Source Code Cross Referenced for TopGoalIterator.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) 


001:        /******************************************************************
002:         * File:        TopGoalIterator.java
003:         * Created by:  Dave Reynolds
004:         * Created on:  30-May-2003
005:         * 
006:         * (c) Copyright 2003, 2004, 2005, 2006, 2007, 2008 Hewlett-Packard Development Company, LP
007:         * [See end of file]
008:         * $Id: TopGoalIterator.java,v 1.7 2008/01/02 12:09:45 andy_seaborne Exp $
009:         *****************************************************************/package com.hp.hpl.jena.reasoner.rulesys.impl.oldCode;
010:
011:        import com.hp.hpl.jena.reasoner.TriplePattern;
012:        import com.hp.hpl.jena.reasoner.rulesys.impl.StateFlag;
013:
014:        import java.util.Iterator;
015:
016:        /**
017:         * Wraps up the backward chaining engine as an iterator-like object that can be
018:         * used in InfGraphs to implement a "find" operation. It creates
019:         * a top level GoalState and pumps that for results until the 
020:         * agenda is empty.
021:         * 
022:         * @author <a href="mailto:der@hplb.hpl.hp.com">Dave Reynolds</a>
023:         * @version $Revision: 1.7 $ on $Date: 2008/01/02 12:09:45 $
024:         */
025:        public class TopGoalIterator implements  Iterator {
026:
027:            /** The GoalState which is traversing the top level derivation tree */
028:            GoalState goalState;
029:
030:            /** The next result to be returned, or null if we have finished */
031:            Object lookAhead;
032:
033:            /** The parent backward chaining engine */
034:            BRuleEngine engine;
035:
036:            /**
037:             * Constructor. Wraps a top level goal state as an iterator
038:             */
039:            public TopGoalIterator(BRuleEngine engine, TriplePattern goal) {
040:                this .engine = engine;
041:                this .goalState = engine.findGoal(goal);
042:                moveForward();
043:            }
044:
045:            /**
046:             * Find the next result in the goal state and put it in the
047:             * lookahead buffer.
048:             */
049:            private void moveForward() {
050:                lookAhead = goalState.next();
051:                if (lookAhead == StateFlag.SUSPEND) {
052:                    if (engine.next(goalState) != null) {
053:                        lookAhead = goalState.next();
054:                    } else {
055:                        lookAhead = null;
056:                    }
057:                } else if (lookAhead == StateFlag.FAIL) {
058:                    lookAhead = null;
059:                }
060:                if (lookAhead == null)
061:                    close();
062:            }
063:
064:            /**
065:             * @see com.hp.hpl.jena.util.iterator.ClosableIterator#close()
066:             */
067:            public void close() {
068:                goalState.close();
069:                engine.halt();
070:            }
071:
072:            /**
073:             * @see java.util.Iterator#hasNext()
074:             */
075:            public boolean hasNext() {
076:                return (lookAhead != null);
077:            }
078:
079:            /**
080:             * @see java.util.Iterator#next()
081:             */
082:            public Object next() {
083:                Object result = lookAhead;
084:                moveForward();
085:                return result;
086:            }
087:
088:            /**
089:             * @see java.util.Iterator#remove()
090:             */
091:            public void remove() {
092:                throw new UnsupportedOperationException();
093:            }
094:
095:        }
096:
097:        /*
098:         (c) Copyright 2003, 2004, 2005, 2006, 2007, 2008 Hewlett-Packard Development Company, LP
099:         All rights reserved.
100:
101:         Redistribution and use in source and binary forms, with or without
102:         modification, are permitted provided that the following conditions
103:         are met:
104:
105:         1. Redistributions of source code must retain the above copyright
106:         notice, this list of conditions and the following disclaimer.
107:
108:         2. Redistributions in binary form must reproduce the above copyright
109:         notice, this list of conditions and the following disclaimer in the
110:         documentation and/or other materials provided with the distribution.
111:
112:         3. The name of the author may not be used to endorse or promote products
113:         derived from this software without specific prior written permission.
114:
115:         THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
116:         IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
117:         OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
118:         IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
119:         INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
120:         NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
121:         DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
122:         THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
123:         (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
124:         THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
125:         */
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