| /* |
| * 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.concurrent.atomic.AtomicReference; |
| |
| import org.apache.rya.api.model.VisibilityBindingSet; |
| import org.eclipse.rdf4j.model.ValueFactory; |
| import org.eclipse.rdf4j.model.impl.SimpleValueFactory; |
| import org.eclipse.rdf4j.query.algebra.Projection; |
| 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 ProjectionEvaluator}. |
| */ |
| public class ProjectionEvaluatorTest { |
| |
| /** |
| * This Projection enumerates all of the variables that were in the query, none of them are anonymous, and |
| * none of them insert constants. |
| */ |
| @Test |
| public void changesNothing() throws Exception { |
| // Read the projection object from a SPARQL query. |
| final Projection projection = getProjection( |
| "SELECT ?person ?employee ?business " + |
| "WHERE { " + |
| "?person <urn:talksTo> ?employee . " + |
| "?employee <urn:worksAt> ?business . " + |
| "}"); |
| |
| // Create a Binding Set that contains the result of the WHERE clause. |
| final ValueFactory vf = SimpleValueFactory.getInstance(); |
| final MapBindingSet bs = new MapBindingSet(); |
| bs.addBinding("person", vf.createIRI("urn:Alice")); |
| bs.addBinding("employee", vf.createIRI("urn:Bob")); |
| bs.addBinding("business", vf.createIRI("urn:TacoJoint")); |
| final VisibilityBindingSet original = new VisibilityBindingSet(bs, "a|b"); |
| |
| // Execute the projection. |
| final VisibilityBindingSet result = ProjectionEvaluator.make(projection).project(original); |
| assertEquals(original, result); |
| } |
| |
| /** |
| * This Projection replaces some of the variables names with different names. |
| */ |
| @Test |
| public void renameBindings() throws Exception { |
| // Read the projection object from a SPARQL query. |
| final Projection projection = getProjection( |
| "SELECT (?person AS ?p) (?employee AS ?e) ?business " + |
| "WHERE { " + |
| "?person <urn:talksTo> ?employee . " + |
| "?employee <urn:worksAt> ?business . " + |
| "}"); |
| |
| // Create a Binding Set that contains the result of the WHERE clause. |
| final ValueFactory vf = SimpleValueFactory.getInstance(); |
| MapBindingSet bs = new MapBindingSet(); |
| bs.addBinding("person", vf.createIRI("urn:Alice")); |
| bs.addBinding("employee", vf.createIRI("urn:Bob")); |
| bs.addBinding("business", vf.createIRI("urn:TacoJoint")); |
| final VisibilityBindingSet original = new VisibilityBindingSet(bs, "a|b"); |
| |
| // The expected binding set changes the "person" binding name to "p" and "employee" to "e". |
| bs = new MapBindingSet(); |
| bs.addBinding("p", vf.createIRI("urn:Alice")); |
| bs.addBinding("e", vf.createIRI("urn:Bob")); |
| bs.addBinding("business", vf.createIRI("urn:TacoJoint")); |
| final VisibilityBindingSet expected = new VisibilityBindingSet(bs, "a|b"); |
| |
| // Execute the projection. |
| final VisibilityBindingSet result = ProjectionEvaluator.make(projection).project(original); |
| assertEquals(expected, result); |
| } |
| |
| /** |
| * This projection drops a binding from the original Binding Set. |
| */ |
| @Test |
| public void dropsBinding() throws Exception { |
| // Read the projection object from a SPARQL query. |
| final Projection projection = getProjection( |
| "SELECT ?person " + |
| "WHERE { " + |
| "?person <urn:talksTo> ?employee . " + |
| "?employee <urn:worksAt> ?business . " + |
| "}"); |
| |
| // Create a Binding Set that contains the result of the WHERE clause. |
| final ValueFactory vf = SimpleValueFactory.getInstance(); |
| MapBindingSet bs = new MapBindingSet(); |
| bs.addBinding("person", vf.createIRI("urn:Alice")); |
| bs.addBinding("employee", vf.createIRI("urn:Bob")); |
| bs.addBinding("business", vf.createIRI("urn:TacoJoint")); |
| final VisibilityBindingSet original = new VisibilityBindingSet(bs, "a|b"); |
| |
| // The expected binding set only has the "person" binding. |
| bs = new MapBindingSet(); |
