net.fortytwo.sesametools.SingleContextHandler Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of common Show documentation

Common utilities for Sesametools

The newest version!


package net.fortytwo.sesametools;

import org.openrdf.rio.RDFHandler;
import org.openrdf.rio.RDFHandlerException;
import org.openrdf.model.ValueFactory;
import org.openrdf.model.Statement;
import org.openrdf.model.IRI;
import org.openrdf.model.Resource;
import org.openrdf.model.Value;

/**
 * An RDFHandler which forces each received statement into a designated Named Graph context.
 *
 * @author Joshua Shinavier (http://fortytwo.net)
 */
public class SingleContextHandler implements RDFHandler {
    private RDFHandler baseHandler;
    private ValueFactory valueFactory;
    private Resource context;

    public SingleContextHandler(final RDFHandler base, final ValueFactory vf, final Resource singleContext) {
        this.baseHandler = base;
        this.valueFactory = vf;
        this.context = singleContext;
    }

    public void startRDF() throws RDFHandlerException {
        baseHandler.startRDF();
    }

    public void endRDF() throws RDFHandlerException {
        baseHandler.endRDF();
    }

    public void handleNamespace(final String prefix, final String uri) throws RDFHandlerException {
        baseHandler.handleNamespace(prefix, uri);
    }

    public void handleStatement(final Statement st) throws RDFHandlerException {
        Resource subj = st.getSubject();
        IRI pred = st.getPredicate();
        Value obj = st.getObject();

        Statement newSt = valueFactory.createStatement(subj, pred, obj, context);

        baseHandler.handleStatement(newSt);
    }

    public void handleComment(final String comment) throws RDFHandlerException {
        baseHandler.handleComment(comment);
    }
}