org.springframework.aop.target

Class EmptyTargetSource

java.lang.Object

org.springframework.aop.target.EmptyTargetSource

All Implemented Interfaces:

java.io.Serializable, TargetClassAware, TargetSource

public class EmptyTargetSource
extends java.lang.Object
implements TargetSource, java.io.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.
private boolean	isStatic
private static long	serialVersionUID use serialVersionUID from Spring 1.2 for interoperability
private java.lang.Class<?>	targetClass

Constructor Summary

Constructors

Modifier	Constructor and Description
private	EmptyTargetSource(java.lang.Class<?> targetClass, boolean isStatic) Create a new instance of the EmptyTargetSource class.

Method Summary

Modifier and Type	Method and Description
boolean	equals(java.lang.Object other)
static EmptyTargetSource	forClass(java.lang.Class<?> targetClass) Return an EmptyTargetSource for the given target Class.
static EmptyTargetSource	forClass(java.lang.Class<?> targetClass, boolean isStatic) Return an EmptyTargetSource for the given target Class.
java.lang.Object	getTarget() Always returns null.
java.lang.Class<?>	getTargetClass() Always returns the specified target Class, or null if none.
int	hashCode()
boolean	isStatic() Always returns true.
private java.lang.Object	readResolve() Returns the canonical instance on deserialization in case of no target class, thus protecting the Singleton pattern.
void	releaseTarget(java.lang.Object target) Nothing to release.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

serialVersionUID

private static final long serialVersionUID

use serialVersionUID from Spring 1.2 for interoperability

See Also:

Constant Field Values

INSTANCE

public static final EmptyTargetSource INSTANCE

The canonical (Singleton) instance of this EmptyTargetSource.

targetClass

private final java.lang.Class<?> targetClass

isStatic

private final boolean isStatic

Constructor Detail

EmptyTargetSource

private EmptyTargetSource(java.lang.Class<?> targetClass,
                          boolean isStatic)

Create a new instance of the EmptyTargetSource class.

This constructor is private to enforce the Singleton pattern / factory method pattern.

Parameters:

targetClass - the target class to expose (may be null)

isStatic - whether the TargetSource is marked as static

Method Detail

forClass

public static EmptyTargetSource forClass(java.lang.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(java.lang.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 java.lang.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 java.lang.Object getTarget()

Always returns null.

Specified by:

getTarget in interface TargetSource

Returns:

the target object, which contains the joinpoint

releaseTarget

public void releaseTarget(java.lang.Object target)

Nothing to release.

Specified by:

releaseTarget in interface TargetSource

Parameters:

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

readResolve

private java.lang.Object readResolve()

Returns the canonical instance on deserialization in case of no target class, thus protecting the Singleton pattern.

equals

public boolean equals(java.lang.Object other)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object