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 com.hp.hpl.jena.rdf.model.Resource; 019 020import org.fcrepo.kernel.api.exception.RepositoryRuntimeException; 021import org.fcrepo.kernel.api.models.FedoraResource; 022import org.fcrepo.kernel.api.identifiers.IdentifierConverter; 023import org.fcrepo.kernel.modeshape.rdf.impl.mappings.PropertyValueIterator; 024import org.slf4j.Logger; 025 026import javax.jcr.AccessDeniedException; 027import javax.jcr.Node; 028import javax.jcr.Property; 029import javax.jcr.RepositoryException; 030import javax.jcr.Session; 031import javax.jcr.Value; 032 033import java.util.Objects; 034import java.util.stream.Stream; 035import java.util.function.Function; 036 037import static org.fcrepo.kernel.api.RequiredRdfContext.PROPERTIES; 038import static org.fcrepo.kernel.modeshape.identifiers.NodeResourceConverter.nodeConverter; 039import static org.fcrepo.kernel.modeshape.rdf.converters.ValueConverter.nodeForValue; 040import static org.fcrepo.kernel.modeshape.rdf.impl.ReferencesRdfContext.REFERENCE_TYPES; 041import static org.fcrepo.kernel.modeshape.utils.FedoraTypesUtils.isSkolemNode; 042import static org.fcrepo.kernel.modeshape.utils.UncheckedPredicate.uncheck; 043import static org.fcrepo.kernel.modeshape.utils.StreamUtils.iteratorToStream; 044import static org.slf4j.LoggerFactory.getLogger; 045 046/** 047 * Embed triples describing all skolem nodes in the RDF stream 048 * 049 * @author cabeer 050 * @author ajs6f 051 * @since 10/9/14 052 */ 053public class SkolemNodeRdfContext extends NodeRdfContext { 054 055 private static final Logger LOGGER = getLogger(SkolemNodeRdfContext.class); 056 057 /** 058 * Default constructor. 059 * 060 * @param resource the resource 061 * @param idTranslator the idTranslator 062 * @throws RepositoryException if a repository exception occurred 063 */ 064 public SkolemNodeRdfContext(final FedoraResource resource, 065 final IdentifierConverter<Resource, FedoraResource> idTranslator) 066 throws RepositoryException { 067 super(resource, idTranslator); 068 069 concat(getBlankNodes(resource).flatMap(n -> nodeConverter.convert(n).getTriples(idTranslator, 070 PROPERTIES))); 071 } 072 073 @SuppressWarnings("unchecked") 074 private static Stream<Node> getBlankNodes(final FedoraResource resource) throws RepositoryException { 075 final Function<Value, Node> valueToNode = sessionValueToNode.apply(resource.getNode().getSession()); 076 final Stream<Property> refs = iteratorToStream(resource.getNode().getProperties()) 077 .filter(uncheck((final Property p) -> REFERENCE_TYPES.contains(p.getType()))); 078 return iteratorToStream(new PropertyValueIterator(refs.iterator())) 079 .map(valueToNode) 080 .filter(Objects::nonNull) 081 .filter(isSkolemNode); 082 } 083 084 private static final Function<Session, Function<Value, Node>> sessionValueToNode = session -> v -> { 085 try { 086 return nodeForValue(session, v); 087 088 } catch (final AccessDeniedException e) { 089 LOGGER.error("Link inaccessible by requesting user: {}, {}", v, session.getUserID()); 090 return null; 091 092 } catch (final RepositoryException e) { 093 throw new RepositoryRuntimeException(e); 094 } 095 }; 096}