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 java.util.stream.Stream.of; 021import static org.apache.jena.graph.NodeFactory.createLiteral; 022import static org.apache.jena.graph.Triple.create; 023import static org.apache.jena.rdf.model.ResourceFactory.createProperty; 024import static org.apache.jena.rdf.model.ResourceFactory.createTypedLiteral; 025import static org.fcrepo.kernel.api.FedoraTypes.FCR_VERSIONS; 026import static org.fcrepo.kernel.api.RdfLexicon.CREATED_DATE; 027import static org.fcrepo.kernel.api.RdfLexicon.HAS_VERSION; 028import static org.fcrepo.kernel.api.RdfLexicon.HAS_VERSION_LABEL; 029import static org.slf4j.LoggerFactory.getLogger; 030 031import java.util.Calendar; 032import java.util.stream.Stream; 033 034import org.apache.jena.rdf.model.Resource; 035import org.modeshape.common.text.UrlEncoder; 036 037import org.fcrepo.kernel.api.identifiers.IdentifierConverter; 038import org.fcrepo.kernel.api.models.FedoraResource; 039import org.fcrepo.kernel.api.rdf.DefaultRdfStream; 040 041import org.apache.jena.graph.Node; 042import org.apache.jena.graph.Triple; 043 044import org.slf4j.Logger; 045 046 047/** 048 * {@link org.fcrepo.kernel.api.RdfStream} that supplies {@link Triple}s concerning 049 * the versions of a selected {@link Node}. 050 * 051 * @author ajs6f 052 * @since Oct 15, 2013 053 */ 054public class VersionsRdfContext extends DefaultRdfStream { 055 056 private final FedoraResource resource; 057 058 private static final Logger LOGGER = getLogger(VersionsRdfContext.class); 059 060 private static final UrlEncoder URL_ENCODER = new UrlEncoder(); 061 062 /** 063 * Ordinary constructor. 064 * 065 * @param resource the resource 066 * @param idTranslator the id translator 067 */ 068 public VersionsRdfContext(final FedoraResource resource, 069 final IdentifierConverter<Resource, FedoraResource> idTranslator) { 070 super(idTranslator.reverse().convert(resource).asNode()); 071 this.resource = resource; 072 concat(versionTriples()); 073 } 074 075 @SuppressWarnings("unchecked") 076 private Stream<Triple> versionTriples() { 077 return resource.getVersions() 078 .flatMap(version -> { 079 final Node versionSubject = createProperty(topic() + "/" + FCR_VERSIONS + "/" + 080 urlEncode(version.getIdentifier())).asNode(); 081 082 final Calendar cal = new Calendar.Builder().setInstant(version.getCreated().toEpochMilli()).build(); 083 return of( 084 create(topic(), HAS_VERSION.asNode(), versionSubject), 085 create(versionSubject, HAS_VERSION_LABEL.asNode(), createLiteral(version.getIdentifier())), 086 create(versionSubject, CREATED_DATE.asNode(), createTypedLiteral(cal).asNode())); 087 }); 088 } 089 090 private String urlEncode(final String string) { 091 return URL_ENCODER.encode(string).replaceAll("[+]", "%20"); 092 } 093}