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;
25
26 import java.util.*;
27 import zeus.util.*;
28 import zeus.concepts.*;
29 import gnu.regexp.*;
30
31
32 public class AttributeNode extends MsgNode {
33 RE value = null;
34 String attribute = null;
35
36
37 // meaningless init to allow rearch
38 public AttributeNode () {
39 ;}
40
41
42 AttributeNode(MsgHandler engine, String attribute, RE value) {
43 super(engine);
44 this.attribute = attribute;
45 this.value = value;
46 }
47 void evaluate(String path, Performative input) {
48 Object s = input.getAttribute(attribute);
49 if ( s == null ) s = "";
50 if ( value.isMatch(s.toString()) ) { // was isMatch
51 Core.DEBUG(5,"Matched " + value + " with " + s);
52 propagate(path,input);
53 }
54 else
55 Core.DEBUG(5,"Matched failed " + value + " <> " + s);
56 }
57 public boolean equals(Object any) {
58 if ( any instanceof AttributeNode ) {
59 AttributeNode node = (AttributeNode)any;
60 return attribute.equals(node.attribute) && value.equals(node.value);
61 }
62 return false;
63 }
64 void remove(String path) {
65 super.remove(path);
66 if ( use_count == 0 )
67 engine.attributeNodes.removeElement(this);
68 }
69 public String toString() {
70 return "AttributeNode(" + attribute + "," + value + ")";
71 }
72 }