org.eclipse.rdf4j.sail.federation.optimizers

Class QueryModelPruner

java.lang.Object

org.eclipse.rdf4j.sail.federation.optimizers.QueryModelPruner

All Implemented Interfaces:

QueryOptimizer

public class QueryModelPruner
extends Object
implements QueryOptimizer

A query optimizer that prunes query model trees by removing superfluous parts and/or by reducing complex parts with simpler parts.

Author:

Arjohn Kampman

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected class	QueryModelPruner.TreeSanitizer

Constructor Summary

Constructors

Constructor and Description
QueryModelPruner()

Method Summary

Modifier and Type	Method and Description
void	optimize(TupleExpr tupleExpr, Dataset dataset, BindingSet bindings) Applies generally applicable optimizations: path expressions are sorted from more to less specific.

Methods inherited from class java.lang.Object

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

Constructor Detail

QueryModelPruner

public QueryModelPruner()

Method Detail

optimize

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

Applies generally applicable optimizations: path expressions are sorted from more to less specific.

Specified by:

optimize in interface QueryOptimizer