EmptyTargetSource (Spring Framework API 2.1) - Spring Framework 2.1.0 API 文档英文版

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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
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

static EmptyTargetSource INSTANCE
          The canonical (Singleton) instance of this EmptyTargetSource.

Method Summary

boolean equals(Object other)


static EmptyTargetSource forClass(Class targetClass)
          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 Summary
`static EmptyTargetSource`	`INSTANCE` The canonical (Singleton) instance of this `EmptyTargetSource`.

Method Summary
`boolean`	`equals(Object other)`
`static EmptyTargetSource`	`forClass(Class targetClass)` 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()

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