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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  
24  package zeus.actors.graphs;
25  
26  import java.util.*;
27  import zeus.util.*;
28  import zeus.concepts.*;
29  import zeus.actors.*;
30  import zeus.actors.rtn.*;
31  import zeus.actors.rtn.util.*;
32  
33  public class Sb extends Node {
34     public Sb() {
35        super("Sb");
36     }
37  
38     // memory useful for backtracking
39  
40     protected int exec() {
41        // prepare output
42        Planner table = context.Planner();
43        Engine engine = context.Engine();
44  
45        //first perform join 
46        Object[] data = (Object[]) input;
47        GraphStruct gs = ((DStruct)data[0]).gs;
48        gs.d_results = new Vector();
49        for(int i = 0; i < data.length; i++ ) {
50           for(int j = 0; j < ((DStruct)data[i]).results.size(); j++ )
51              gs.d_results.addElement(((DStruct)data[i]).results.elementAt(j));
52        }
53  
54        Core.DEBUG(2,"Sb Input gs " + gs);
55  
56        BindResults b = table.bind(gs.goal,gs.d_results,Planner.REPLAN);
57  
58        Core.DEBUG(2,"Sb BindResults " + b);
59  
60        DelegationStruct s;
61        if ( !b.ok ) { // send-reject to all agents: they are all unselected
62           for( int i = 0; i < gs.d_results.size(); i++ ) {
63              s = (DelegationStruct) gs.d_results.elementAt(i);
64              engine.continue_dialogue(s.key,s.agent,"reject-proposal",s.goals);
65           }
66           return FAIL;
67        }
68  
69        gs.external = b.external;
70        gs.selection = Misc.union(gs.selection,b.selection);
71  
72        // send-reject to unselected agents
73        for(int i = 0; i < b.rejection.size(); i++ ) {
74           s = (DelegationStruct) b.rejection.elementAt(i);
75           engine.continue_dialogue(s.key,s.agent,"reject-proposal",s.goals);
76        }
77  
78        Core.DEBUG(2,"Sb Current gs " + gs);
79        output = gs;
80        return OK;
81     }
82     protected void reset() {
83        // reset any state changed by exec()
84        Object[] data = (Object[]) input;
85        GraphStruct gs = ((DStruct)data[0]).gs;
86        gs.d_results = null;
87     }
88  }