org.eclipse.rdf4j.query.algebra.evaluation.impl

Class ConstantOptimizer

java.lang.Object

org.eclipse.rdf4j.query.algebra.evaluation.impl.ConstantOptimizer

All Implemented Interfaces:

QueryOptimizer

public class ConstantOptimizer
extends Object
implements QueryOptimizer

A query optimizer that optimizes constant value expressions.

Author:

James Leigh, Arjohn Kampman

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected class	ConstantOptimizer.ConstantVisitor
protected class	ConstantOptimizer.VarNameCollector

Field Summary

Fields

Modifier and Type	Field and Description
protected static org.slf4j.Logger	logger
protected EvaluationStrategy	strategy

Constructor Summary

Constructors

Constructor and Description
ConstantOptimizer(EvaluationStrategy strategy)

Method Summary

Modifier and Type	Method and Description
void	optimize(TupleExpr tupleExpr, Dataset dataset, BindingSet bindings) Applies generally applicable optimizations to the supplied query: variable assignments are inlined.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

logger

protected static final org.slf4j.Logger logger

strategy

protected final EvaluationStrategy strategy

Constructor Detail

ConstantOptimizer

public ConstantOptimizer(EvaluationStrategy strategy)

Method Detail

optimize

public void optimize(TupleExpr tupleExpr,
                     Dataset dataset,
                     BindingSet bindings)

Applies generally applicable optimizations to the supplied query: variable assignments are inlined.

Specified by:

optimize in interface QueryOptimizer