propertyimpl.java

Jena推理机

/*
 *  (c) Copyright 2000, 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.
 *
 * PropertyImpl.java
 *
 * Created on 03 August 2000, 13:47
 */

package com.hp.hpl.jena.rdf.model.impl;

import com.hp.hpl.jena.rdf.model.*;
import com.hp.hpl.jena.vocabulary.RDF;
import com.hp.hpl.jena.graph.*;
import com.hp.hpl.jena.enhanced.*;
import com.hp.hpl.jena.shared.*;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/** An implementation of Property.
 *
 * @author  bwm
 * @version  Release='$Name:  $' Revision='$Revision: 1.16 $' Date='$Date: 2007/01/11 10:13:48 $'
 */

public class PropertyImpl extends ResourceImpl implements Property
    {

    final static public Implementation factory = new Implementation() 
        {
        public boolean canWrap( Node n, EnhGraph eg )
            { return n.isURI(); }

        public EnhNode wrap( Node n, EnhGraph eg )
            { return new PropertyImpl( n, eg ); }
    };

    protected static Log logger = LogFactory.getLog( PropertyImpl.class );

    protected int ordinal = -1;

    /** Creates new PropertyImpl */
    public PropertyImpl( String uri )
        {
        super( uri );
        checkLocalName();
        checkOrdinal();
        }

    public RDFNode inModel( Model m )
        { return getModel() == m ? this : m.createProperty( getURI() ); }

    private void checkLocalName()
        {
        String localName = getLocalName();
        if (localName == null || localName.equals( "" )) 
            throw new InvalidPropertyURIException( getURI() );
        }

    public PropertyImpl( String nameSpace, String localName )
        {
        super( nameSpace, localName );
        checkLocalName();
        checkOrdinal();
        }

    public PropertyImpl( String uri, ModelCom m )
        {
        super( uri, m );
        checkOrdinal();
        }

    public PropertyImpl( String nameSpace, String localName, ModelCom m )
        {
        super( nameSpace, localName, m );
        checkOrdinal();
        }

    public PropertyImpl( Node n, EnhGraph m )
        {
        super( n, m );
        checkOrdinal();
        }

    public PropertyImpl( String nameSpace, String localName, int ordinal, ModelCom m )
        {
        super( nameSpace, localName, m );
        checkLocalName();
        this.ordinal = ordinal;
        }

    public boolean isProperty()
        { return true; }

    public int getOrdinal()
        {
        if (ordinal < 0) ordinal = computeOrdinal();
        return ordinal;
        }

    private int computeOrdinal()
        {
        String localName = getLocalName();
        if (getNameSpace().equals( RDF.getURI() ) && localName.matches( "_[0-9]+" )) 
            return parseInt( localName.substring( 1 ) );
        return 0;
        }

    private int parseInt( String digits )
        {
        try { return Integer.parseInt( digits );}
        catch (NumberFormatException e) { throw new JenaException( "checkOrdinal fails on " + digits, e ); }
        }

    // Remove shortly.

    protected void checkOrdinal()
        {
        // char c;
        // String nameSpace = getNameSpace();
        // String localName = getLocalName();
        // // check for an rdf:_xxx property
        // if (localName.length() > 0)
        // {
        // if (localName.charAt(0) == '_' && nameSpace.equals(RDF.getURI())
        // && nameSpace.equals(RDF.getURI())
        // && localName.length() > 1
        // )
        // {
        // for (int i=1; i<localName.length(); i++) {
        // c = localName.charAt(i);
        // if (c < '0' || c > '9') return;
        // }
        //                try {
        //                  ordinal = Integer.parseInt(localName.substring(1));
        //                } catch (NumberFormatException e) {
        //                    logger.error( "checkOrdinal fails on " + localName, e );
        //                }
        //            }
        //        }
        }

    }