owlexptrulereasonerfactory.java

jena2.5.4推理机系统的一种最基本实现 HP实验室出品

/******************************************************************
 * File:        OWLExptRuleReasonerFactory.java
 * Created by:  Dave Reynolds
 * Created on:  10-Jul-2003
 * 
 * (c) Copyright 2003, 2004, 2005, 2006, 2007 Hewlett-Packard Development Company, LP
 * [See end of file]
 * $Id: OWLExptRuleReasonerFactory.java,v 1.9 2007/01/02 11:52:33 andy_seaborne Exp $
 *****************************************************************/
package com.hp.hpl.jena.reasoner.rulesys.impl.oldCode;

import com.hp.hpl.jena.reasoner.*;
import com.hp.hpl.jena.reasoner.rulesys.Util;
import com.hp.hpl.jena.rdf.model.*;
import com.hp.hpl.jena.vocabulary.*;

/**
 * Experimental change to the OWL hybrid rule reasoner.
 * <p>
 * Factory class for creating blank instances of the OWL Reasoner.
 * <p>
 * The reasoner can be configured using three properties (set as
 * properties of the base reasonder URI in a configuration model). These are:
 * <ul>
 * <li><b>derivationLogging</b> - if set to true this causes all derivations to
 * be recorded in an internal data structure for replay through the {@link com.hp.hpl.jena.reasoner.InfGraph#getDerivation getDerivation}
 * method. </li>
 * <li><b>traceOn</b> - if set to true this causes all rule firings and deduced triples to be
 * written out to the Log at INFO level.</li>
 * <li><b>ruleThreshold</b> - which limits the number of rules that can be fired on a single 
 * data processing stage to the given number (useful to limit infinite runaways). </li>
 * </ul>
 * 
 * @author <a href="mailto:[e-mail]">Dave Reynolds</a>
 * @version $Revision: 1.9 $ on $Date: 2007/01/02 11:52:33 $
 */
public class OWLExptRuleReasonerFactory implements ReasonerFactory {
    
    /** Single global instance of this factory */
    private static ReasonerFactory theInstance = new OWLExptRuleReasonerFactory();
    
    /** Static URI for this reasoner type */
    public static final String URI = "http://jena.hpl.hp.com/2003/OWLExptRuleReasoner";
    
    /** Cache of the capabilities description */
    protected Model capabilities;
    
    /**
     * Return the single global instance of this factory
     */
    public static ReasonerFactory theInstance() {
        return theInstance;
    }
    
    /**
     * Constructor method that builds an instance of the associated Reasoner
     * @param configuration a set of arbitrary configuration information to be 
     * passed the reasoner encoded within an RDF graph
     */
    public Reasoner create(Resource configuration) {
        OWLExptRuleReasoner reasoner = new OWLExptRuleReasoner(this);
        if (configuration != null) {
            Boolean doLog = Util.checkBinaryPredicate(ReasonerVocabulary.PROPderivationLogging, configuration);
            if (doLog != null) {
                reasoner.setDerivationLogging(doLog.booleanValue());
            }
            Boolean doTrace = Util.checkBinaryPredicate(ReasonerVocabulary.PROPtraceOn, configuration);
            if (doTrace != null) {
                reasoner.setTraceOn(doTrace.booleanValue());
            }
        }
        return reasoner;
    }
   
    /**
     * Return a description of the capabilities of this reasoner encoded in
     * RDF. This method is normally called by the ReasonerRegistry which caches
     * the resulting information so dynamically creating here is not really an overhead.
     */
    public Model getCapabilities() {
        if (capabilities == null) {
            capabilities = ModelFactory.createDefaultModel();
            Resource base = capabilities.createResource(getURI());
            base.addProperty(ReasonerVocabulary.nameP, "OWL BRule Reasoner")
                .addProperty(ReasonerVocabulary.descriptionP, "Experimental OWL reasoner.\n"
                                            + "Can separate tbox and abox data if desired to reuse tbox caching or mix them.")
                .addProperty(ReasonerVocabulary.supportsP, RDFS.subClassOf)
                .addProperty(ReasonerVocabulary.supportsP, RDFS.subPropertyOf)
                .addProperty(ReasonerVocabulary.supportsP, RDFS.member)
                .addProperty(ReasonerVocabulary.supportsP, RDFS.range)
                .addProperty(ReasonerVocabulary.supportsP, RDFS.domain)
                // TODO - add OWL elements supported
                .addProperty(ReasonerVocabulary.supportsP, ReasonerVocabulary.individualAsThingP )
                .addProperty(ReasonerVocabulary.versionP, "0.1");
        }
        return capabilities;
    }
    
    /**
     * Return the URI labelling this type of reasoner
     */
    public String getURI() {
        return URI;
    }
    
}


/*
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