org.springframework.aop.target
Class EmptyTargetSource

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

All Implemented Interfaces:

Serializable, TargetSource

public class EmptyTargetSource
extends Object
implements TargetSource, Serializable

Canonical TargetSource when there's no target, and behavior is supplied by interfaces and advisors.

Author:

Rod Johnson

See Also:

Serialized Form

Field Summary

static EmptyTargetSource

INSTANCE

Method Summary

Object	getTarget() Return a target instance.
Class	getTargetClass() Return the type of targets returned by this TargetSource.
boolean	isStatic() Will all calls to TargetSource.getTarget() return the same object?
void	releaseTarget(Object target) Release the given target object obtained from the TargetSource.getTarget() method.
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

INSTANCE

public static final EmptyTargetSource INSTANCE

Method Detail

getTargetClass

public Class getTargetClass()

Description copied from interface: TargetSource

Return the type of targets returned by this TargetSource.

Can return null, although certain usages of a TargetSource might just work with a predetermined target class.

Specified by:

getTargetClass in interface TargetSource

Returns:

the type of targets returned by this TargetSource

isStatic

public boolean isStatic()

Description copied from interface: TargetSource

Will all calls to TargetSource.getTarget() return the same object?

In that case, there will be no need to invoke TargetSource.releaseTarget(Object), and the AOP framework can cache the return value of TargetSource.getTarget().

Specified by:

isStatic in interface TargetSource

Returns:

true if the target is immutable

See Also:

TargetSource.getTarget()

getTarget

public Object getTarget()

Description copied from interface: TargetSource

Return a target instance. Invoked immediately before the AOP framework calls the "target" of an AOP method invocation.

Specified by:

getTarget in interface TargetSource

Returns:

the target object, which contains the joinpoint

releaseTarget

public void releaseTarget(Object target)

Description copied from interface: TargetSource

Release the given target object obtained from the TargetSource.getTarget() method.

Specified by:

releaseTarget in interface TargetSource

Parameters:

target - object obtained from a call to TargetSource.getTarget()

toString

public String toString()

Overrides:

toString in class Object