| /* |
| * 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. |
| */ |
| package org.apache.rya.api.function.projection; |
| |
| import static java.util.Objects.requireNonNull; |
| import static org.junit.Assert.assertEquals; |
| |
| import java.util.HashSet; |
| import java.util.Set; |
| import java.util.UUID; |
| import java.util.concurrent.atomic.AtomicReference; |
| |
| import org.apache.rya.api.model.VisibilityBindingSet; |
| import org.eclipse.rdf4j.model.BNode; |
| import org.eclipse.rdf4j.model.Value; |
| import org.eclipse.rdf4j.model.ValueFactory; |
| import org.eclipse.rdf4j.model.impl.SimpleValueFactory; |
| import org.eclipse.rdf4j.model.vocabulary.RDF; |
| import org.eclipse.rdf4j.model.vocabulary.XMLSchema; |
| import org.eclipse.rdf4j.query.algebra.MultiProjection; |
| import org.eclipse.rdf4j.query.algebra.helpers.AbstractQueryModelVisitor; |
| import org.eclipse.rdf4j.query.impl.MapBindingSet; |
| import org.eclipse.rdf4j.query.parser.ParsedQuery; |
| import org.eclipse.rdf4j.query.parser.sparql.SPARQLParser; |
| import org.junit.Test; |
| |
| import edu.umd.cs.findbugs.annotations.Nullable; |
| |
| /** |
| * Unit tests the methods of {@link MultiProjectionEvaluator}. |
| */ |
| public class MultiProjectionEvaluatorTest { |
| |
| @Test |
| public void singleBlankNode() throws Exception { |
| // Read the multi projection object from a SPARQL query. |
| final MultiProjection multiProjection = getMultiProjection( |
| "CONSTRUCT {" + |
| "_:b a <urn:movementObservation> ; " + |
| "<urn:location> ?location ; " + |
| "<urn:direction> ?direction ; " + |
| "}" + |
| "WHERE {" + |
| "?thing <urn:corner> ?location ." + |
| "?thing <urn:compass> ?direction." + |
| "}"); |
| |
| // Create a Binding Set that contains the result of the WHERE clause. |
| final ValueFactory vf = SimpleValueFactory.getInstance(); |
| MapBindingSet bs = new MapBindingSet(); |
| bs.addBinding("location", vf.createLiteral("South St and 5th St")); |
| bs.addBinding("direction", vf.createLiteral("NW")); |
| final VisibilityBindingSet original = new VisibilityBindingSet(bs, "a|b"); |
| |
| // Create the expected results. |
| final Set<VisibilityBindingSet> expected = new HashSet<>(); |
| final String blankNodeId = UUID.randomUUID().toString(); |
| final BNode blankNode = vf.createBNode(blankNodeId); |
| |
| bs = new MapBindingSet(); |
| bs.addBinding("subject", blankNode); |
| bs.addBinding("predicate", RDF.TYPE); |
| bs.addBinding("object", vf.createIRI("urn:movementObservation")); |
| expected.add( new VisibilityBindingSet(bs, "a|b") ); |
| |
| bs = new MapBindingSet(); |
| bs.addBinding("subject", blankNode); |
| bs.addBinding("predicate", vf.createIRI("urn:location")); |
| bs.addBinding("object", vf.createLiteral("South St and 5th St")); |
| expected.add( new VisibilityBindingSet(bs, "a|b") ); |
| |
| bs = new MapBindingSet(); |
| bs.addBinding("subject", blankNode); |
| bs.addBinding("predicate", vf.createIRI("urn:direction")); |
| bs.addBinding("object", vf.createLiteral("NW")); |
| expected.add( new VisibilityBindingSet(bs, "a|b") ); |
| |
| // Run the projection evaluator. |
| final Set<VisibilityBindingSet> results = MultiProjectionEvaluator.make(multiProjection, () -> blankNodeId).project(original); |
| |
| // The expected binding sets. |
| assertEquals(expected, results); |
| } |
| |
| @Test |
| public void multipleBlanknodes() throws Exception { |
| // Read the multi projection object from a SPARQL query. |
