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


1 /******************************************************************
2  * File: MakeTemp.java
3  * Created by: Dave Reynolds
4  * Created on: 13-Apr-03
5  *
6  * (c) Copyright 2003, 2004, 2005 Hewlett-Packard Development Company, LP
7  * [See end of file]
8  * $Id: MakeTemp.java,v 1.7 2005/02/21 12:17:29 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  * Create a new anonymous node and bind it to the each argument
17  *
18  * @author <a HREF="mailto:der@hplb.hpl.hp.com">Dave Reynolds</a>
19  * @version $Revision: 1.7 $ on $Date: 2005/02/21 12:17:29 $
20  */
21 public class MakeTemp 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 "makeTemp";
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         for (int i = 0; i < length; i++) {
43             if (!context.getEnv().bind(args[i], Node.createAnon())) return false;
44         }
45         return true;
46     }
47     
48     
49     /**
50      * This method is invoked when the builtin is called in a rule head.
51      * Such a use is only valid in a forward rule.
52      * Exected args are the instance to be annotated, the property to use and the type
53      * of the resulting bNode.
54      * @param args the array of argument values for the builtin, this is an array
55      * of Nodes.
56      * @param context an execution context giving access to other relevant data
57      */
58     public void headAction(Node[] args, RuleContext context) {
59         // Can't be used in the head
60 throw new BuiltinException(this, context, "can't do " + getName() + " in rule heads");
61     }
62 }
63
64 /*
65     (c) Copyright 2003, 2004, 2005 Hewlett-Packard Development Company, LP
66     All rights reserved.
67
68     Redistribution and use in source and binary forms, with or without
69     modification, are permitted provided that the following conditions
70     are met:
71
72     1. Redistributions of source code must retain the above copyright
73        notice, this list of conditions and the following disclaimer.
74
75     2. Redistributions in binary form must reproduce the above copyright
76        notice, this list of conditions and the following disclaimer in the
77        documentation and/or other materials provided with the distribution.
78
79     3. The name of the author may not be used to endorse or promote products
80        derived from this software without specific prior written permission.
81
82     THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
83     IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
84     OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
85     IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
86     INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
87     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
88     DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
89     THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
90     (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
91     THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
92 */
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