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Distinguishing between managed and unmanaged RDF
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fcrepo-kernel/src/main/java/org/fcrepo/kernel/utils/iterators/UnmanagedRdfStream.java
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| /** | ||
| * Copyright 2013 DuraSpace, Inc. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
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| package org.fcrepo.kernel.utils.iterators; | ||
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| import static com.google.common.base.Predicates.not; | ||
| import static com.google.common.collect.Iterators.filter; | ||
| import static com.hp.hpl.jena.rdf.model.ModelFactory.createDefaultModel; | ||
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| import static org.fcrepo.kernel.RdfLexicon.isManagedPredicate; | ||
| import java.util.Iterator; | ||
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| import com.google.common.base.Predicate; | ||
| import com.hp.hpl.jena.graph.Triple; | ||
| import com.hp.hpl.jena.rdf.model.Model; | ||
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| /** | ||
| * This wraps an {@link Iterator} of {@link Triple}s and produces only those | ||
| * safe for persistence into the repo as properties. It does this by filtering | ||
| * all triples with managed predicates, as defined in {@link RdfLexicon}. | ||
| * | ||
| * @author ajs6f | ||
| * @date Oct 23, 2013 | ||
| */ | ||
| public class UnmanagedRdfStream extends RdfStream { | ||
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| private static final Model model = createDefaultModel(); | ||
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| private static final Predicate<Triple> isManagedTriple = | ||
| new Predicate<Triple>() { | ||
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| @Override | ||
| public boolean apply(final Triple t) { | ||
| return isManagedPredicate.apply(model.asStatement(t) | ||
| .getPredicate()); | ||
| } | ||
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| }; | ||
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| /** | ||
| * Ordinary constructor. | ||
| * | ||
| * @param triples | ||
| */ | ||
| public UnmanagedRdfStream(final Iterator<Triple> triples) { | ||
| super(triples); | ||
| } | ||
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| @Override | ||
| protected Iterator<Triple> delegate() { | ||
| return filter(triples, not(isManagedTriple)); | ||
| } | ||
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| } |
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