Source Code Cross Referenced for BasicForwardRuleReasoner.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:        BasicForwardRuleReasoner.java
003:         * Created by:  Dave Reynolds
004:         * Created on:  30-Mar-03
005:         * 
006:         * (c) Copyright 2003, 2004, 2005, 2006, 2007, 2008 Hewlett-Packard Development Company, LP
007:         * [See end of file]
008:         * $Id: BasicForwardRuleReasoner.java,v 1.19 2008/01/02 12:07:47 andy_seaborne Exp $
009:         *****************************************************************/package com.hp.hpl.jena.reasoner.rulesys;
010:
011:        import com.hp.hpl.jena.rdf.model.*;
012:        import com.hp.hpl.jena.reasoner.*;
013:        import com.hp.hpl.jena.vocabulary.ReasonerVocabulary;
014:        import com.hp.hpl.jena.graph.*;
015:
016:        import java.util.*;
017:
018:        /** * Reasoner implementation which augments or transforms an RDF graph
019:         * according to a set of rules. This trivial version does not support
020:         * separate schema processing. The actual work is done in the inference
021:         * graph implementation.
022:         *  * @author <a href="mailto:der@hplb.hpl.hp.com">Dave Reynolds</a> * @version $Revision: 1.19 $ on $Date: 2008/01/02 12:07:47 $ */
023:        public class BasicForwardRuleReasoner implements  Reasoner {
024:
025:            /** The parent reasoner factory which is consulted to answer capability questions */
026:            protected ReasonerFactory factory;
027:
028:            /** The rules to be used by this instance of the forward engine */
029:            protected List rules;
030:
031:            /** A precomputed set of schema deductions */
032:            protected InfGraph schemaGraph;
033:
034:            /** Flag to set whether the inference class should record derivations */
035:            protected boolean recordDerivations = false;
036:
037:            /** Flag which, if true, enables tracing of rule actions to logger.info */
038:            protected boolean traceOn = false;
039:
040:            /** The graph capabilities of the infgraphs generated by this reasoner */
041:            protected Capabilities capabilities;
042:
043:            /**
044:             * Constructor. This is the raw version that does not reference a ReasonerFactory
045:             * and so has no capabilities description. 
046:             * @param rules a list of Rule instances which defines the ruleset to process
047:             */
048:            public BasicForwardRuleReasoner(List rules) {
049:                this .rules = rules;
050:            }
051:
052:            /**
053:             * Constructor
054:             * @param rules a list of Rule instances which defines the ruleset to process
055:             * @param factory the parent reasoner factory which is consulted to answer capability questions
056:             */
057:            public BasicForwardRuleReasoner(List rules, ReasonerFactory factory) {
058:                this .rules = rules;
059:                this .factory = factory;
060:            }
061:
062:            /**
063:             * Internal constructor, used to generated a partial binding of a schema
064:             * to a rule reasoner instance.
065:             */
066:            private BasicForwardRuleReasoner(List rules, InfGraph schemaGraph,
067:                    ReasonerFactory factory) {
068:                this .rules = rules;
069:                this .schemaGraph = schemaGraph;
070:                this .factory = factory;
071:            }
072:
073:            /**
074:             * Return a description of the capabilities of this reasoner encoded in
075:             * RDF. These capabilities may be static or may depend on configuration
076:             * information supplied at construction time. May be null if there are
077:             * no useful capabilities registered.
078:             */
079:            public Model getReasonerCapabilities() {
080:                if (factory != null) {
081:                    return factory.getCapabilities();
082:                } else {
083:                    return null;
084:                }
085:            }
086:
087:            /**
088:             * Add a configuration description for this reasoner into a partial
089:             * configuration specification model.
090:             * @param configSpec a Model into which the configuration information should be placed
091:             * @param base the Resource to which the configuration parameters should be added.
092:             */
093:            public void addDescription(Model configSpec, Resource base) {
094:                // No configuration
095:            }
096:
097:            /**
098:             * Determine whether the given property is recognized and treated specially
099:             * by this reasoner. This is a convenience packaging of a special case of getCapabilities.
100:             * @param property the property which we want to ask the reasoner about, given as a Node since
101:             * this is part of the SPI rather than API
102:             * @return true if the given property is handled specially by the reasoner.
103:             */
104:            public boolean supportsProperty(Property property) {
105:                if (factory == null)
106:                    return false;
107:                Model caps = factory.getCapabilities();
108:                Resource root = caps.getResource(factory.getURI());
109:                return caps.contains(root, ReasonerVocabulary.supportsP,
110:                        property);
111:            }
112:
113:            /**
114:             * Precompute the implications of a schema graph. The statements in the graph
115:             * will be combined with the data when the final InfGraph is created.
