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Java > Open Source Codes > com > hp > hpl > jena > reasoner > rulesys > impl > RDFSCMPPreprocessHook


1 /******************************************************************
2  * File: RDFSCMPPreprocessHook.java
3  * Created by: Dave Reynolds
4  * Created on: 19-Jun-2003
5  *
6  * (c) Copyright 2003, 2004, 2005 Hewlett-Packard Development Company, LP
7  * [See end of file]
8  * $Id: RDFSCMPPreprocessHook.java,v 1.5 2005/02/21 12:17:57 andy_seaborne Exp $
9  *****************************************************************/
10 package com.hp.hpl.jena.reasoner.rulesys.impl;
11
12 import com.hp.hpl.jena.reasoner.rulesys.*;
13 import com.hp.hpl.jena.reasoner.*;
14 import com.hp.hpl.jena.graph.*;
15 import com.hp.hpl.jena.vocabulary.RDF;
16 import com.hp.hpl.jena.vocabulary.RDFS;
17 import com.hp.hpl.jena.util.iterator.ExtendedIterator;
18
19 import java.util.*;
20
21 /**
22  * A rule preprocessor that scans all supplied data looking for instances
23  * of container membership properties and adds those to the deductions set.
24  *
25  * @author <a HREF="mailto:der@hplb.hpl.hp.com">Dave Reynolds</a>
26  * @version $Revision: 1.5 $ on $Date: 2005/02/21 12:17:57 $
27  */
28 public class RDFSCMPPreprocessHook implements RulePreprocessHook {
29
30     /**
31      * Invoke the preprocessing hook. This will be called during the
32      * preparation time of the hybrid reasoner.
33      * @param infGraph the inference graph which is being prepared,
34      * the hook code can use this to addDeductions or add additional
35      * rules (using addRuleDuringPrepare).
36      * @param dataFind the finder which packages up the raw data (both
37      * schema and data bind) and any cached transitive closures.
38      * @param inserts a temporary graph into which the hook should insert
39      * all new deductions that should be seen by the rules.
40      */
41     public void run(FBRuleInfGraph infGraph, Finder dataFind, Graph inserts) {
42         ExtendedIterator it = dataFind.find(new TriplePattern(null, null, null));
43         HashSet properties = new HashSet();
44         String JavaDoc memberPrefix = RDF.getURI() + "_";
45         while (it.hasNext()) {
46             Triple triple = (Triple)it.next();
47             Node prop = triple.getPredicate();
48             if (prop.equals(RDF.type.getNode()) && prop.equals(RDF.Property.getNode()) ) {
49                 prop = triple.getSubject();
50             }
51             if (properties.add(prop)) {
52                 if (prop.getURI().startsWith(memberPrefix)) {
53                     // A container property
54 inserts.add(new Triple(prop, RDF.type.getNode(), RDFS.ContainerMembershipProperty.getNode()));
55                 }
56             }
57         }
58     }
59
60 }
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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