001/** 002 * Copyright 2014 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.impl.rdf.impl; 017 018import com.google.common.collect.Iterators; 019import com.hp.hpl.jena.graph.Triple; 020import com.hp.hpl.jena.rdf.model.Resource; 021import org.fcrepo.kernel.models.FedoraResource; 022import org.fcrepo.kernel.identifiers.IdentifierConverter; 023import org.fcrepo.kernel.impl.rdf.impl.mappings.PropertyToTriple; 024import org.fcrepo.kernel.utils.iterators.PropertyIterator; 025 026import javax.jcr.Property; 027import javax.jcr.RepositoryException; 028 029import java.util.Iterator; 030 031/** 032 * Accumulate inbound references to a given resource 033 * 034 * @author cabeer 035 */ 036public class ReferencesRdfContext extends NodeRdfContext { 037 038 private PropertyToTriple property2triple; 039 040 /** 041 * Add the inbound references from other nodes to this resource to the stream 042 * 043 * @param resource 044 * @param idTranslator 045 * @throws javax.jcr.RepositoryException 046 */ 047 048 public ReferencesRdfContext(final FedoraResource resource, 049 final IdentifierConverter<Resource, FedoraResource> idTranslator) 050 throws RepositoryException { 051 super(resource, idTranslator); 052 property2triple = new PropertyToTriple(resource.getNode().getSession(), idTranslator); 053 concat(putStrongReferencePropertiesIntoContext()); 054 concat(putWeakReferencePropertiesIntoContext()); 055 } 056 057 private Iterator<Triple> putWeakReferencePropertiesIntoContext() throws RepositoryException { 058 final Iterator<Property> properties = new PropertyIterator(resource().getNode().getWeakReferences()); 059 060 return Iterators.concat(Iterators.transform(properties, property2triple)); 061 } 062 063 private Iterator<Triple> putStrongReferencePropertiesIntoContext() throws RepositoryException { 064 final Iterator<Property> properties = new PropertyIterator(resource().getNode().getReferences()); 065 066 return Iterators.concat(Iterators.transform(properties, property2triple)); 067 068 } 069 070}