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

Class CompareOptimizer

java.lang.Object

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

All Implemented Interfaces:

QueryOptimizer

public class CompareOptimizer
extends Object
implements QueryOptimizer

A query optimizer that replaces Compare operators with SameTerms, if possible.

Author:

Arjohn Kampman

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected static class	CompareOptimizer.CompareVisitor

Constructor Summary

Constructors

Constructor and Description
CompareOptimizer()

Method Summary

Modifier and Type	Method and Description
void	optimize(org.eclipse.rdf4j.query.algebra.TupleExpr tupleExpr, org.eclipse.rdf4j.query.Dataset dataset, org.eclipse.rdf4j.query.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

Constructor Detail

CompareOptimizer

public CompareOptimizer()

Method Detail

optimize

public void optimize(org.eclipse.rdf4j.query.algebra.TupleExpr tupleExpr,
                     org.eclipse.rdf4j.query.Dataset dataset,
                     org.eclipse.rdf4j.query.BindingSet bindings)

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

Specified by:

optimize in interface QueryOptimizer