Module org.apache.jena.arq

Package org.apache.jena.sparql.engine.main

Class StageBuilder

java.lang.Object

org.apache.jena.sparql.engine.main.StageBuilder

public class StageBuilder
extends Object

The stage builder (there is only one) is a library that encapsulates evaluation of a basic graph pattern (BGP). Matching BGPs is an extension point of SPARQL; different entailment regimes plug in at this point. They are also an extension point in ARQ to connect to any datasource, the most common case being connecting to a Jena graph. The StageBuilder finds the registered StageGenerator, and calls it to evaluate a basic graph pattern that has any bound variables replaced by their value (in effect, an index join). Extension happens by registering a different StageGenerator in the context object for the execution. Setting the StageGenerator in the global context (ARQ) makes it available to all query execution created after the point of setting. Helper static methods for setting the stage generator are provided.

Field Summary

Fields

Modifier and Type	Field	Description
static StageGenerator	executeInline	The plain StageGenerator, no reordering

Constructor Summary

Constructors

Constructor	Description
StageBuilder()

Method Summary

Modifier and Type	Method	Description
static StageGenerator	chooseStageGenerator(Context context)
static StageGenerator	getGenerator()
static StageGenerator	getGenerator(Context context)
static void	setGenerator(Context context, StageGenerator stageGenerator)
static StageGenerator	standardGenerator()

Methods inherited from class java.lang.Object

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

Field Details

executeInline

public static StageGenerator executeInline

The plain StageGenerator, no reordering

Constructor Details

StageBuilder

public StageBuilder()

Method Details

setGenerator

public static void setGenerator(Context context,
 StageGenerator stageGenerator)

getGenerator

public static StageGenerator getGenerator(Context context)

getGenerator

public static StageGenerator getGenerator()

standardGenerator

public static StageGenerator standardGenerator()

chooseStageGenerator

public static StageGenerator chooseStageGenerator(Context context)