org.springframework.aop.target

## Class EmptyTargetSource

- java.lang.Object
- - org.springframework.aop.target.EmptyTargetSource

- All Implemented Interfaces:
    Serializable, TargetClassAware, TargetSource

      public class EmptyTargetSource
      extends Object
      implements TargetSource, Serializable

  Canonical `TargetSource` when there is no target (or just the target class known), and behavior is supplied by interfaces and advisors only.
  Author:
    Rod Johnson, Juergen Hoeller
  See Also:
    Serialized Form

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static EmptyTargetSource` | `INSTANCE` The canonical (Singleton) instance of this `EmptyTargetSource`.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `boolean` | `equals(Object other)`
    `static EmptyTargetSource` | `forClass(Class targetClass)` Return an EmptyTargetSource for the given target Class.
    `static EmptyTargetSource` | `forClass(Class targetClass, boolean isStatic)` Return an EmptyTargetSource for the given target Class.
    `Object` | `getTarget()` Always returns `null`.
    `Class<?>` | `getTargetClass()` Always returns the specified target Class, or `null` if none.
    `int` | `hashCode()`
    `boolean` | `isStatic()` Always returns `true`.
    `void` | `releaseTarget(Object target)` Nothing to release.
    `String` | `toString()`

    - ### Methods inherited from class java.lang.Object

      `clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

- - ### Field Detail

    - #### INSTANCE

          public static final EmptyTargetSource INSTANCE

      The canonical (Singleton) instance of this `EmptyTargetSource`.

  - ### Method Detail

    - #### forClass

          public static EmptyTargetSource forClass(Class targetClass)

      Return an EmptyTargetSource for the given target Class.
      Parameters:
        `targetClass` - the target Class (may be `null`)
      See Also:
        `getTargetClass()`

    - #### forClass

          public static EmptyTargetSource forClass(Class targetClass,
                                   boolean isStatic)

      Return an EmptyTargetSource for the given target Class.
      Parameters:
        `targetClass` - the target Class (may be `null`)
        `isStatic` - whether the TargetSource should be marked as static
      See Also:
        `getTargetClass()`

    - #### getTargetClass

          public Class<?> getTargetClass()

      Always returns the specified target Class, or `null` if none.
      Specified by:
        `getTargetClass` in interface `TargetClassAware`
      Specified by:
        `getTargetClass` in interface `TargetSource`
      Returns:
        the type of targets returned by this `TargetSource`

    - #### isStatic

          public boolean isStatic()

      Always returns `true`.
      Specified by:
        `isStatic` in interface `TargetSource`
      Returns:
        `true` if the target is immutable
      See Also:
        `TargetSource.getTarget()`

    - #### getTarget

          public Object getTarget()

      Always returns `null`.
      Specified by:
        `getTarget` in interface `TargetSource`
      Returns:
        the target object, which contains the joinpoint

    - #### releaseTarget

          public void releaseTarget(Object target)

      Nothing to release.
      Specified by:
        `releaseTarget` in interface `TargetSource`
      Parameters:
        `target` - object obtained from a call to `TargetSource.getTarget()`

    - #### equals

          public boolean equals(Object other)

      Overrides:
        `equals` in class `Object`

    - #### hashCode

          public int hashCode()

      Overrides:
        `hashCode` in class `Object`

    - #### toString

          public String toString()

      Overrides:
        `toString` in class `Object`