# Interface PluginCollection<T extends Plugin>

Type Parameters:
  `T` - The type of plugins which this collection contains.

All Superinterfaces:
  `Collection<T>, DomainObjectCollection<T>, DomainObjectSet<T>, Iterable<T>, Set<T>`

All Known Subinterfaces:
  `PluginContainer`

public interface PluginCollection<T extends Plugin> extends DomainObjectSet<T>

A `PluginCollection` represents a collection of `Plugin` instances.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `boolean`
  `add(T plugin)`
  Deprecated.
  Use `PluginManager.apply(Class)` instead.
  `boolean`
  `addAll(Collection<? extends T> c)`
  Deprecated.
  Use `PluginManager.apply(Class)` instead.
  `void`
  `clear()`
  Deprecated.
  plugins cannot be removed.
  `PluginCollection<T>`
  `matching(Closure closure)`
  Returns a collection which contains the objects in this collection which meet the given closure specification.
  `PluginCollection<T>`
  `matching(Spec<? super T> spec)`
  Returns a collection which contains the objects in this collection which meet the given specification.
  `boolean`
  `remove(Object o)`
  Deprecated.
  plugins cannot be removed.
  `boolean`
  `removeAll(Collection<?> c)`
  Deprecated.
  plugins cannot be removed.
  `void`
  `whenPluginAdded(Closure closure)`
  Adds a closure to be called when a plugin is added to this collection.
  `Action<? super T>`
  `whenPluginAdded(Action<? super T> action)`
  Adds an `Action` to be executed when a plugin is added to this collection.
  `<S extends T>
  PluginCollection<S>`
  `withType(Class<S> type)`
  Returns a collection containing the objects in this collection of the given type.

  ### Methods inherited from interface Collection

  `parallelStream, removeIf, stream, toArray`

  ### Methods inherited from interface DomainObjectCollection

  `addAllLater, addLater, all, all, configureEach, disallowChanges, getElements, whenObjectAdded, whenObjectAdded, whenObjectRemoved, whenObjectRemoved, withType, withType`

  ### Methods inherited from interface DomainObjectSet

  `findAll`

  ### Methods inherited from interface Iterable

  `forEach`

  ### Methods inherited from interface Set

  `contains, containsAll, equals, hashCode, isEmpty, iterator, retainAll, size, spliterator, toArray, toArray`

- ## Method Details

  - ### matching

    PluginCollection<T> matching(Spec<? super T> spec)
    Returns a collection which contains the objects in this collection which meet the given specification. The returned collection is live, so that when matching objects are added to this collection, they are also visible in the filtered collection.

    This method is an intermediate eager operation. The application of the filter forces the realization of the collection elements.

    Specified by:
      `matching` in interface `DomainObjectCollection<T extends Plugin>`
    Specified by:
      `matching` in interface `DomainObjectSet<T extends Plugin>`
    Parameters:
      `spec` - The specification to use.
    Returns:
      The collection of matching objects. Returns an empty collection if there are no such objects in this collection.

  - ### matching

    PluginCollection<T> matching(Closure closure)
    Returns a collection which contains the objects in this collection which meet the given closure specification. The returned collection is live, so that when matching objects are added to this collection, they are also visible in the filtered collection.

    This method is an intermediate eager operation. The application of the filter forces the realization of the collection elements.

    Specified by:
      `matching` in interface `DomainObjectCollection<T extends Plugin>`
    Specified by:
      `matching` in interface `DomainObjectSet<T extends Plugin>`
    Parameters:
      `closure` - The specification to use. The closure gets a collection element as an argument.
    Returns:
      The collection of matching objects. Returns an empty collection if there are no such objects in this collection.

  - ### withType

    <S extends T> PluginCollection<S> withType(Class<S> type)
    Returns a collection containing the objects in this collection of the given type. The returned collection is live, so that when matching objects are later added to this collection, they are also visible in the filtered collection.

    This method is an intermediate operation. It does not change the realized/unrealized state of the elements in the collection.

    Specified by:
      `withType` in interface `DomainObjectCollection<T extends Plugin>`
    Specified by:
      `withType` in interface `DomainObjectSet<T extends Plugin>`
    Parameters:
      `type` - The type of objects to find.
    Returns:
      The matching objects. Returns an empty collection if there are no such objects in this collection.

  - ### whenPluginAdded

    Action<? super T> whenPluginAdded(Action<? super T> action)
    Adds an `Action` to be executed when a plugin is added to this collection.
    Parameters:
      `action` - The action to be executed
    Returns:
      the supplied action

  - ### whenPluginAdded

    void whenPluginAdded(Closure closure)
    Adds a closure to be called when a plugin is added to this collection. The plugin is passed to the closure as the parameter.
    Parameters:
      `closure` - The closure to be called

  - ### add

    @Deprecated boolean add(T plugin)
    Deprecated.
    Use `PluginManager.apply(Class)` instead.
    Unsupported.
    Specified by:
      `add` in interface `Collection<T extends Plugin>`
    Specified by:
      `add` in interface `Set<T extends Plugin>`

  - ### addAll

    @Deprecated boolean addAll(Collection<? extends T> c)
    Deprecated.
    Use `PluginManager.apply(Class)` instead.
    Unsupported.
    Specified by:
      `addAll` in interface `Collection<T extends Plugin>`
    Specified by:
      `addAll` in interface `Set<T extends Plugin>`

  - ### remove

    @Deprecated boolean remove(Object o)
    Deprecated.
    plugins cannot be removed.
    Unsupported.
    Specified by:
      `remove` in interface `Collection<T extends Plugin>`
    Specified by:
      `remove` in interface `Set<T extends Plugin>`

  - ### removeAll

    @Deprecated boolean removeAll(Collection<?> c)
    Deprecated.
    plugins cannot be removed.
    Unsupported.
    Specified by:
      `removeAll` in interface `Collection<T extends Plugin>`
    Specified by:
      `removeAll` in interface `Set<T extends Plugin>`

  - ### clear

    @Deprecated void clear()
    Deprecated.
    plugins cannot be removed.
    Unsupported.
    Specified by:
      `clear` in interface `Collection<T extends Plugin>`
    Specified by:
      `clear` in interface `Set<T extends Plugin>`