# Package org.eclipse.viatra.query.runtime.matchers.util

- Interface Summary
  Interface | Description
  --- | ---
  IProvider<T> | A provider interface useful in various registry instances.

- Class Summary
  Class | Description
  --- | ---
  CollectionsFactory |
  IProvider.ProvidedValueFunction |
  SingletonInstanceProvider<T> | A provider implementation that always returns the same object instance.

- Enum Summary
  Enum | Description
  --- | ---
  CollectionsFactory.CollectionsFramework |
  Direction |