Module org.apache.jena.arq

Package org.apache.jena.sparql.engine

Class QueryEngineRegistry

java.lang.Object

org.apache.jena.sparql.engine.QueryEngineRegistry

public class QueryEngineRegistry
extends Object

Constructor Summary

Constructors

Constructor	Description
QueryEngineRegistry()

Method Summary

Modifier and Type	Method	Description
void	add(QueryEngineFactory f)	Add a QueryExecutionFactory
static void	addFactory(QueryEngineFactory f)	Add a QueryExecutionFactory to the default registry
static QueryEngineRegistry	chooseRegistry(Context context)	If there is a registry in the context then return it otherwise yield the global instance
boolean	contains(QueryEngineFactory f)	Check whether a query engine factory is already registered
static boolean	containsFactory(QueryEngineFactory f)	Check whether a query engine factory is already registered in the default registry
QueryEngineRegistry	copy()
static QueryEngineRegistry	copyFrom(Context context)	Create a copy of the registry from the context or return a new instance
List<QueryEngineFactory>	factories()	Allow careful manipulation of the factories list
QueryEngineFactory	find(Query query, DatasetGraph dataset)	Locate a suitable factory for this query and dataset
QueryEngineFactory	find(Query query, DatasetGraph dataset, Context context)	Locate a suitable factory for this query and dataset
QueryEngineFactory	find(Op op, DatasetGraph dataset, Context context)	Locate a suitable factory for this algebra expression and dataset
static QueryEngineFactory	findFactory(Query query, DatasetGraph dataset, Context context)	Locate a suitable factory for this query and dataset from the default registry
static QueryEngineFactory	findFactory(Op op, DatasetGraph dataset, Context context)	Locate a suitable factory for this algebra expression and dataset from the default registry
static QueryEngineRegistry	get()
static QueryEngineRegistry	get(Context context)	Get the query engine registry from the context or null if there is none.
void	remove(QueryEngineFactory f)	Remove a QueryExecutionFactory
static void	removeFactory(QueryEngineFactory f)	Remove a QueryExecutionFactory
static void	set(Context context, QueryEngineRegistry registry)

Methods inherited from class java.lang.Object

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

Constructor Details

QueryEngineRegistry

public QueryEngineRegistry()

Method Details

get

public static QueryEngineRegistry get()

chooseRegistry

public static QueryEngineRegistry chooseRegistry(Context context)

If there is a registry in the context then return it otherwise yield the global instance

get

public static QueryEngineRegistry get(Context context)

Get the query engine registry from the context or null if there is none. Returns null if the context is null.

set

public static void set(Context context,
 QueryEngineRegistry registry)

copy

public QueryEngineRegistry copy()

copyFrom

public static QueryEngineRegistry copyFrom(Context context)

Create a copy of the registry from the context or return a new instance

findFactory

public static QueryEngineFactory findFactory(Query query,
 DatasetGraph dataset,
 Context context)

Locate a suitable factory for this query and dataset from the default registry

Parameters:

query - Query

dataset - Dataset

Returns:

A QueryExecutionFactory or null if none accept the request

findFactory

public static QueryEngineFactory findFactory(Op op,
 DatasetGraph dataset,
 Context context)

Locate a suitable factory for this algebra expression and dataset from the default registry

Parameters:

op - Algebra expression

dataset - DatasetGraph

context -

Returns:

A QueryExecutionFactory or null if none accept the request

find

public QueryEngineFactory find(Query query,
 DatasetGraph dataset)

Locate a suitable factory for this query and dataset

Parameters:

query - Query

dataset - Dataset

Returns:

A QueryExecutionFactory or null if none accept the request

find

public QueryEngineFactory find(Query query,
 DatasetGraph dataset,
 Context context)

Locate a suitable factory for this query and dataset

Parameters:

query - Query

dataset - Dataset

Returns:

A QueryExecutionFactory or null if none accept the request

find

public QueryEngineFactory find(Op op,
 DatasetGraph dataset,
 Context context)

Locate a suitable factory for this algebra expression and dataset

Parameters:

op - Algebra expression

dataset - DatasetGraph

context -

Returns:

A QueryExecutionFactory or null if none accept the request

addFactory

public static void addFactory(QueryEngineFactory f)

Add a QueryExecutionFactory to the default registry

add

public void add(QueryEngineFactory f)

Add a QueryExecutionFactory

removeFactory

public static void removeFactory(QueryEngineFactory f)

Remove a QueryExecutionFactory

remove

public void remove(QueryEngineFactory f)

Remove a QueryExecutionFactory

factories

public List<QueryEngineFactory> factories()

Allow careful manipulation of the factories list

containsFactory

public static boolean containsFactory(QueryEngineFactory f)

Check whether a query engine factory is already registered in the default registry

contains

public boolean contains(QueryEngineFactory f)

Check whether a query engine factory is already registered