Package 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 Details

    • 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.