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Jena is a Java framework for building Semantic Web applications. It provides a programmatic environment for RDF, RDFS and OWL, SPARQL and includes a rule-based inference engine.
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/*****************************************************************************
 * Source code information
 * -----------------------
 * Original author    Ian Dickinson, HP Labs Bristol
 * Author email       [email protected]
 * Package            Jena 2
 * Web                http://sourceforge.net/projects/jena/
 * Created            28-Apr-2003
 * Filename           $RCSfile: UnionClassImpl.java,v $
 * Revision           $Revision: 1.12 $
 * Release status     $State: Exp $
 *
 * Last modified on   $Date: 2008/01/02 12:08:02 $
 *               by   $Author: andy_seaborne $
 *
 * (c) Copyright 2002, 2003, 2004, 2005, 2006, 2007, 2008 Hewlett-Packard Development Company, LP
 * (see footer for full conditions)
 *****************************************************************************/

// Package
///////////////
package com.hp.hpl.jena.ontology.impl;


// Imports
///////////////
import com.hp.hpl.jena.enhanced.*;
import com.hp.hpl.jena.graph.Node;
import com.hp.hpl.jena.ontology.*;
import com.hp.hpl.jena.rdf.model.Property;


/**
 * 
 * Implementation of a node representing a union class description.
 * 
 *
 * @author Ian Dickinson, HP Labs
 *         (email)
 * @version CVS $Id: UnionClassImpl.java,v 1.12 2008/01/02 12:08:02 andy_seaborne Exp $
 */
public class UnionClassImpl 
    extends BooleanClassDescriptionImpl
    implements UnionClass
{
    // Constants
    //////////////////////////////////

    // Static variables
    //////////////////////////////////

    /**
     * A factory for generating UnionClass facets from nodes in enhanced graphs.
     * Note: should not be invoked directly by user code: use 
     * {@link com.hp.hpl.jena.rdf.model.RDFNode#as as()} instead.
     */
    public static Implementation factory = new Implementation() {
        public EnhNode wrap( Node n, EnhGraph eg ) { 
            if (canWrap( n, eg )) {
                return new UnionClassImpl( n, eg );
            }
            else {
                throw new ConversionException( "Cannot convert node " + n + " to UnionClass");
            } 
        }
            
        public boolean canWrap( Node node, EnhGraph eg ) {
            // node will support being an UnionClass facet if it has rdf:type owl:Class and an owl:unionOf statement (or equivalents) 
            Profile profile = (eg instanceof OntModel) ? ((OntModel) eg).getProfile() : null;
            Property union = (profile == null) ? null : profile.UNION_OF();
            
            return (profile != null)  &&  
                   profile.isSupported( node, eg, OntClass.class )  &&
                   union != null && 
                   eg.asGraph().contains( node, union.asNode(), Node.ANY );
        }
    };


    // Instance variables
    //////////////////////////////////

    // Constructors
    //////////////////////////////////

    /**
     * 
     * Construct a union class node represented by the given node in the given graph.
     * 
     * 
     * @param n The node that represents the resource
     * @param g The enh graph that contains n
     */
    public UnionClassImpl( Node n, EnhGraph g ) {
        super( n, g );
    }


    // External signature methods
    //////////////////////////////////

	public Property operator() {return getProfile().UNION_OF();}
	public String getOperatorName() {return "UNION_OF";}


    // Internal implementation methods
    //////////////////////////////////

    //==============================================================================
    // Inner class definitions
    //==============================================================================

}


/*
    (c) Copyright 2002, 2003, 2004, 2005, 2006, 2007, 2008 Hewlett-Packard Development Company, LP
    All rights reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:

    1. Redistributions of source code must retain the above copyright
       notice, this list of conditions and the following disclaimer.

    2. Redistributions in binary form must reproduce the above copyright
       notice, this list of conditions and the following disclaimer in the
       documentation and/or other materials provided with the distribution.

    3. The name of the author may not be used to endorse or promote products
       derived from this software without specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
    OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
    IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
    NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
    THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/