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.modeshape.rdf.impl; 017 018import static org.fcrepo.kernel.modeshape.identifiers.NodeResourceConverter.nodeToResource; 019 020import javax.jcr.Node; 021import javax.jcr.RepositoryException; 022 023import org.fcrepo.kernel.api.exception.RepositoryRuntimeException; 024import org.fcrepo.kernel.api.identifiers.IdentifierConverter; 025import org.fcrepo.kernel.api.models.FedoraResource; 026import org.fcrepo.kernel.api.utils.iterators.RdfStream; 027 028import com.google.common.base.Converter; 029import com.hp.hpl.jena.rdf.model.Resource; 030 031/** 032 * {@link RdfStream} that holds contexts related to a specific {@link Node}. 033 * 034 * @author ajs6f 035 * @since Oct 10, 2013 036 */ 037public class NodeRdfContext extends RdfStream { 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 /** 047 * Default constructor. 048 * 049 * @param resource the resource 050 * @param idTranslator the id translator 051 */ 052 public NodeRdfContext(final FedoraResource resource, 053 final IdentifierConverter<Resource, FedoraResource> idTranslator) { 054 super(); 055 this.resource = resource; 056 this.idTranslator = idTranslator; 057 this.subject = uriFor(resource); 058 try { 059 session(resource.getNode().getSession()); 060 } catch (final RepositoryException ex) { 061 throw new RepositoryRuntimeException(ex); 062 } 063 } 064 065 /** 066 * @return The {@link Node} in question 067 */ 068 public FedoraResource resource() { 069 return resource; 070 } 071 072 /** 073 * @return local {@link org.fcrepo.kernel.api.identifiers.IdentifierConverter} 074 */ 075 public IdentifierConverter<Resource, FedoraResource> translator() { 076 return idTranslator; 077 } 078 079 /** 080 * @param resource a Fedora model instance that must be identified by an URI 081 * @return a translated URI for that resource 082 */ 083 protected com.hp.hpl.jena.graph.Node uriFor(final FedoraResource resource) { 084 return translator().reverse().convert(resource).asNode(); 085 } 086 087 /** 088 * @return local {@link org.fcrepo.kernel.api.identifiers.IdentifierConverter} 089 */ 090 public Converter<Node, Resource> nodeConverter() { 091 return nodeToResource(idTranslator); 092 } 093 094 /** 095 * @return the RDF subject at the center of this context 096 */ 097 public com.hp.hpl.jena.graph.Node subject() { 098 return subject; 099 } 100}