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


001:        /******************************************************************
002:         * File:        Builtin.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: Builtin.java,v 1.13 2008/01/02 12:07:47 andy_seaborne Exp $
009:         *****************************************************************/package com.hp.hpl.jena.reasoner.rulesys;
010:
011:        import com.hp.hpl.jena.graph.*;
012:
013:        /**
014:         * Rules employ builtins to do all tests and actions other than simple triple
015:         * matches and triple creation. 
016:         * <p>
017:         * Builtins can be invoked in two contexts. In the head of forward rules they perform
018:         * some action based on the variable bindings generated by the body and additional context
019:         * (the graph being reasoned over, the set of triples bound by the body). In the body
020:         * of rules they perform tests, and additional variable bindings.
021:         * <p>
022:         * The mapping from the rule definition (which uses functors to hold the parsed call)
023:         * to the java implementation of the builtin is done via the 
024:         * {@link BuiltinRegistry BuiltinRegistry} which can
025:         * be user extended.
026:         * 
027:         * @author <a href="mailto:der@hplb.hpl.hp.com">Dave Reynolds</a>
028:         * @version $Revision: 1.13 $ on $Date: 2008/01/02 12:07:47 $
029:         */
030:        public interface Builtin {
031:
032:            /**
033:             * Return a convenient name for this builtin, normally this will be the name of the 
034:             * functor that will be used to invoke it and will often be the final component of the
035:             * URI.
036:             */
037:            public String getName();
038:
039:            /**
040:             * Return the full URI which identifies this built in.
041:             */
042:            public String getURI();
043:
044:            /**
045:             * Return the expected number of arguments for this functor or 0 if the number is flexible.
046:             */
047:            public int getArgLength();
048:
049:            /**
050:             * This method is invoked when the builtin is called in a rule body.
051:             * @param args the array of argument values for the builtin, this is an array 
052:             * of Nodes, some of which may be Node_RuleVariables.
053:             * @param length the length of the argument list, may be less than the length of the args array
054:             * for some rule engines
055:             * @param context an execution context giving access to other relevant data
056:             * @return return true if the buildin predicate is deemed to have succeeded in
057:             * the current environment
058:             */
059:            public boolean bodyCall(Node[] args, int length, RuleContext context);
060:
061:            /**
062:             * This method is invoked when the builtin is called in a rule head.
063:             * Such a use is only valid in a forward rule.
064:             * @param args the array of argument values for the builtin, this is an array 
065:             * of Nodes.
066:             * @param length the length of the argument list, may be less than the length of the args array
067:             * for some rule engines
068:             * @param context an execution context giving access to other relevant data
069:             */
070:            public void headAction(Node[] args, int length, RuleContext context);
071:
072:            /**
073:             * Returns false if this builtin has side effects when run in a body clause,
074:             * other than the binding of environment variables.
075:             */
076:            public boolean isSafe();
077:
078:            /**
079:             * Returns false if this builtin is non-monotonic. This includes non-monotonic checks like noValue
080:             * and non-monotonic actions like remove/drop. A non-monotonic call in a head is assumed to 
081:             * be an action and makes the overall rule and ruleset non-monotonic. 
082:             * Most JenaRules are monotonic deductive closure rules in which this should be false.
083:             */
084:            public boolean isMonotonic();
085:        }
086:
087:        /*
088:         (c) Copyright 2003, 2004, 2005, 2006, 2007, 2008 Hewlett-Packard Development Company, LP
089:         All rights reserved.
090:
091:         Redistribution and use in source and binary forms, with or without
092:         modification, are permitted provided that the following conditions
093:         are met:
094:
095:         1. Redistributions of source code must retain the above copyright
096:         notice, this list of conditions and the following disclaimer.
097:
098:         2. Redistributions in binary form must reproduce the above copyright
099:         notice, this list of conditions and the following disclaimer in the
100:         documentation and/or other materials provided with the distribution.
101:
102:         3. The name of the author may not be used to endorse or promote products
103:         derived from this software without specific prior written permission.
104:
105:         THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
106:         IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
107:         OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
108:         IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
109:         INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
110:         NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
111:         DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
112:         THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
113:         (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
114:         THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
115:         */
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