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Trippi RDF SPI implementation using SPARQL over HTTP
There is a newer version: 1.2
/*
 * Copyright 2015-2016 Smithsonian Institution.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License.You may obtain a copy of
 * the License at: http://www.apache.org/licenses/
 *
 * This software and accompanying documentation is supplied without
 * warranty of any kind. The copyright holder and the Smithsonian Institution:
 * (1) expressly disclaim any warranties, express or implied, including but not
 * limited to any implied warranties of merchantability, fitness for a
 * particular purpose, title or non-infringement; (2) do not assume any legal
 * liability or responsibility for the accuracy, completeness, or usefulness of
 * the software; (3) do not represent that use of the software would not
 * infringe privately owned rights; (4) do not warrant that the software
 * is error-free or will be maintained, supported, updated or enhanced;
 * (5) will not be liable for any indirect, incidental, consequential special
 * or punitive damages of any kind or nature, including but not limited to lost
 * profits or loss of data, on any basis arising from contract, tort or
 * otherwise, even if any of the parties has been warned of the possibility of
 * such loss or damage.
 *
 * This distribution includes several third-party libraries, each with their own
 * license terms. For a complete copy of all copyright and license terms, including
 * those of third-party libraries, please see the product release notes.
 *
 */

package edu.si.trippi.impl.sparql.converters;

import static edu.si.trippi.impl.sparql.converters.ObjectConverter.objectConverter;
import static edu.si.trippi.impl.sparql.converters.SubjectConverter.subjectConverter;
import static org.apache.jena.graph.Triple.create;

import org.apache.jena.ext.com.google.common.base.Converter;
import org.jrdf.graph.Triple;
import org.trippi.impl.FreeTriple;

/**
 * Converts an RDF triple in the JRDF system to the same triple in the Jena
 * system, and vice versa. Subtypes of this class are required to be fully
 * invertible. Blank node conversion must occur via some invertible
 * transformation of label, which means that subtypes of this class may NOT take
 * responsibility for the scope of blank nodes.
 *
 * @author A. Soroka
 */
public class TripleConverter extends Converter {

    public static final TripleConverter tripleConverter = new TripleConverter();

    @Override
    protected org.apache.jena.graph.Triple doForward(final Triple t) {
        return create(subjectConverter.convert(t.getSubject()), PredicateConverter.predicateConverter.convert(t.getPredicate()),
                objectConverter.convert(t.getObject()));
    }

    @Override
    protected Triple doBackward(final org.apache.jena.graph.Triple t) {
        return new FreeTriple(subjectConverter.reverse().convert(t.getSubject()), PredicateConverter.predicateConverter.reverse().convert(t
                .getPredicate()), objectConverter.reverse().convert(t.getObject()));
    }
}