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

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Common utilities for Sesametools

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package net.fortytwo.sesametools;

import org.openrdf.model.Statement;
import org.openrdf.rio.RDFHandler;
import org.openrdf.rio.RDFHandlerException;

/**
 * An RDFHandler which wraps another handler and ignores calls
 * to startRDF and endRDF,
 * allowing the base handler to be used multiple times.
 * For example, there may be several distinct operations which push RDF statements
 * into a wrapped RDFWriter before the document is terminated.
 * To actually call the base handler's startRDF and endRDF methods,
 * use reallyStartRDF and reallyEndRDF, respectively.
 *
 * @author Joshua Shinavier (http://fortytwo.net)
 */
public class ReusableRDFHandler implements RDFHandler {
    private RDFHandler baseHandler;

    public ReusableRDFHandler(final RDFHandler base) {
        this.baseHandler = base;
    }

    public void startRDF() throws RDFHandlerException {
    }

    public void endRDF() throws RDFHandlerException {
    }

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

    public void reallyEndRDF() 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 {
        baseHandler.handleStatement(st);
    }

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