Source Code Cross Referenced for RuleInstance.java in  » RSS-RDF » Jena-2.5.5 » com » hp » hpl » jena » reasoner » rulesys » impl » oldCode » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » RSS RDF » Jena 2.5.5 » com.hp.hpl.jena.reasoner.rulesys.impl.oldCode 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /******************************************************************
02:         * File:        RuleInstance.java
03:         * Created by:  Dave Reynolds
04:         * Created on:  03-May-2003
05:         * 
06:         * (c) Copyright 2003, 2004, 2005, 2006, 2007, 2008 Hewlett-Packard Development Company, LP
07:         * [See end of file]
08:         * $Id: RuleInstance.java,v 1.7 2008/01/02 12:09:44 andy_seaborne Exp $
09:         *****************************************************************/package com.hp.hpl.jena.reasoner.rulesys.impl.oldCode;
10:
11:        import com.hp.hpl.jena.reasoner.*;
12:        import com.hp.hpl.jena.reasoner.rulesys.*;
13:
14:        /**
15:         * Part of the backward chaining rule interpreter. A RuleInstance
16:         * links an instance of a rule to the GoalResults object for which it is
17:         * generating results. It is a simple data structure which is shared amongst
18:         * a set of RuleSets to reduce the store turn over needed for RuleState creation.
19:         * <p>
20:         * Encapuslation warning: this object is used in the tight inner loop of the engine so we access its
21:         * field pointers directly rather than through accessor methods.
22:         * </p>
23:         * 
24:         * @author <a href="mailto:der@hplb.hpl.hp.com">Dave Reynolds</a>
25:         * @version $Revision: 1.7 $ on $Date: 2008/01/02 12:09:44 $
26:         */
27:        public class RuleInstance {
28:
29:            /** The rule being processed */
30:            protected Rule rule;
31:
32:            /** The parent goal table entry which contains this continuation point */
33:            protected GoalResults generator;
34:
35:            /** The enclosing rule engine */
36:            protected BRuleEngine engine;
37:
38:            /** The head clause whose bindings are being sought */
39:            protected TriplePattern head;
40:
41:            /** Set to true if the first two body clauses were reordered for performance */
42:            protected boolean clausesReordered = false;
43:
44:            /** If the clauses are reordered this contains the index of the second clause */
45:            protected int secondClause = -1;
46:
47:            /**
48:             * Constructor. Create a new continuation point for a rule in
49:             * the context of a specific goal represented by the table entry.
50:             */
51:            RuleInstance(GoalResults results, Rule rule, TriplePattern head) {
52:                this .generator = results;
53:                this .rule = rule;
54:                this .engine = results.getEngine();
55:                this .head = head;
56:            }
57:
58:        }
59:
60:        /*
61:         (c) Copyright 2003, 2004, 2005, 2006, 2007, 2008 Hewlett-Packard Development Company, LP
62:         All rights reserved.
63:
64:         Redistribution and use in source and binary forms, with or without
65:         modification, are permitted provided that the following conditions
66:         are met:
67:
68:         1. Redistributions of source code must retain the above copyright
69:         notice, this list of conditions and the following disclaimer.
70:
71:         2. Redistributions in binary form must reproduce the above copyright
72:         notice, this list of conditions and the following disclaimer in the
73:         documentation and/or other materials provided with the distribution.
74:
75:         3. The name of the author may not be used to endorse or promote products
76:         derived from this software without specific prior written permission.
77:
78:         THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
79:         IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
80:         OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
81:         IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
82:         INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
83:         NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
84:         DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
85:         THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
86:         (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
87:         THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
88:         */
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