edu.si.trippi.impl.sparql.converters.ObjectConverter Maven / Gradle / Ivy

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/*
 * 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.LiteralConverter.literalConverter;

import org.apache.jena.graph.Node;
import org.apache.jena.graph.Node_Blank;
import org.apache.jena.graph.Node_Literal;
import org.apache.jena.graph.Node_URI;
import org.jrdf.graph.BlankNode;
import org.jrdf.graph.Literal;
import org.jrdf.graph.ObjectNode;
import org.jrdf.graph.URIReference;

/**
 * For use with RDF object nodes.
 *
 * @see NodeConverter
 * @author A. Soroka
 */
public class ObjectConverter extends NodeConverter {

    public static final ObjectConverter objectConverter = new ObjectConverter();

    private ObjectConverter() {}

    @Override
    protected Node doForward(final ObjectNode object) {
        if (object.isURIReference()) return UriConverter.uriConverter.convert((URIReference) object);
        if (object.isBlankNode()) return BlankNodeConverter.blankNodeConverter.convert((BlankNode) object);
        return literalConverter.convert((Literal) object);
    }

    @Override
    protected ObjectNode doBackward(final Node object) {
        if (object.isURI()) return UriConverter.uriConverter.reverse().convert((Node_URI) object);
        if (object.isBlank()) return BlankNodeConverter.blankNodeConverter.reverse().convert((Node_Blank) object);
        return literalConverter.reverse().convert((Node_Literal) object);
    }
}