| bs.addBinding("person", vf.createIRI("urn:Alice")); |
| final VisibilityBindingSet expected = new VisibilityBindingSet(bs, "a|b"); |
| |
| // Execute the projection. |
| final VisibilityBindingSet result = ProjectionEvaluator.make(projection).project(original); |
| assertEquals(expected, result); |
| } |
| |
| /** |
| * This projection creates a Binding Set that represents a Statement and add a constant value to it. |
| */ |
| @Test |
| public void addsConstantBinding() throws Exception { |
| // Read the projection object from a SPARQL query. |
| final Projection projection = getProjection( |
| "CONSTRUCT { ?person <urn:hasGrandchild> ?grandchild } " + |
| "WHERE {" + |
| "?person <urn:hasChild> ?child ." + |
| "?child <urn:hasChild> ?grandchild . " + |
| "}"); |
| |
| // Create a Binding Set that contains the result of the WHERE clause. |
| final ValueFactory vf = SimpleValueFactory.getInstance(); |
| MapBindingSet bs = new MapBindingSet(); |
| bs.addBinding("person", vf.createIRI("urn:Alice")); |
| bs.addBinding("child", vf.createIRI("urn:Bob")); |
| bs.addBinding("grandchild", vf.createIRI("urn:Charlie")); |
| final VisibilityBindingSet original = new VisibilityBindingSet(bs, "a|b"); |
| |
| // The expected binding set represents a statement. |
| bs = new MapBindingSet(); |
| bs.addBinding("subject", vf.createIRI("urn:Alice")); |
| bs.addBinding("predicate", vf.createIRI("urn:hasGrandchild")); |
| bs.addBinding("object", vf.createIRI("urn:Charlie")); |
| final VisibilityBindingSet expected = new VisibilityBindingSet(bs, "a|b"); |
| |
| // Execute the projection. |
| final VisibilityBindingSet result = ProjectionEvaluator.make(projection).project(original); |
| assertEquals(expected, result); |
| } |
| |
| /** |
| * This projection creates a Binding Set that represents a Statement that has a blank node added to it. |
| */ |
| @Test |
| public void addsBlankNodeBinding() throws Exception { |
| // Read the projection object from a SPARQL query. |
| final Projection projection = getProjection( |
| "CONSTRUCT { ?person <urn:hasChild> _:b } " + |
| "WHERE {" + |
| "?person <urn:hasGrandchild> ?grandchild ." + |
| "}"); |
| |
| // Create a Binding Set that contains the result of the WHERE clause. |
| final ValueFactory vf = SimpleValueFactory.getInstance(); |
| MapBindingSet bs = new MapBindingSet(); |
| bs.addBinding("person", vf.createIRI("urn:Alice")); |
| bs.addBinding("hasGrandchild", vf.createIRI("urn:Bob")); |
| final VisibilityBindingSet original = new VisibilityBindingSet(bs, "a|b"); |
| |
| // Execute the projection. |
| final VisibilityBindingSet result = ProjectionEvaluator.make(projection).project(original); |
| |
| // The expected binding set represents a statement. We need to get the blank node's id from the |
| // result since that is different every time. |
| bs = new MapBindingSet(); |
| bs.addBinding("subject", vf.createIRI("urn:Alice")); |
| bs.addBinding("predicate", vf.createIRI("urn:hasChild")); |
| bs.addBinding("object", result.getValue("object")); |
| final VisibilityBindingSet expected = new VisibilityBindingSet(bs, "a|b"); |
| |
| assertEquals(expected, result); |
| } |
| |
| /** |
| * Get the first {@link Projection} node from a SPARQL query. |
| * |
| * @param sparql - The query that contains a single Projection node. |
| * @return The first {@link Projection} that is encountered. |
| * @throws Exception The query could not be parsed. |
| */ |
| public static @Nullable Projection getProjection(final String sparql) throws Exception { |
| requireNonNull(sparql); |
| |
| final AtomicReference<Projection> projection = new AtomicReference<>(); |
| final ParsedQuery parsed = new SPARQLParser().parseQuery(sparql, null); |
| parsed.getTupleExpr().visit(new AbstractQueryModelVisitor<Exception>() { |
| @Override |
| public void meet(final Projection node) throws Exception { |
| projection.set(node); |
| } |
| }); |
| |
| return projection.get(); |
| } |
| } |