: SeqItineary");
				} else {		
					nap.getItinerary().setRoute( itin );
					itin.go(nap);
				}
			}	
		} else {
			if (action!=null) { 
				action.operate( nap );
			}

			// Reset the iterator for repetition over the itineary	
			iter.reset(); 

			ItineraryPattern itin = nap.getItinerary().popRoute();
			if (itin==null) {
				System.out.println("End of itinerary: SeqItineary");
			} else {		
				nap.getItinerary().setRoute( itin );
				itin.go(nap);
			}
		}
	}  

}