Package tools.refinery.interpreter.matchers.backend

Interface IQueryBackendFactory

public interface IQueryBackendFactory
A Query Backend Factory identifies a query evaluator implementation, and can create an evaluator instance (an IQueryBackend) tied to a specific Refinery Interpreter engine upon request.

The factory is used as a lookup key for the backend instance, therefore implementors should either be singletons, or implement equals() / hashCode() accordingly.

  • Method Details

    • create

      IQueryBackend create(IQueryBackendContext context)
      Creates a new IQueryBackend instance tied to the given context elements.
      Returns:
      an instance of the class returned by getBackendClass() that operates in the given context.
      Since:
      1.5

    • getBackendClass

      Class<? extends IQueryBackend> getBackendClass()
      The backend instances created by this factory are guaranteed to conform to the returned class.

    • calculateRequiredCapability

      IMatcherCapability calculateRequiredCapability(PQuery query, QueryEvaluationHint hint)
      Calculate the required capabilities, which are needed to execute the given pattern
      Since:
      1.4

    • isCaching

      boolean isCaching()
      Returns whether the current backend is caching
      Since:
      2.0