Package 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	Description
protected class	ConstantOptimizer.ConstantVisitor
protected class	ConstantOptimizer.VarNameCollector

Field Summary

Fields

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

Constructor Summary

Constructors

Constructor	Description
ConstantOptimizer(EvaluationStrategy strategy)

Method Summary

Modifier and Type	Method	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 Details

logger

protected static final org.slf4j.Logger logger

strategy

protected final EvaluationStrategy strategy

Constructor Details

ConstantOptimizer

public ConstantOptimizer(EvaluationStrategy strategy)

Method Details

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