116:             */
117:            public Reasoner bindSchema(Graph tbox) throws ReasonerException {
118:                InfGraph graph = new BasicForwardRuleInfGraph(this , rules,
119:                        null, tbox);
120:                return new BasicForwardRuleReasoner(rules, graph, factory);
121:            }
122:
123:            /**
124:             * Precompute the implications of a schema Model. The statements in the graph
125:             * will be combined with the data when the final InfGraph is created.
126:             */
127:            public Reasoner bindSchema(Model tbox) throws ReasonerException {
128:                InfGraph graph = new BasicForwardRuleInfGraph(this , rules,
129:                        null, tbox.getGraph());
130:                return new BasicForwardRuleReasoner(rules, graph, factory);
131:            }
132:
133:            /**
134:             * Attach the reasoner to a set of RDF data to process.
135:             * The reasoner may already have been bound to specific rules or ontology
136:             * axioms (encoded in RDF) through earlier bindRuleset calls.
137:             * 
138:             * @param data the RDF data to be processed, some reasoners may restrict
139:             * the range of RDF which is legal here (e.g. syntactic restrictions in OWL).
140:             * @return an inference graph through which the data+reasoner can be queried.
141:             * @throws ReasonerException if the data is ill-formed according to the
142:             * constraints imposed by this reasoner.
143:             */
144:            public InfGraph bind(Graph data) throws ReasonerException {
145:                BasicForwardRuleInfGraph graph = new BasicForwardRuleInfGraph(
146:                        this , rules, schemaGraph);
147:                graph.setDerivationLogging(recordDerivations);
148:                graph.setTraceOn(traceOn);
149:                graph.rebind(data);
150:                return graph;
151:            }
152:
153:            /**
154:             * Return the this of Rules used by this reasoner
155:             * @return a List of Rule objects
156:             */
157:            public List getRules() {
158:                return rules;
159:            }
160:
161:            /**
162:             * Switch on/off drivation logging.
163:             * If set to true then the InfGraph created from the bind operation will start
164:             * life with recording of derivations switched on. This is currently only of relevance
165:             * to rule-based reasoners.
166:             * <p>
167:             * Default - false.
168:             */
169:            public void setDerivationLogging(boolean logOn) {
170:                recordDerivations = logOn;
171:            }
172:
173:            /**
174:             * Set the state of the trace flag. If set to true then rule firings
175:             * are logged out to the Log at "INFO" level.
176:             */
177:            public void setTraceOn(boolean state) {
178:                traceOn = state;
179:            }
180:
181:            /**
182:             * Set a configuration paramter for the reasoner. The supported parameters
183:             * are:
184:             * <ul>
185:             * <li>BasicForwaredRuleReasoner.PROPderivationLogging - set to true to enable recording all rule derivations</li>
186:             * <li>BasicForwaredRuleReasoner.PROPtraceOn - set to true to enable verbose trace information to be sent to the logger INFO channel</li>
187:             * </ul> 
188:             * 
189:             * @param parameter the property identifying the parameter to be changed
190:             * @param value the new value for the parameter, typically this is a wrapped
191:             * java object like Boolean or Integer.
192:             */
193:            public void setParameter(Property parameter, Object value) {
194:                if (parameter.equals(ReasonerVocabulary.PROPderivationLogging)) {
195:                    recordDerivations = Util.convertBooleanPredicateArg(
196:                            parameter, value);
197:                } else if (parameter.equals(ReasonerVocabulary.PROPtraceOn)) {
198:                    traceOn = Util.convertBooleanPredicateArg(parameter, value);
199:                } else {
200:                    throw new IllegalParameterException(
201:                            "Don't recognize configuration parameter "
202:                                    + parameter + " for rule-based reasoner");
203:                }
204:            }
205:
206:            /**
207:             * Return the Jena Graph Capabilties that the inference graphs generated
208:             * by this reasoner are expected to conform to.
209:             */
210:            public Capabilities getGraphCapabilities() {
211:                if (capabilities == null) {
212:                    capabilities = new BaseInfGraph.InfCapabilities();
213:                }
214:                return capabilities;
215:            }
216:
217:        }
218:
219:        /*
220:         (c) Copyright 2003, 2004, 2005, 2006, 2007, 2008 Hewlett-Packard Development Company, LP
221:         All rights reserved.
222:
223:         Redistribution and use in source and binary forms, with or without
224:         modification, are permitted provided that the following conditions
225:         are met:
226:
227:         1. Redistributions of source code must retain the above copyright
228:         notice, this list of conditions and the following disclaimer.
229:
230:         2. Redistributions in binary form must reproduce the above copyright
231:         notice, this list of conditions and the following disclaimer in the
232:         documentation and/or other materials provided with the distribution.
233:
234:         3. The name of the author may not be used to endorse or promote products
235:         derived from this software without specific prior written permission.
236:
237:         THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
238:         IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
239:         OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
240:         IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
241:         INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
242:         NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
243:         DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
244:         THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
245:         (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
246:         THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
247:         */
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