1 /*
2 * The contents of this file are subject to the BT "ZEUS" Open Source
3 * Licence (L77741), Version 1.0 (the "Licence"); you may not use this file
4 * except in compliance with the Licence. You may obtain a copy of the Licence
5 * from $ZEUS_INSTALL/licence.html or alternatively from
6 * http://www.labs.bt.com/projects/agents/zeus/licence.htm
7 *
8 * Except as stated in Clause 7 of the Licence, software distributed under the
9 * Licence is distributed WITHOUT WARRANTY OF ANY KIND, either express or
10 * implied. See the Licence for the specific language governing rights and
11 * limitations under the Licence.
12 *
13 * The Original Code is within the package zeus.*.
14 * The Initial Developer of the Original Code is British Telecommunications
15 * public limited company, whose registered office is at 81 Newgate Street,
16 * London, EC1A 7AJ, England. Portions created by British Telecommunications
17 * public limited company are Copyright 1996-9. All Rights Reserved.
18 *
19 * THIS NOTICE MUST BE INCLUDED ON ANY COPY OF THIS FILE
20 */
21
22
23 package zeus.rete.action;
24 import zeus.rete.*;
25 import zeus.concepts.*;
26 import zeus.concepts.fn.*;
27 import zeus.util.*;
28
29 /***
30
31 @author Simon Thompson
32 @since 1.1
33 */
34 public class WhileAction extends ReteAction{
35
36 /***
37
38 */
39 public void executeAction (Action a, Info info) {
40 while( true ) {
41 ValueFunction var = ((ValueFunction)a.head).resolve(info.getBindings());
42 if ( var == null || var.getID() != ValueFunction.BOOL ) {
43 Core.USER_ERROR("Cannot resolve '" + a.head + "' in action " + a);
44 return;
45 }// end if
46 if ( ((BoolFn)var).getValue() ) {
47 for(int i = 0; i < a.items.size(); i++ ) {
48 AbstractActionFactory actionFact = new AbstractActionFactory();
49 ActionFactory factory = actionFact.getActionFactory ();
50 try {
51 Action b = (Action)a.items.elementAt(i);
52 // System.out.println("generating action");
53 BasicAction action = factory.getAction(b.type);
54 action.setActuators(this.conflictHandler,context);
55 // System.out.println("Action was : " + action.toString());
56 action.executeAction (b,info); }
57 catch (Exception e) {
58 e.printStackTrace(); }
59
60 }// end for
61 }// end if
62 }// end while
63
64 }// end executeAction
65
66
67 }