com.hp.hpl.jena.sparql.algebra.optimize
Class TransformReorder

java.lang.Object
  com.hp.hpl.jena.sparql.algebra.TransformCopy
      com.hp.hpl.jena.sparql.algebra.optimize.TransformReorder

All Implemented Interfaces:

Transform

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 com.hp.hpl.jena.sparql.algebra.TransformCopy

COPY_ALWAYS, COPY_ONLY_ON_CHANGE

Constructor Summary

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

Op	transform(OpBGP opBGP) Transforms BGPs with the reordering
Op	transform(OpQuadPattern opQuadPattern) Transforms Quad Patterns with the reordering

Methods inherited from class com.hp.hpl.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

Methods inherited from class java.lang.Object

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

Constructor Detail

TransformReorder

public TransformReorder()

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

TransformReorder

public TransformReorder(ReorderTransformation reorder)

Creates a Transformer that uses the given reordering

Method Detail

transform

public Op transform(OpBGP opBGP)

Transforms BGPs with the reordering

Specified by:

transform in interface Transform

Overrides:

transform in class TransformCopy

transform

public Op transform(OpQuadPattern opQuadPattern)

Transforms Quad Patterns with the reordering

Specified by:

transform in interface Transform

Overrides:

transform in class TransformCopy