Package org.eclipse.viatra.query.runtime.registry

## Interface IRegistryView

- All Superinterfaces:
    `IQuerySpecificationRegistryChangeListener`
  All Known Subinterfaces:
    `IDefaultRegistryView`
  All Known Implementing Classes:
    `AbstractRegistryView`

      public interface IRegistryView
      extends IQuerySpecificationRegistryChangeListener

  The registry view is the primary interface for users to interact with the query specifications in an `IQuerySpecificationRegistry`. Views are created using the createView methods of registry and their content is also dynamically updated by the registry. The view contains a set of `IQuerySpecificationRegistryEntry` objects that can be used to access the query specifications themselves through the get() method. Users can check the contents of the view and add listeners to get notifications on view changes (added or removed entries).
  Since:
    1.3

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `void` | `addViewListener​(IQuerySpecificationRegistryChangeListener listener)` | Adds a listener to the view that will be notified when an entry is added to or removed from the view.
    `java.lang.Iterable<IQuerySpecificationRegistryEntry>` | `getEntries()` |
    `java.util.Set<IQuerySpecificationRegistryEntry>` | `getEntries​(java.lang.String fullyQualifiedName)` |
    `java.util.Set<java.lang.String>` | `getQuerySpecificationFQNs()` |
    `IQuerySpecificationRegistry` | `getRegistry()` |
    `boolean` | `hasQuerySpecificationFQN​(java.lang.String fullyQualifiedName)` |
    `void` | `removeViewListener​(IQuerySpecificationRegistryChangeListener listener)` | Removes a listener that was previously added to the view.

    - ### Methods inherited from interface org.eclipse.viatra.query.runtime.registry.IQuerySpecificationRegistryChangeListener

      `entryAdded, entryRemoved`

- - ### Method Detail

    - #### getEntries

          java.lang.Iterable<IQuerySpecificationRegistryEntry> getEntries()

      Returns:
        an immutable copy of all entries found in the view

    - #### getQuerySpecificationFQNs

          java.util.Set<java.lang.String> getQuerySpecificationFQNs()

      Returns:
        the set of FQNs for the query specifications in the view

    - #### hasQuerySpecificationFQN

          boolean hasQuerySpecificationFQN​(java.lang.String fullyQualifiedName)

      Parameters:
        `fullyQualifiedName` - that is looked up in the view
      Returns:
        true if the view contains an entry with given FQN, false otherwise

    - #### getEntries

          java.util.Set<IQuerySpecificationRegistryEntry> getEntries​(java.lang.String fullyQualifiedName)

      Parameters:
        `fullyQualifiedName` - of the entries that are requested
      Returns:
        the possible empty set of entries with the given FQN

    - #### addViewListener

          void addViewListener​(IQuerySpecificationRegistryChangeListener listener)

      Adds a listener to the view that will be notified when an entry is added to or removed from the view.
      Parameters:
        `listener` - that is added

    - #### removeViewListener

          void removeViewListener​(IQuerySpecificationRegistryChangeListener listener)

      Removes a listener that was previously added to the view.
      Parameters:
        `listener` - that is removed

    - #### getRegistry

          IQuerySpecificationRegistry getRegistry()

      Returns:
        the registry underlying the view