jenahandler.java

Jena推理机

/*
 * (c) Copyright 2004, 2005, 2006, 2007 Hewlett-Packard Development Company, LP [See end of file]
 */

package com.hp.hpl.jena.rdf.arp;

import java.util.Arrays;

import com.hp.hpl.jena.graph.*;
import com.hp.hpl.jena.rdf.arp.impl.ARPSaxErrorHandler;
import com.hp.hpl.jena.rdf.model.*;
import com.hp.hpl.jena.shared.JenaException;
import com.hp.hpl.jena.shared.PrefixMapping;
import com.hp.hpl.jena.shared.impl.PrefixMappingImpl;

final class JenaHandler extends ARPSaxErrorHandler implements StatementHandler,
        NamespaceHandler
    {
    static private final int BULK_UPDATE_SIZE = 1000;

    private final BulkUpdateHandler bulk;

    private final PrefixMapping prefixMapping;

    protected final Triple triples[];

    protected int here = 0;

    public JenaHandler( Model m, RDFErrorHandler e )
        { this( m.getGraph(), e ); }

    public JenaHandler( Graph g, Model m, RDFErrorHandler e )
        { this( g, modelToPrefixMapping( m ), e ); }
    
    private JenaHandler( Graph graph, RDFErrorHandler e )
        { this( graph, graph.getPrefixMapping(), e ); }

    private JenaHandler( Graph graph, PrefixMapping prefixMapping, RDFErrorHandler errorHandler )
        {
        super( errorHandler );
        this.bulk = graph.getBulkUpdateHandler();
        this.triples = new Triple[BULK_UPDATE_SIZE];
        this.prefixMapping = prefixMapping; 
        }
    
    private static PrefixMapping modelToPrefixMapping( Model model )
        {
        return model == null 
            ? PrefixMapping.Factory.create() 
            : model.getGraph().getPrefixMapping()
            ;
        }

    public void useWith( ARPHandlers h )
        {
        h.setStatementHandler( this );
        h.setErrorHandler( this );
        h.setNamespaceHandler( this );
        }

    public void statement( AResource subj, AResource pred, AResource obj )
        {
        try
            { triples[here++] = JenaReader.convert( subj, pred, obj ); }
        catch (JenaException e)
            { errorHandler.error( e ); }
        if (here == BULK_UPDATE_SIZE) bulkUpdate();
        }

    public void statement( AResource subj, AResource pred, ALiteral lit )
        {
        try
            { triples[here++] = JenaReader.convert( subj, pred, lit ); }
        catch (JenaException e)
            { errorHandler.error( e ); }
        if (here == BULK_UPDATE_SIZE) bulkUpdate();
        }

    public void bulkUpdate()
        {
        try
            {
            if (here == BULK_UPDATE_SIZE) bulk.add( triples );
            else bulk.add( Arrays.asList( triples ).subList( 0, here ) );
            }
        catch (JenaException e)
            { errorHandler.error( e ); }
        finally
            { here = 0; }
        }

    public void startPrefixMapping( String prefix, String uri )
        {
        if (PrefixMappingImpl.isNiceURI( uri )) prefixMapping.setNsPrefix( prefix, uri );
        }

    public void endPrefixMapping( String prefix )
        {}
    }

/*
 * (c) Copyright 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.
 */