01: /******************************************************************
02: * File: GreaterThan.java
03: * Created by: Dave Reynolds
04: * Created on: 24-Aug-2003
05: *
06: * (c) Copyright 2003, 2004, 2005, 2006, 2007, 2008 Hewlett-Packard Development Company, LP
07: * [See end of file]
08: * $Id: GreaterThan.java,v 1.9 2008/01/02 12:06:21 andy_seaborne Exp $
09: *****************************************************************/package com.hp.hpl.jena.reasoner.rulesys.builtins;
10:
11: import com.hp.hpl.jena.reasoner.rulesys.*;
12: import com.hp.hpl.jena.graph.*;
13:
14: //Thanks to Bradley Schatz (Bradley@greystate.com) for code patches
15: //to support XSDDateTime comparisons
16:
17: /**
18: * Tests if the first argument is greater than the second.
19: *
20: * @author <a href="mailto:der@hplb.hpl.hp.com">Dave Reynolds</a>
21: * @version $Revision: 1.9 $ on $Date: 2008/01/02 12:06:21 $
22: */
23: public class GreaterThan extends BaseBuiltin {
24:
25: /**
26: * Return a name for this builtin, normally this will be the name of the
27: * functor that will be used to invoke it.
28: */
29: public String getName() {
30: return "greaterThan";
31: }
32:
33: /**
34: * Return the expected number of arguments for this functor or 0 if the number is flexible.
35: */
36: public int getArgLength() {
37: return 2;
38: }
39:
40: /**
41: * This method is invoked when the builtin is called in a rule body.
42: * @param args the array of argument values for the builtin, this is an array
43: * of Nodes, some of which may be Node_RuleVariables.
44: * @param context an execution context giving access to other relevant data
45: * @return return true if the buildin predicate is deemed to have succeeded in
46: * the current environment
47: */
48: public boolean bodyCall(Node[] args, int length, RuleContext context) {
49: checkArgs(length, context);
50: Node n0 = getArg(0, args, context);
51: Node n1 = getArg(1, args, context);
52: if (Util.isNumeric(n0) && Util.isNumeric(n1)) {
53: return Util.compareNumbers(n0, n1) > 0;
54: } else if (Util.isInstant(n0) && Util.isInstant(n1)) {
55: return Util.compareInstants(n0, n1) > 0;
56: } else {
57: return false;
58: }
59: }
60:
61: }
62:
63: /*
64: (c) Copyright 2003, 2004, 2005, 2006, 2007, 2008 Hewlett-Packard Development Company, LP
65: All rights reserved.
66:
67: Redistribution and use in source and binary forms, with or without
68: modification, are permitted provided that the following conditions
69: are met:
70:
71: 1. Redistributions of source code must retain the above copyright
72: notice, this list of conditions and the following disclaimer.
73:
74: 2. Redistributions in binary form must reproduce the above copyright
75: notice, this list of conditions and the following disclaimer in the
76: documentation and/or other materials provided with the distribution.
77:
78: 3. The name of the author may not be used to endorse or promote products
79: derived from this software without specific prior written permission.
80:
81: THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
82: IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
83: OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
84: IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
85: INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
86: NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
87: DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
88: THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
89: (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
90: THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
91: */
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