001/*
002 * Licensed to DuraSpace under one or more contributor license agreements.
003 * See the NOTICE file distributed with this work for additional information
004 * regarding copyright ownership.
005 *
006 * DuraSpace licenses this file to you under the Apache License,
007 * Version 2.0 (the "License"); you may not use this file except in
008 * compliance with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.fcrepo.kernel.modeshape.rdf.impl;
019
020import static org.fcrepo.kernel.modeshape.identifiers.NodeResourceConverter.nodeToResource;
021
022import javax.jcr.Node;
023
024import org.fcrepo.kernel.api.identifiers.IdentifierConverter;
025import org.fcrepo.kernel.api.models.FedoraResource;
026import org.fcrepo.kernel.api.rdf.DefaultRdfStream;
027
028import com.google.common.base.Converter;
029import com.hp.hpl.jena.rdf.model.Resource;
030
031/**
032 * {@link org.fcrepo.kernel.api.RdfStream} that holds contexts related to a specific {@link Node}.
033 *
034 * @author ajs6f
035 * @since Oct 10, 2013
036 */
037public class NodeRdfContext extends DefaultRdfStream {
038
039    private final FedoraResource resource;
040
041    private final IdentifierConverter<Resource, FedoraResource> idTranslator;
042
043    private final com.hp.hpl.jena.graph.Node subject;
044
045    /**
046     * Default constructor.
047     *
048     * @param resource the resource
049     * @param idTranslator the id translator
050     */
051    public NodeRdfContext(final FedoraResource resource,
052                          final IdentifierConverter<Resource, FedoraResource> idTranslator) {
053        super(idTranslator.reverse().convert(resource).asNode());
054        this.resource = resource;
055        this.idTranslator = idTranslator;
056        this.subject = uriFor(resource);
057    }
058
059    /**
060     * @return The {@link Node} in question
061     */
062    public FedoraResource resource() {
063        return resource;
064    }
065
066    /**
067     * @return local {@link org.fcrepo.kernel.api.identifiers.IdentifierConverter}
068     */
069    public IdentifierConverter<Resource, FedoraResource> translator() {
070        return idTranslator;
071    }
072
073    /**
074     * @param resource a Fedora model instance that must be identified by an URI
075     * @return a translated URI for that resource
076     */
077    protected com.hp.hpl.jena.graph.Node uriFor(final FedoraResource resource) {
078        return translator().reverse().convert(resource).asNode();
079    }
080
081    /**
082     * @return local {@link org.fcrepo.kernel.api.identifiers.IdentifierConverter}
083     */
084    public Converter<Node, Resource> nodeConverter() {
085        return nodeToResource(idTranslator);
086    }
087
088    /**
089     * @return the RDF subject at the center of this context
090     */
091    public com.hp.hpl.jena.graph.Node subject() {
092        return subject;
093    }
094}