org.eclipse.rdf4j.query.algebra.evaluation.util

Class EvaluationStrategies

java.lang.Object

org.eclipse.rdf4j.query.algebra.evaluation.util.EvaluationStrategies

public class EvaluationStrategies
extends Object

Registry for currently active EvaluationStrategy objects. The internal registry uses soft references to allow entries to be garbage-collected when no longer used. Currently, the primary purpose of this is to support (de)serialization of objects (over the lifetime of the VM) that depend on an EvaluationStrategy

Author:

Jeen Broekstra

Method Summary

Modifier and Type	Method and Description
static EvaluationStrategy	get(UUID key) Retrieve the EvaluationStrategy registered with the supplied key.
static UUID	getKey(EvaluationStrategy strategy) Retrieve the registry key for the given EvaluationStrategy
static UUID	register(EvaluationStrategy strategy) Add a strategy to the registry and returns the registry key.

Methods inherited from class java.lang.Object

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

Method Detail

get

public static final EvaluationStrategy get(UUID key)

Retrieve the EvaluationStrategy registered with the supplied key.

Parameters:

key - the key

Returns:

the registered EvaluationStrategy, or null if no matching EvaluationStrategy can be found.

getKey

public static final UUID getKey(EvaluationStrategy strategy)

Retrieve the registry key for the given EvaluationStrategy

Parameters:

strategy - the EvaluationStrategy for which to retrieve the registry key

Returns:

the registry key with which the supplied strategy can be retrieved, or null if the supplied strategy is not in the registry.

register

public static final UUID register(EvaluationStrategy strategy)

Add a strategy to the registry and returns the registry key. If the strategy is already present, the operation simply returns the key with which it is currently registered.

Parameters:

strategy - the EvaluationStrategy to register

Returns:

the key with which the strategy is registered.