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 @author Simon Thompson
31 @since 1.1
32 */
33 public class RetractAction extends ReteAction {
34
35 /***
36 Action that retracts a fact from a zeus.concepts.ResourceDb base
37 */
38 public void executeAction (Action a, Info info) {
39 for(int j = 0; j < a.items.size(); j++ ) {
40 ValueFunction var = (ValueFunction)a.items.elementAt(j);
41 ValueFunction type_var = var.resolve(info.getBindings());
42 // type == 3 and id = 1... I'm not sure what this test is for, but it always fails...
43 System.out.println ("type_var.getID() == " + type_var.getID());
44 System.out.println ("ValueFunction.TYPE == " + ValueFunction.TYPE);
45 Assert.notFalse(type_var.getID() == ValueFunction.TYPE);
46 boolean found = false;
47 for(int k = 0; ! found && k < info.getInput().size(); k++ ) {
48 Fact f1 = (Fact)info.getInput().elementAt(k);
49 found = (f1.functor()).equals(type_var);
50 if ( found ) {
51 Core.DEBUG(2," <== " + f1);
52 retract(f1);
53 }// end if
54 } // end for
55 Assert.notFalse(found);
56 }// end for
57 }
58
59
60
61 private void retract(Fact f1) {
62 if ( context == null )
63 engine.update(Node.REMOVE,f1);
64 else
65 context.ResourceDb().del(f1);
66 }
67
68
69 }