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.graph.Triple;
019import com.hp.hpl.jena.rdf.model.Resource;
020
021import org.fcrepo.kernel.api.identifiers.IdentifierConverter;
022import org.fcrepo.kernel.api.models.FedoraResource;
023
024import javax.jcr.Node;
025import javax.jcr.RepositoryException;
026
027import java.util.function.Predicate;
028import java.util.stream.Stream;
029
030import static com.hp.hpl.jena.vocabulary.RDF.type;
031import static org.fcrepo.kernel.api.RdfLexicon.isManagedNamespace;
032import static org.fcrepo.kernel.api.RequiredRdfContext.PROPERTIES;
033import static org.fcrepo.kernel.modeshape.identifiers.NodeResourceConverter.nodeConverter;
034import static org.fcrepo.kernel.modeshape.rdf.ManagedRdf.isManagedTriple;
035import static org.fcrepo.kernel.modeshape.utils.StreamUtils.iteratorToStream;
036
037/**
038 * @author cabeer
039 * @author ajs6f
040 * @since 10/9/14
041 */
042public class HashRdfContext extends NodeRdfContext {
043
044    private static final Predicate<Triple> IS_MANAGED_TYPE = t -> t.getPredicate().equals(type.asNode()) &&
045            isManagedNamespace.test(t.getObject().getNameSpace());
046
047    private static final Predicate<Triple> IS_MANAGED_TRIPLE = IS_MANAGED_TYPE.or(isManagedTriple);
048
049    /**
050     * Default constructor.
051     *
052     * @param resource the resource
053     * @param idTranslator the id translator
054     * @throws javax.jcr.RepositoryException if repository exception occurred
055     */
056    public HashRdfContext(final FedoraResource resource,
057                          final IdentifierConverter<Resource, FedoraResource> idTranslator)
058            throws RepositoryException {
059        super(resource, idTranslator);
060
061        concat(getNodeStream(resource)
062                .flatMap(n -> nodeConverter.convert(n).getTriples(idTranslator, PROPERTIES))
063                .filter(IS_MANAGED_TRIPLE.negate()));
064    }
065
066    @SuppressWarnings("unchecked")
067    private static Stream<Node> getNodeStream(final FedoraResource resource) throws RepositoryException {
068        final Node node = resource.getNode();
069        if (node.hasNode("#")) {
070            return iteratorToStream(node.getNode("#").getNodes());
071        }
072        return Stream.empty();
073    }
074}