Source Code Cross Referenced for EnvironmentFrame.java in  » RSS-RDF » Jena-2.5.5 » com » hp » hpl » jena » reasoner » rulesys » impl » 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 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /******************************************************************
002:         * File:        LPEnvironment.java
003:         * Created by:  Dave Reynolds
004:         * Created on:  22-Jul-2003
005:         * 
006:         * (c) Copyright 2003, 2004, 2005, 2006, 2007, 2008 Hewlett-Packard Development Company, LP
007:         * [See end of file]
008:         * $Id: EnvironmentFrame.java,v 1.7 2008/01/02 12:06:16 andy_seaborne Exp $
009:         *****************************************************************/package com.hp.hpl.jena.reasoner.rulesys.impl;
010:
011:        import com.hp.hpl.jena.graph.*;
012:        import com.hp.hpl.jena.reasoner.rulesys.Rule;
013:
014:        /**
015:         * Represents a single frame in the LP interpreter's environment stack. The
016:         * environment stack represents the AND part of the search tree - it is a sequence
017:         * of nested predicate calls.
018:         * <p>
019:         * This is used in the inner loop of the interpreter and so is a pure data structure
020:         * not an abstract data type and assumes privileged access to the interpreter state.
021:         * </p>
022:         * 
023:         * @author <a href="mailto:der@hplb.hpl.hp.com">Dave Reynolds</a>
024:         * @version $Revision: 1.7 $ on $Date: 2008/01/02 12:06:16 $
025:         */
026:        public class EnvironmentFrame extends FrameObject {
027:
028:            /** The set of permanent variables Y(i) in use by this frame.  */
029:            Node[] pVars;
030:
031:            /** The code the the clause currently being processed */
032:            RuleClauseCode clause;
033:
034:            /** The continuation program counter offet in the parent clause's byte code */
035:            int cpc;
036:
037:            /** The continuation argument counter offset in the parent clause's arg stream */
038:            int cac;
039:
040:            /** 
041:             * Constructor 
042:             * @param clause the compiled code being interpreted by this env frame 
043:             */
044:            public EnvironmentFrame(RuleClauseCode clause) {
045:                this .clause = clause;
046:            }
047:
048:            /**
049:             * Allocate a vector of permanent variables for use in the rule execution.
050:             */
051:            public void allocate(int n) {
052:                pVars = new Node[n];
053:            }
054:
055:            /**
056:             * Return the rule associated with this environment, null if no such rule.
057:             */
058:            public Rule getRule() {
059:                if (clause != null) {
060:                    return clause.rule;
061:                } else {
062:                    return null;
063:                }
064:            }
065:
066:            /**
067:             * Printable string for debugging.
068:             */
069:            public String toString() {
070:                if (clause == null || clause.rule == null) {
071:                    return "[anon]";
072:                } else {
073:                    return "[" + clause.rule.toShortString() + "]";
074:                }
075:            }
076:        }
077:
078:        /*
079:         (c) Copyright 2003, 2004, 2005, 2006, 2007, 2008 Hewlett-Packard Development Company, LP
080:         All rights reserved.
081:
082:         Redistribution and use in source and binary forms, with or without
083:         modification, are permitted provided that the following conditions
084:         are met:
085:
086:         1. Redistributions of source code must retain the above copyright
087:         notice, this list of conditions and the following disclaimer.
088:
089:         2. Redistributions in binary form must reproduce the above copyright
090:         notice, this list of conditions and the following disclaimer in the
091:         documentation and/or other materials provided with the distribution.
092:
093:         3. The name of the author may not be used to endorse or promote products
094:         derived from this software without specific prior written permission.
095:
096:         THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
097:         IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
098:         OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
099:         IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
100:         INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
101:         NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
102:         DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
103:         THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
104:         (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
105:         THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
106:         */
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