literalaccessorimpl.java

Jena推理机

/*****************************************************************************
 * Source code information
 * -----------------------
 * Original author    Ian Dickinson, HP Labs Bristol
 * Author email       [e-mail]
 * Package            Jena
 * Created            26 Jan 2001
 * Filename           $RCSfile: LiteralAccessorImpl.java,v $
 * Revision           $Revision: 1.11 $
 * Release status     Preview-release $State: Exp $
 *
 * Last modified on   $Date: 2007/01/08 14:40:30 $
 *               by   $Author: ian_dickinson $
 *
 * (c) Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007 Hewlett-Packard Development Company, LP
 * (see footer for full conditions)
 *****************************************************************************/

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


// Imports
///////////////
import com.hp.hpl.jena.ontology.*;
import com.hp.hpl.jena.ontology.daml.*;
import com.hp.hpl.jena.rdf.model.*;



/**
 * <p>Encapsulates the standard methods of modifying a property on a DAML object, where
 * the value of the property is an RDF literal (as opposed to another DAML value,
 * see {@link PropertyAccessor}.<p>
 *
 * @author Ian Dickinson, HP Labs (<a href="mailto:[e-mail]">email</a>)
 * @version CVS info: $Id: LiteralAccessorImpl.java,v 1.11 2007/01/08 14:40:30 ian_dickinson Exp $
 * @deprecated The DAML API is scheduled to be removed from Jena 2.6 onwards. Please use the DAML profile in the main ontology API
 */
public class LiteralAccessorImpl
    extends PropertyAccessorImpl
    implements LiteralAccessor
{
    // Constants
    //////////////////////////////////


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


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


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

    /**
     * <p>Construct a new accessor for literal values of the given property.</p>
     *
     * @param property The property that this accessor works on
     * @param val The DAML value that has this property
     */
    public LiteralAccessorImpl( Property property, OntResource val ) {
        super( property, val );
    }



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

    /**
     * <p>Answer the value of the encapsulated property. If it has no values, answer
     * null. If it has one value, answer that value. Otherwise, answer an undetermined
     * member of the set of values.<p>
     *
     * @return The literal value of the encapsulated property, or null.
     */
    public Literal getValue() {
        NodeIterator i = null;
        try {
            i = getAll();
            return (i == null  ||  !i.hasNext()) ? null : ((Literal) i.nextNode());
        }
        finally {
            if (i != null) {
                i.close();
            }
        }
    }


    /**
     * <p>Add a value to the encapsulated property.</p>
     *
     * @param value The value to be added, as a string.
     */
    public void addValue( String value ) {
        add( m_val.getModel().createLiteral( value ) );
    }


    /**
     * <p>Remove a value from the encapsulated property.</p>
     *
     * @param value The value to be removed, as a string.
     */
    public void removeValue( String value ) {
        remove( m_val.getModel().createLiteral( value ) );
    }


    /**
     * <p>Answer true if the encapsulated property has the given value as one of its
     * values.</p>
     *
     * @param value A String value to test for
     * @return True if the RDF model contains a statement giving a value for
     *         the encapsulated property matching the given value.
     */
    public boolean hasValue( String value ) {
        return hasValue( m_val.getModel().createLiteral( value ) );
    }



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



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


}

/*
    (c) Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007 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.
*/