com.hp.hpl.jena.sparql.engine.optimizer.reorder
Class ReorderTransformationSubstitution

java.lang.Object
  com.hp.hpl.jena.sparql.engine.optimizer.reorder.ReorderTransformationSubstitution

All Implemented Interfaces:

ReorderTransformation

Direct Known Subclasses:

ReorderFixed, ReorderWeighted

public abstract class ReorderTransformationSubstitution
extends Object
implements ReorderTransformation

Machinary. This code implements the connectiveness assumed by execution based on substitution (index joins). i.e. if { ?x :p ?v . ?x :q ?w } then ?x is TERM at the second triple.

Field Summary

static org.slf4j.Logger

log

Constructor Summary

ReorderTransformationSubstitution()

Method Summary

BasicPattern	reorder(BasicPattern pattern) Return the reordered basic graph pattern.
ReorderProc	reorderIndexes(BasicPattern pattern) Return the reordering function based on a basic graph pattern.

Methods inherited from class java.lang.Object

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

Field Detail

log

public static final org.slf4j.Logger log

Constructor Detail

ReorderTransformationSubstitution

public ReorderTransformationSubstitution()

Method Detail

reorder

public BasicPattern reorder(BasicPattern pattern)

Description copied from interface: ReorderTransformation

Return the reordered basic graph pattern.

Specified by:

reorder in interface ReorderTransformation

reorderIndexes

public final ReorderProc reorderIndexes(BasicPattern pattern)

Description copied from interface: ReorderTransformation

Return the reordering function based on a basic graph pattern.

Specified by:

reorderIndexes in interface ReorderTransformation