Module org.apache.jena.arq

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

Class ReorderLib

java.lang.Object

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

public class ReorderLib
extends Object

Constructor Summary

Constructors

Constructor	Description
ReorderLib()

Method Summary

Modifier and Type	Method	Description
static ReorderTransformation	fixed()	Return a ReorderTransformation that performs some basic reordering based on most grounded triples first, but otherwise leaves things in query-written order.
static ReorderTransformation	identity()	Return a ReorderTransformation that maps directly to the original (leaving the query writer in-control)
static ReorderProc	identityProc()	Return a ReorderProc that does no reordering (leaving the query writer in-control)
static ReorderTransformation	weighted(String filename)	Return a ReorderTransformation that uses statistics.

Methods inherited from class java.lang.Object

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

Constructor Details

ReorderLib

public ReorderLib()

Method Details

identityProc

public static ReorderProc identityProc()

Return a ReorderProc that does no reordering (leaving the query writer in-control)

identity

public static ReorderTransformation identity()

Return a ReorderTransformation that maps directly to the original (leaving the query writer in-control)

fixed

public static ReorderTransformation fixed()

Return a ReorderTransformation that performs some basic reordering based on most grounded triples first, but otherwise leaves things in query-written order.

weighted

public static ReorderTransformation weighted(String filename)

Return a ReorderTransformation that uses statistics. As used in TDB.