Module org.apache.jena.arq

Package org.apache.jena.sparql.algebra.optimize

Class Optimize

java.lang.Object

org.apache.jena.sparql.algebra.optimize.Optimize

public class Optimize
extends Object

Optimization of algebra expressions.

New optimization processes can be installed via a global change:

    Optimize.setFactory((cxt)->new MyOptimizer(cxt)) ;

or on a per-context basis:

    Optimize.RewriterFactory f = (cxt)->new MyOptimizer(cxt) ;
    context.set(ARQConstants.sysOptimizerFactory, f) ;

Field Summary

Fields

Modifier and Type	Field	Description
static RewriteFactory	minimalOptimizationFactory	Factory for the "minimal" optimizer.
static RewriteFactory	noOptimizationFactory	Factory for the "Do nothing" optimizer.
static RewriteFactory	stdOptimizationFactory	Factory for the standard optimization sequnece.

Constructor Summary

Constructors

Constructor	Description
Optimize()

Method Summary

Modifier and Type	Method	Description
static Op	apply(Transform transform, Op op)	Apply a Transform to an Op
static void	basicOptimizer()	Set the global optimizer factory to one that only does property functions and scoped variables.
static RewriteFactory	getFactory()	Get the global factory for making optimizers
static void	noOptimizer()	Set the global optimizer factory to one that does nothing.
static Op	optimize(Op op, ExecutionContext execCxt)
static Op	optimize(Op op, Context context)	Optimize based on all options
static void	setFactory(RewriteFactory aFactory)	Globally set the factory for making optimizers

Methods inherited from class java.lang.Object

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

Field Details

noOptimizationFactory

public static RewriteFactory noOptimizationFactory

Factory for the "Do nothing" optimizer.

minimalOptimizationFactory

public static RewriteFactory minimalOptimizationFactory

Factory for the "minimal" optimizer.

stdOptimizationFactory

public static RewriteFactory stdOptimizationFactory

Factory for the standard optimization sequnece.

Constructor Details

Optimize

public Optimize()

Method Details

optimize

public static Op optimize(Op op,
 ExecutionContext execCxt)

optimize

public static Op optimize(Op op,
 Context context)

Optimize based on all options

noOptimizer

public static void noOptimizer()

Set the global optimizer factory to one that does nothing. Applications probably want basicOptimizer()

basicOptimizer

public static void basicOptimizer()

Set the global optimizer factory to one that only does property functions and scoped variables.

See Also:

• minimalOptimizationFactory

setFactory

public static void setFactory(RewriteFactory aFactory)

Globally set the factory for making optimizers

getFactory

public static RewriteFactory getFactory()

Get the global factory for making optimizers

apply

public static Op apply(Transform transform,
 Op op)

Apply a Transform to an Op