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 com.hp.hpl.jena.graph.Node; 019import com.hp.hpl.jena.graph.Triple; 020import com.hp.hpl.jena.rdf.model.Resource; 021import org.fcrepo.kernel.FedoraJcrTypes; 022import org.fcrepo.kernel.models.FedoraResource; 023import org.fcrepo.kernel.identifiers.IdentifierConverter; 024import org.fcrepo.kernel.utils.iterators.RdfStream; 025import org.slf4j.Logger; 026 027import javax.jcr.RepositoryException; 028 029import java.util.Iterator; 030 031import static com.hp.hpl.jena.graph.Triple.create; 032import static org.fcrepo.kernel.RdfLexicon.HAS_PARENT; 033import static org.slf4j.LoggerFactory.getLogger; 034 035/** 036 * @author cabeer 037 * @since 9/16/14 038 */ 039public class ParentRdfContext extends NodeRdfContext { 040 041 private static final Logger LOGGER = getLogger(ParentRdfContext.class); 042 043 /** 044 * Default constructor. 045 * 046 * @param resource 047 * @param idTranslator 048 * @throws javax.jcr.RepositoryException 049 */ 050 public ParentRdfContext(final FedoraResource resource, 051 final IdentifierConverter<Resource, FedoraResource> idTranslator) 052 throws RepositoryException { 053 super(resource, idTranslator); 054 055 if (resource.getNode().getDepth() > 0) { 056 LOGGER.trace("Determined that this resource has a parent."); 057 concat(parentContext()); 058 } 059 } 060 061 private Iterator<Triple> parentContext() { 062 final RdfStream parentStream = new RdfStream(); 063 // The parent node of a frozen node for a versionable resource in the 064 // jcr:system space is not a node we want to link to. 065 if (!resource().isFrozenResource() || !resource().getUnfrozenResource().hasType(FedoraJcrTypes.VERSIONABLE)) { 066 final Node containerSubject = translator().reverse().convert(resource().getContainer()).asNode(); 067 parentStream.concat(create(subject(), HAS_PARENT.asNode(), containerSubject)); 068 } 069 return parentStream; 070 } 071}