Package org.apache.jena.sparql.engine.optimizer.reorder

Class ReorderTransformationSubstitution

java.lang.Object

org.apache.jena.sparql.engine.optimizer.reorder.ReorderTransformationSubstitution

All Implemented Interfaces:

ReorderTransformation

Direct Known Subclasses:

ReorderFixed, ReorderFixedAlt, ReorderWeighted

public abstract class ReorderTransformationSubstitution
extends java.lang.Object
implements ReorderTransformation

Machinery. 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

Fields

Modifier and Type	Field	Description
static org.slf4j.Logger	log

Constructor Summary

Constructors

Constructor	Description
ReorderTransformationSubstitution()

Method Summary

Modifier and Type	Method	Description
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