genericrulereasonerfactory.java

jena2.5.4推理机系统的一种最基本实现 HP实验室出品

/******************************************************************
 * File:        GenericRuleReasonerFactory.java
 * Created by:  Dave Reynolds
 * Created on:  08-Jun-2003
 * 
 * (c) Copyright 2003, 2004, 2005, 2006, 2007 Hewlett-Packard Development Company, LP
 * [See end of file]
 * $Id: GenericRuleReasonerFactory.java,v 1.12 2007/01/02 11:50:58 andy_seaborne Exp $
 *****************************************************************/
package com.hp.hpl.jena.reasoner.rulesys;

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

/**
 * Factory object for creating general rule reasoner instances. The
 * specific rule set and mode confriguration can be set either be method
 * calls to the created reasoner or though parameters in the configuration Model.
 * 
 * @author <a href="mailto:[e-mail]">Dave Reynolds</a>
 * @version $Revision: 1.12 $ on $Date: 2007/01/02 11:50:58 $
 */
public class GenericRuleReasonerFactory implements ReasonerFactory {
    
    /** Single global instance of this factory */
    private static GenericRuleReasonerFactory theInstance = new GenericRuleReasonerFactory();
    
    /** Static URI for this reasoner type */
    public static final String URI = "http://jena.hpl.hp.com/2003/GenericRuleReasoner";
    
    /** Cache of the capabilities description */
    protected Model capabilities;
    
    /**
     * Return the single global instance of this factory
     */
    public static GenericRuleReasonerFactory 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 as RDF properties of a base configuration resource,
     * can be null in no custom configuration is required.
     */
    public Reasoner create( Resource configuration ) {
        return new GenericRuleReasoner( this, configuration ); 
    }
   
    /**
     * 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, "Generic Rule Reasoner")
                .addProperty(ReasonerVocabulary.descriptionP, "Generic rule reasoner, configurable")
                .addProperty(ReasonerVocabulary.versionP, "0.1");
        }
        return capabilities;
    }
    
    /**
     * Return the URI labelling this type of reasoner
     */
    public String getURI() {
        return URI;
    }

}



/*
    (c) Copyright 2003, 2004, 2005, 2006, 2007 Hewlett-Packard Development Company, LP
    All rights reserved.

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