org.apache.jena.sparql.algebra.optimize.TransformReorder

public class TransformReorder extends TransformCopy

A Transformer that applies a reordering to all BGPs and Quad Patterns present in the algebra

This transformer may be slightly naive in that it only leverages the ReorderTransformation.reorder(BasicPattern) method and does not use the ReorderTransformation.reorderIndexes(BasicPattern) method at all so may not achieve the best reordering

Field Summary

Fields inherited from class org.apache.jena.sparql.algebra.TransformCopy
COPY_ALWAYS, COPY_ONLY_ON_CHANGE
Constructor Summary

Constructors

Constructor

Description

TransformReorder()

Creates a Transformer that uses the fixed reordering provided by ReorderLib.fixed()

TransformReorder(ReorderTransformation reorder)

Creates a Transformer that uses the given reordering
Method Summary

Modifier and Type

Method

Description

Op

transform(OpBGP opBGP)

Transforms BGPs with the reordering

Op

transform(OpQuadPattern opQuadPattern)

Transforms Quad Patterns with the reordering

Methods inherited from class org.apache.jena.sparql.algebra.TransformCopy
transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform, transform

Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Class TransformReorder

Field Summary