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.http.commons.api.rdf; 017 018import static java.util.Spliterator.IMMUTABLE; 019import static java.util.Spliterators.spliteratorUnknownSize; 020import static java.util.stream.Stream.concat; 021import static java.util.stream.StreamSupport.stream; 022 023import static org.slf4j.LoggerFactory.getLogger; 024 025import java.util.Map; 026 027import javax.ws.rs.core.UriInfo; 028 029import com.hp.hpl.jena.rdf.model.Resource; 030import com.hp.hpl.jena.rdf.model.Statement; 031 032import org.fcrepo.kernel.api.identifiers.IdentifierConverter; 033import org.fcrepo.kernel.api.models.FedoraResource; 034import org.fcrepo.kernel.api.rdf.DefaultRdfStream; 035import org.fcrepo.kernel.api.RdfStream; 036 037import org.slf4j.Logger; 038import org.springframework.context.ApplicationContext; 039import org.springframework.context.ApplicationContextAware; 040import org.springframework.stereotype.Component; 041 042/** 043 * Utility for injecting HTTP-contextual data into an RdfStream 044 * 045 * @author awoods 046 */ 047@Component 048public class HttpTripleUtil implements ApplicationContextAware { 049 050 private static final Logger LOGGER = getLogger(HttpTripleUtil.class); 051 052 private ApplicationContext applicationContext; 053 054 @Override 055 public void setApplicationContext(final ApplicationContext applicationContext) { 056 this.applicationContext = applicationContext; 057 } 058 059 /** 060 * Add additional models to the RDF dataset for the given resource 061 * 062 * @param rdfStream the source stream we'll add named models to 063 * @param resource the FedoraResourceImpl in question 064 * @param uriInfo a JAX-RS UriInfo object to build URIs to resources 065 * @param idTranslator the id translator 066 * @return an RdfStream with the added triples 067 */ 068 public RdfStream addHttpComponentModelsForResourceToStream(final RdfStream rdfStream, 069 final FedoraResource resource, final UriInfo uriInfo, 070 final IdentifierConverter<Resource,FedoraResource> idTranslator) { 071 072 LOGGER.debug("Adding additional HTTP context triples to stream"); 073 return new DefaultRdfStream(rdfStream.topic(), concat(rdfStream, getUriAwareTripleFactories().entrySet() 074 .stream().flatMap(e -> { 075 LOGGER.debug("Adding response information using: {}", e.getKey()); 076 return stream(spliteratorUnknownSize(e.getValue().createModelForResource(resource, uriInfo, 077 idTranslator).listStatements(), IMMUTABLE), false).map(Statement::asTriple); 078 }))); 079 } 080 081 private Map<String, UriAwareResourceModelFactory> getUriAwareTripleFactories() { 082 return applicationContext 083 .getBeansOfType(UriAwareResourceModelFactory.class); 084 } 085}