Module org.apache.jena.arq

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 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 final org.slf4j.Logger	log

Constructor Summary

Constructors

Constructor	Description
ReorderTransformationSubstitution()

Method Summary

Modifier and Type	Method	Description
final BasicPattern	reorder(BasicPattern pattern)	Return the reordered basic graph pattern.
final 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 Details

log

public static final org.slf4j.Logger log

Constructor Details

ReorderTransformationSubstitution

public ReorderTransformationSubstitution()

Method Details

reorder

public final 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