net.sf.jguiraffe.di.impl

Class NullInvocation

java.lang.Object

net.sf.jguiraffe.di.impl.NullInvocation

All Implemented Interfaces:

Invokable

Deprecated.

Use HelperInvocations instead; it provides some dummy implementations of the Invokable interface which are useful in some situations where a full-blown implementation is not required.

@Deprecated
public final class NullInvocation
extends Object
implements Invokable

A dummy implementation of the Invokable interface that does not perform any action when it is invoked.

This class (or the default instance provided through the INSTANCE constant) can be used as a default place holder for an Invokable object. All methods are dummy implementations that have no side effect. So instead of checking for a null Invokable reference, this dummy invocation can be used.

Version:

$Id: NullInvocation.java 208 2012-02-11 20:57:33Z oheger $

Author:

Oliver Heger

Field Summary

Fields

Modifier and Type	Field and Description
static NullInvocation	INSTANCE Deprecated. The default instance of this class.

Constructor Summary

Constructors

Constructor and Description
NullInvocation() Deprecated.

Method Summary

Modifier and Type	Method and Description
List<Dependency>	getParameterDependencies() Deprecated. Returns the dependencies of this Invokable.
Object	invoke(DependencyProvider depProvider, Object target) Deprecated. Invokes this Invokable.
String	toString() Deprecated. Returns a string representation of this object.

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final NullInvocation INSTANCE

Deprecated.

The default instance of this class.

Constructor Detail

NullInvocation

public NullInvocation()

Deprecated.

Method Detail

getParameterDependencies

public List<Dependency> getParameterDependencies()

Deprecated.

Returns the dependencies of this Invokable. This is always an empty list.

Specified by:

getParameterDependencies in interface Invokable

Returns:

the dependencies of this object

invoke

public Object invoke(DependencyProvider depProvider,
                     Object target)

Deprecated.

Invokes this Invokable. This is just an empty dummy.

Specified by:

invoke in interface Invokable

Parameters:

depProvider - the dependency provider

target - the target object

Returns:

the result of the invocation, which is always null in this case

toString

public String toString()

Deprecated.

Returns a string representation of this object. This implementation just returns the text <no initializer>.

Overrides:

toString in class Object

Returns:

a string for this object