Package org.springframework.aop.target

Class EmptyTargetSource

java.lang.Object

org.springframework.aop.target.EmptyTargetSource

All Implemented Interfaces:

Serializable, TargetClassAware, TargetSource

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

Method Summary

Modifier and Type	Method	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 Details

INSTANCE

public static final EmptyTargetSource INSTANCE

The canonical (Singleton) instance of this EmptyTargetSource.

Method Details

forClass

public static EmptyTargetSource forClass(@Nullable
 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(@Nullable
 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

@Nullable
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

@Nullable
public Object getTarget()

Always returns null.

Specified by:

getTarget in interface TargetSource

Returns:

the target object which contains the joinpoint, or null if there is no actual target instance

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(@Nullable
 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