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


001:        /******************************************************************
002:         * File:        Remove.java
003:         * Created by:  Dave Reynolds
004:         * Created on:  11-Apr-2003
005:         * 
006:         * (c) Copyright 2003, 2004, 2005, 2006, 2007, 2008 Hewlett-Packard Development Company, LP
007:         * [See end of file]
008:         * $Id: Remove.java,v 1.14 2008/01/02 12:06:21 andy_seaborne Exp $
009:         *****************************************************************/package com.hp.hpl.jena.reasoner.rulesys.builtins;
010:
011:        import com.hp.hpl.jena.reasoner.TriplePattern;
012:        import com.hp.hpl.jena.reasoner.rulesys.*;
013:        import com.hp.hpl.jena.graph.*;
014:
015:        /**
016:         * Remove the body clause given by index arguments from the database.
017:         * 
018:         * @author <a href="mailto:der@hplb.hpl.hp.com">Dave Reynolds</a>
019:         * @version $Revision: 1.14 $ on $Date: 2008/01/02 12:06:21 $
020:         */
021:        public class Remove extends BaseBuiltin {
022:
023:            /**
024:             * Return a name for this builtin, normally this will be the name of the 
025:             * functor that will be used to invoke it.
026:             */
027:            public String getName() {
028:                return "remove";
029:            }
030:
031:            /**
032:             * This method is invoked when the builtin is called in a rule head.
033:             * Such a use is only valid in a forward rule.
034:             * @param args the array of argument values for the builtin, this is an array 
035:             * of Nodes.
036:             * @param length the length of the argument list, may be less than the length of the args array
037:             * for some rule engines
038:             * @param context an execution context giving access to other relevant data
039:             */
040:            public void headAction(Node[] args, int length, RuleContext context) {
041:                boolean ok = false;
042:                for (int i = 0; i < length; i++) {
043:                    Node clauseN = getArg(i, args, context);
044:                    if (Util.isNumeric(clauseN)) {
045:                        int clauseIndex = Util.getIntValue(clauseN);
046:                        Object clause = context.getRule().getBodyElement(
047:                                clauseIndex);
048:                        if (clause instanceof  TriplePattern) {
049:                            Triple t = context.getEnv().instantiate(
050:                                    (TriplePattern) clause);
051:                            context.remove(t);
052:                        } else {
053:                            throw new BuiltinException(this , context,
054:                                    "illegal triple to remove non-triple clause");
055:                        }
056:                    } else {
057:                        throw new BuiltinException(this , context,
058:                                "illegal arg to remove (" + clauseN
059:                                        + "), must be an integer");
060:                    }
061:                }
062:            }
063:
064:            /**
065:             * Returns false if this builtin is non-monotonic. This includes non-monotonic checks like noValue
066:             * and non-monotonic actions like remove/drop. A non-monotonic call in a head is assumed to 
067:             * be an action and makes the overall rule and ruleset non-monotonic. 
068:             * Most JenaRules are monotonic deductive closure rules in which this should be false.
069:             */
070:            public boolean isMonotonic() {
071:                return false;
072:            }
073:        }
074:
075:        /*
076:         (c) Copyright 2003, 2004, 2005, 2006, 2007, 2008 Hewlett-Packard Development Company, LP
077:         All rights reserved.
078:
079:         Redistribution and use in source and binary forms, with or without
080:         modification, are permitted provided that the following conditions
081:         are met:
082:
083:         1. Redistributions of source code must retain the above copyright
084:         notice, this list of conditions and the following disclaimer.
085:
086:         2. Redistributions in binary form must reproduce the above copyright
087:         notice, this list of conditions and the following disclaimer in the
088:         documentation and/or other materials provided with the distribution.
089:
090:         3. The name of the author may not be used to endorse or promote products
091:         derived from this software without specific prior written permission.
092:
093:         THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
094:         IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
095:         OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
096:         IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
097:         INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
098:         NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
099:         DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
100:         THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
101:         (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
102:         THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
103:         */
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