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.google.common.collect.Iterators; 019import com.hp.hpl.jena.rdf.model.Resource; 020 021import org.fcrepo.kernel.api.exception.RepositoryRuntimeException; 022import org.fcrepo.kernel.api.models.FedoraResource; 023import org.fcrepo.kernel.api.identifiers.IdentifierConverter; 024import org.fcrepo.kernel.modeshape.rdf.impl.mappings.PropertyValueIterator; 025import org.slf4j.Logger; 026 027import javax.jcr.AccessDeniedException; 028import javax.jcr.Node; 029import javax.jcr.Property; 030import javax.jcr.RepositoryException; 031import javax.jcr.Value; 032 033import java.util.Iterator; 034import java.util.List; 035import java.util.Objects; 036import java.util.function.Function; 037 038import static java.util.Arrays.asList; 039import static org.fcrepo.kernel.api.utils.UncheckedPredicate.uncheck; 040import static org.fcrepo.kernel.modeshape.identifiers.NodeResourceConverter.nodeConverter; 041import static org.fcrepo.kernel.modeshape.rdf.converters.ValueConverter.nodeForValue; 042import static org.fcrepo.kernel.modeshape.rdf.impl.ReferencesRdfContext.REFERENCE_TYPES; 043import static org.fcrepo.kernel.modeshape.utils.FedoraTypesUtils.isSkolemNode; 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 private static final List<Class<? extends NodeRdfContext>> contexts = 058 asList(TypeRdfContext.class, PropertiesRdfContext.class, SkolemNodeRdfContext.class); 059 /** 060 * Default constructor. 061 * 062 * @param resource the resource 063 * @param idTranslator the idTranslator 064 * @throws javax.jcr.RepositoryException if repository exception occurred 065 */ 066 public SkolemNodeRdfContext(final FedoraResource resource, 067 final IdentifierConverter<Resource, FedoraResource> idTranslator) 068 throws RepositoryException { 069 super(resource, idTranslator); 070 concat(flatMap(getBlankNodesIterator(), n -> nodeConverter.convert(n).getTriples(idTranslator, contexts))); 071 } 072 073 @SuppressWarnings("unchecked") 074 private Iterator<Node> getBlankNodesIterator() throws RepositoryException { 075 final Iterator<Property> properties = resource().getNode().getProperties(); 076 077 final Iterator<Property> references = Iterators.filter(properties, 078 uncheck((final Property p) -> REFERENCE_TYPES.contains(p.getType()))::test); 079 080 final Iterator<Node> nodes = Iterators.transform(new PropertyValueIterator(references), valueToNode::apply); 081 082 return Iterators.filter(nodes, n -> Objects.nonNull(n) && isSkolemNode.test(n)); 083 } 084 085 private final Function<Value, Node> valueToNode = v -> { 086 try { 087 return nodeForValue(session(), v); 088 089 } catch (final AccessDeniedException e) { 090 LOGGER.error("Link inaccessible by requesting user: {}, {}", v, session().getUserID()); 091 return null; 092 093 } catch (final RepositoryException e) { 094 throw new RepositoryRuntimeException(e); 095 } 096 }; 097}