001/**
002 * Copyright 2015 DuraSpace, Inc.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package org.fcrepo.kernel.impl.rdf.impl;
017
018import static org.fcrepo.kernel.impl.identifiers.NodeResourceConverter.nodeToResource;
019
020import javax.jcr.Node;
021
022import org.fcrepo.kernel.identifiers.IdentifierConverter;
023import org.fcrepo.kernel.models.FedoraResource;
024import org.fcrepo.kernel.utils.iterators.RdfStream;
025
026import com.google.common.base.Converter;
027import com.hp.hpl.jena.rdf.model.Resource;
028
029/**
030 * {@link RdfStream} that holds contexts related to a specific {@link Node}.
031 *
032 * @author ajs6f
033 * @since Oct 10, 2013
034 */
035public class NodeRdfContext extends RdfStream {
036
037    private final FedoraResource resource;
038
039    private final IdentifierConverter<Resource, FedoraResource> idTranslator;
040
041    private final com.hp.hpl.jena.graph.Node subject;
042
043
044    /**
045     * Default constructor.
046     *
047     * @param resource the resource
048     * @param idTranslator the id translator
049     */
050    public NodeRdfContext(final FedoraResource resource,
051                          final IdentifierConverter<Resource, FedoraResource> idTranslator) {
052        super();
053        this.resource = resource;
054        this.idTranslator = idTranslator;
055        this.subject = idTranslator.reverse().convert(resource).asNode();
056    }
057
058    /**
059     * @return The {@link Node} in question
060     */
061    public FedoraResource resource() {
062        return resource;
063    }
064
065    /**
066     * @return local {@link org.fcrepo.kernel.identifiers.IdentifierConverter}
067     */
068    public IdentifierConverter<Resource, FedoraResource> translator() {
069        return idTranslator;
070    }
071
072    /**
073     * @return local {@link org.fcrepo.kernel.identifiers.IdentifierConverter}
074     */
075    public Converter<Node, Resource> nodeConverter() {
076        return nodeToResource(idTranslator);
077    }
078
079    /**
080     * @return the RDF subject at the center of this context
081     */
082    public com.hp.hpl.jena.graph.Node subject() {
083        return subject;
084    }
085}