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

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

All Implemented Interfaces:

Transform

public class TransformFilterPlacement
extends TransformCopy

Rewrite an algebra expression to put filters as close to their bound variables.

Process BGP (whether triples or quads) is left as a separate step (but after this transform) because it can desirable to reorder the BGP before placing filters, or afterwards.

Field Summary

Fields inherited from class com.hp.hpl.jena.sparql.algebra.TransformCopy

COPY_ALWAYS, COPY_ONLY_ON_CHANGE

Constructor Summary

TransformFilterPlacement()

TransformFilterPlacement(boolean includeBGPs)

Method Summary

static com.hp.hpl.jena.sparql.algebra.optimize.TransformFilterPlacement.Placement	debugPlaceBGP(ExprList exprsIn, BasicPattern pattern)
static Op	transform(ExprList exprs, BasicPattern bgp) Apply filter placement to a BGP
static Op	transform(ExprList exprs, Node graphNode, BasicPattern bgp) Apply filter placement to a named graph BGP
Op	transform(OpFilter opFilter, Op x)

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, transform

Methods inherited from class java.lang.Object

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

Constructor Detail

TransformFilterPlacement

public TransformFilterPlacement()

TransformFilterPlacement

public TransformFilterPlacement(boolean includeBGPs)

Method Detail

transform

public static Op transform(ExprList exprs,
                           BasicPattern bgp)

Apply filter placement to a BGP

transform

public static Op transform(ExprList exprs,
                           Node graphNode,
                           BasicPattern bgp)

Apply filter placement to a named graph BGP

transform

public Op transform(OpFilter opFilter,
                    Op x)

Specified by:

transform in interface Transform

Overrides:

transform in class TransformCopy

debugPlaceBGP

public static com.hp.hpl.jena.sparql.algebra.optimize.TransformFilterPlacement.Placement debugPlaceBGP(ExprList exprsIn,
                                                                                                       BasicPattern pattern)