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.rete;
25
26 import java.util.*;
27 import zeus.util.*;
28 import zeus.concepts.*;
29
30
31 public abstract class Node {
32 public static final int ADD = 0;
33 public static final int REMOVE = 1;
34
35 static final int SINGLE = 0;
36 static final int ACTION = 1;
37 static final int LEFT = 2;
38 static final int RIGHT = 3;
39
40 Hashtable successors = new Hashtable();
41 ReteEngine engine = null;
42 int use_count = 0;
43
44 Node(ReteEngine engine) {
45 this.engine = engine;
46 }
47
48 void addSuccessor(String path, Node node, int type) {
49 Assert.notFalse(successors.put(path,new Successor(node,type)) == null);
50 }
51
52 void propagate(String path, int tag, Vector input, Bindings b) {
53 Core.DEBUG(5,"\nPropagate: " + path + " " + this);
54 Successor s = (Successor)successors.get(path);
55 s.node.evaluate(path,tag,s.type,input,b);
56 }
57
58 abstract void evaluate(String path, int tag, int type,
59 Vector input, Bindings b);
60 }