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.concepts.fn;
25
26 import java.util.*;
27 import zeus.util.*;
28 import zeus.concepts.*;
29
30 public class TimeFn extends ValueFunction implements PrimitiveFn {
31 protected String arg = null;
32
33 public TimeFn(String arg) {
34 super(TIME,10);
35 int index1 = arg.indexOf(':');
36 int index2 = arg.indexOf(':',index1+1);
37 this.arg = (index2 == -1) ? arg + ":00" : arg;
38
39 if (index1 == 1)
40 this.arg = "0" + this.arg;
41 }
42 public ValueFunction mirror() {
43 return new TimeFn(arg);
44 }
45 public String toString() {
46 return arg;
47 }
48 Object getArg(int position) {
49 if (position != 0) throw new ArrayIndexOutOfBoundsException(position);
50 return arg;
51 }
52 public boolean isDeterminate() {
53 return true;
54 }
55 public boolean equals(Object any) {
56 if ( !(any instanceof TimeFn) ) return false;
57 TimeFn fn = (TimeFn)any;
58 return arg.equals(fn.getArg());
59 }
60 public boolean less(Object any) {
61 // date comparison not yet defined
62 return false;
63 }
64 ValueFunction unify(ValueFunction fn, Bindings b) {
65 return null;
66 }
67 public boolean references(ValueFunction var) {
68 return false;
69 }
70 }