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Java > Open Source Codes > com > hp > hpl > jena > reasoner > rulesys > builtins > Bound


1 /******************************************************************
2  * File: Bound.java
3  * Created by: Dave Reynolds
4  * Created on: 11-May-2003
5  *
6  * (c) Copyright 2003, 2004, 2005 Hewlett-Packard Development Company, LP
7  * [See end of file]
8  * $Id: Bound.java,v 1.7 2005/02/21 12:17:09 andy_seaborne Exp $
9  *****************************************************************/
10 package com.hp.hpl.jena.reasoner.rulesys.builtins;
11
12 import com.hp.hpl.jena.reasoner.rulesys.*;
13 import com.hp.hpl.jena.graph.*;
14
15 /**
16  * Predicate used to check if a variable has been bound.
17  *
18  * @author <a HREF="mailto:der@hplb.hpl.hp.com">Dave Reynolds</a>
19  * @version $Revision: 1.7 $ on $Date: 2005/02/21 12:17:09 $
20  */
21 public class Bound extends BaseBuiltin {
22
23     /**
24      * Return a name for this builtin, normally this will be the name of the
25      * functor that will be used to invoke it.
26      */
27     public String JavaDoc getName() {
28         return "bound";
29     }
30
31     /**
32      * This method is invoked when the builtin is called in a rule body.
33      * @param args the array of argument values for the builtin, this is an array
34      * of Nodes, some of which may be Node_RuleVariables.
35      * @param length the length of the argument list, may be less than the length of the args array
36      * for some rule engines
37      * @param context an execution context giving access to other relevant data
38      * @return return true if the buildin predicate is deemed to have succeeded in
39      * the current environment
40      */
41     public boolean bodyCall(Node[] args, int length, RuleContext context) {
42         BindingEnvironment env = context.getEnv();
43         for (int i = 0; i < length; i++) {
44             if (getArg(i, args, context) instanceof Node_RuleVariable) return false;
45         }
46         return true;
47     }
48  
49 }
50
51
52
53 /*
54     (c) Copyright 2003, 2004, 2005 Hewlett-Packard Development Company, LP
55     All rights reserved.
56
57     Redistribution and use in source and binary forms, with or without
58     modification, are permitted provided that the following conditions
59     are met:
60
61     1. Redistributions of source code must retain the above copyright
62        notice, this list of conditions and the following disclaimer.
63
64     2. Redistributions in binary form must reproduce the above copyright
65        notice, this list of conditions and the following disclaimer in the
66        documentation and/or other materials provided with the distribution.
67
68     3. The name of the author may not be used to endorse or promote products
69        derived from this software without specific prior written permission.
70
71     THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
72     IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
73     OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
74     IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
75     INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
76     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
77     DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
78     THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
79     (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
80     THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
81 */
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