| package org.apache.rya.rdftriplestore.inference; |
| |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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. |
| */ |
| |
| |
| |
| import org.apache.rya.api.RdfCloudTripleStoreConfiguration; |
| import org.openrdf.model.URI; |
| import org.openrdf.model.vocabulary.RDF; |
| import org.openrdf.model.vocabulary.RDFS; |
| import org.openrdf.model.vocabulary.SESAME; |
| import org.openrdf.query.algebra.StatementPattern; |
| import org.openrdf.query.algebra.Union; |
| import org.openrdf.query.algebra.Var; |
| |
| /** |
| * All predicates are changed |
| * Class SubPropertyOfVisitor |
| * Date: Mar 29, 2011 |
| * Time: 11:28:34 AM |
| */ |
| public class InverseOfVisitor extends AbstractInferVisitor { |
| |
| public InverseOfVisitor(RdfCloudTripleStoreConfiguration conf, InferenceEngine inferenceEngine) { |
| super(conf, inferenceEngine); |
| include = conf.isInferInverseOf(); |
| } |
| |
| @Override |
| protected void meetSP(StatementPattern node) throws Exception { |
| StatementPattern sp = node.clone(); |
| final Var predVar = sp.getPredicateVar(); |
| |
| URI pred = (URI) predVar.getValue(); |
| String predNamespace = pred.getNamespace(); |
| |
| final Var objVar = sp.getObjectVar(); |
| final Var cntxtVar = sp.getContextVar(); |
| if (objVar != null && |
| !RDF.NAMESPACE.equals(predNamespace) && |
| !SESAME.NAMESPACE.equals(predNamespace) && |
| !RDFS.NAMESPACE.equals(predNamespace) |
| && !EXPANDED.equals(cntxtVar)) { |
| /** |
| * |
| * { ?a ?pred ?b .}\n" + |
| " UNION " + |
| " { ?b ?pred ?a } |
| */ |
| |
| URI predUri = (URI) predVar.getValue(); |
| URI invPropUri = inferenceEngine.findInverseOf(predUri); |
| if (invPropUri != null) { |
| Var subjVar = sp.getSubjectVar(); |
| Union union = new InferUnion(); |
| union.setLeftArg(sp); |
| union.setRightArg(new StatementPattern(objVar, new Var(predVar.getName(), invPropUri), subjVar, cntxtVar)); |
| node.replaceWith(union); |
| } |
| } |
| } |
| |
| } |