org.openrdf.query.algebra.evaluation.impl
Class ConstantOptimizer

java.lang.Object
  org.openrdf.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

protected class

ConstantOptimizer.ConstantVisitor

Field Summary

protected Logger	logger
protected EvaluationStrategy	strategy

Constructor Summary

ConstantOptimizer(EvaluationStrategy strategy)

Method Summary

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 final 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