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Issue #164: extended query eval strategy
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47 changes: 47 additions & 0 deletions
47
...main/java/org/eclipse/rdf4j/query/algebra/evaluation/impl/ExtendedEvaluationStrategy.java
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| /** | ||
| * Copyright (c) 2016 Eclipse RDF4J contributors. | ||
| * All rights reserved. This program and the accompanying materials | ||
| * are made available under the terms of the Eclipse Distribution License v1.0 | ||
| * which accompanies this distribution, and is available at | ||
| * http://www.eclipse.org/org/documents/edl-v10.php. | ||
| */ | ||
| package org.eclipse.rdf4j.query.algebra.evaluation.impl; | ||
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| import org.eclipse.rdf4j.model.Value; | ||
| import org.eclipse.rdf4j.model.impl.BooleanLiteral; | ||
| import org.eclipse.rdf4j.query.BindingSet; | ||
| import org.eclipse.rdf4j.query.Dataset; | ||
| import org.eclipse.rdf4j.query.QueryEvaluationException; | ||
| import org.eclipse.rdf4j.query.algebra.Compare; | ||
| import org.eclipse.rdf4j.query.algebra.evaluation.TripleSource; | ||
| import org.eclipse.rdf4j.query.algebra.evaluation.ValueExprEvaluationException; | ||
| import org.eclipse.rdf4j.query.algebra.evaluation.federation.FederatedServiceResolver; | ||
| import org.eclipse.rdf4j.query.algebra.evaluation.util.QueryEvaluationUtil; | ||
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| /** | ||
| * SPARQL 1.1 extended query evaluation strategy. This strategy adds the use of virtual properties, as well as | ||
| * extended comparison operators to the minimally-conforming {@link StrictEvaluationStrategy}. | ||
| * | ||
| * @author Jeen Broekstra | ||
| */ | ||
| public class ExtendedEvaluationStrategy extends TupleFunctionEvaluationStrategy { | ||
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| public ExtendedEvaluationStrategy(TripleSource tripleSource, Dataset dataset, | ||
| FederatedServiceResolver serviceResolver) | ||
| { | ||
| super(tripleSource, dataset, serviceResolver); | ||
| } | ||
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| @Override | ||
| public Value evaluate(Compare node, BindingSet bindings) | ||
| throws ValueExprEvaluationException, QueryEvaluationException | ||
| { | ||
| Value leftVal = evaluate(node.getLeftArg(), bindings); | ||
| Value rightVal = evaluate(node.getRightArg(), bindings); | ||
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| // return result of non-strict comparison. | ||
| return BooleanLiteral.valueOf( | ||
| QueryEvaluationUtil.compare(leftVal, rightVal, node.getOperator(), false)); | ||
| } | ||
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| } |
43 changes: 43 additions & 0 deletions
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...va/org/eclipse/rdf4j/query/algebra/evaluation/impl/ExtendedEvaluationStrategyFactory.java
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| /******************************************************************************* | ||
| * Copyright (c) 2016 Eclipse RDF4J contributors. | ||
| * All rights reserved. This program and the accompanying materials | ||
| * are made available under the terms of the Eclipse Distribution License v1.0 | ||
| * which accompanies this distribution, and is available at | ||
| * http://www.eclipse.org/org/documents/edl-v10.php. | ||
| *******************************************************************************/ | ||
| package org.eclipse.rdf4j.query.algebra.evaluation.impl; | ||
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| import org.eclipse.rdf4j.query.Dataset; | ||
| import org.eclipse.rdf4j.query.algebra.evaluation.EvaluationStrategy; | ||
| import org.eclipse.rdf4j.query.algebra.evaluation.EvaluationStrategyFactory; | ||
| import org.eclipse.rdf4j.query.algebra.evaluation.TripleSource; | ||
| import org.eclipse.rdf4j.query.algebra.evaluation.federation.FederatedServiceResolver; | ||
| import org.eclipse.rdf4j.query.algebra.evaluation.federation.FederatedServiceResolverClient; | ||
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| public class ExtendedEvaluationStrategyFactory | ||
| implements EvaluationStrategyFactory, FederatedServiceResolverClient | ||
| { | ||
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| private FederatedServiceResolver serviceResolver; | ||
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| public ExtendedEvaluationStrategyFactory() { | ||
| } | ||
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| public ExtendedEvaluationStrategyFactory(FederatedServiceResolver resolver) { | ||
| this.serviceResolver = resolver; | ||
| } | ||
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| @Override | ||
| public void setFederatedServiceResolver(FederatedServiceResolver resolver) { | ||
| this.serviceResolver = resolver; | ||
| } | ||
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| public FederatedServiceResolver getFederatedServiceResolver() { | ||
| return serviceResolver; | ||
| } | ||
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| @Override | ||
| public EvaluationStrategy createEvaluationStrategy(Dataset dataset, TripleSource tripleSource) { | ||
| return new ExtendedEvaluationStrategy(tripleSource, dataset, serviceResolver); | ||
| } | ||
| } |
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