| final MultiProjection multiProjection = getMultiProjection( |
| "CONSTRUCT {" + |
| "_:b a <urn:vehicle> . " + |
| "_:b <urn:tiresCount> 4 ." + |
| "_:c a <urn:pet> . " + |
| "_:c <urn:isDead> false . " + |
| "}" + |
| "WHERE {" + |
| "?vehicle <urn:owner> ?owner . " + |
| "?vehicle <urn:plates> ?plates . " + |
| "?pet <urn:owner> ?owner . " + |
| "?pet <urn:isLiving> true . " + |
| "}"); |
| |
| // Create a Binding Set that contains the result of the WHERE clause. |
| final ValueFactory vf = SimpleValueFactory.getInstance(); |
| MapBindingSet bs = new MapBindingSet(); |
| bs.addBinding("vehicle", vf.createLiteral("Alice's car")); |
| bs.addBinding("owner", vf.createIRI("urn:Alice")); |
| bs.addBinding("plates", vf.createLiteral("XXXXXXX")); |
| bs.addBinding("pet", vf.createIRI("urn:Kitty")); |
| final VisibilityBindingSet original = new VisibilityBindingSet(bs, "a|b"); |
| |
| // Run the projection evaluator. |
| final Set<VisibilityBindingSet> results = MultiProjectionEvaluator.make(multiProjection, new RandomUUIDFactory()).project(original); |
| |
| // Figure out the blank nodes. |
| Value vehicalBNode = null; |
| Value petBNode = null; |
| for(final VisibilityBindingSet result : results) { |
| final Value object = result.getValue("object"); |
| if(object.equals(vf.createIRI("urn:vehicle"))) { |
| vehicalBNode = result.getValue("subject"); |
| } else if(object.equals(vf.createIRI("urn:pet"))) { |
| petBNode = result.getValue("subject"); |
| } |
| } |
| |
| // The expected binding sets. |
| final Set<VisibilityBindingSet> expected = new HashSet<>(); |
| |
| bs = new MapBindingSet(); |
| bs.addBinding("subject", vehicalBNode); |
| bs.addBinding("predicate", RDF.TYPE); |
| bs.addBinding("object", vf.createIRI("urn:vehicle")); |
| expected.add( new VisibilityBindingSet(bs, "a|b") ); |
| |
| bs = new MapBindingSet(); |
| bs.addBinding("subject", vehicalBNode); |
| bs.addBinding("predicate", vf.createIRI("urn:tiresCount")); |
| bs.addBinding("object", vf.createLiteral("4", XMLSchema.INTEGER)); |
| expected.add( new VisibilityBindingSet(bs, "a|b") ); |
| |
| bs = new MapBindingSet(); |
| bs.addBinding("subject", petBNode); |
| bs.addBinding("predicate", RDF.TYPE); |
| bs.addBinding("object", vf.createIRI("urn:pet")); |
| expected.add( new VisibilityBindingSet(bs, "a|b") ); |
| |
| bs = new MapBindingSet(); |
| bs.addBinding("subject", petBNode); |
| bs.addBinding("predicate", vf.createIRI("urn:isDead")); |
| bs.addBinding("object", vf.createLiteral(false)); |
| expected.add( new VisibilityBindingSet(bs, "a|b") ); |
| |
| assertEquals(expected, results); |
| } |
| |
| /** |
| * Get the first {@link MultiProjection} node from a SPARQL query. |
| * |
| * @param sparql - The query that contains a single Projection node. |
| * @return The first {@link MultiProjection} that is encountered. |
| * @throws Exception The query could not be parsed. |
| */ |
| public static @Nullable MultiProjection getMultiProjection(final String sparql) throws Exception { |
| requireNonNull(sparql); |
| |
| final AtomicReference<MultiProjection> multiProjection = new AtomicReference<>(); |
| final ParsedQuery parsed = new SPARQLParser().parseQuery(sparql, null); |
| parsed.getTupleExpr().visit(new AbstractQueryModelVisitor<Exception>() { |
| @Override |
| public void meet(final MultiProjection node) throws Exception { |
| multiProjection.set(node); |
| } |
| }); |
| |
| return multiProjection.get(); |
| } |
| } |