Package nl.talsmasoftware.context.delegation

Class Wrapper<T>

java.lang.Object

nl.talsmasoftware.context.delegation.Wrapper<T>

Direct Known Subclasses:

DelegatingExecutorService, DelegatingFuture, WrapperWithContext

public abstract class Wrapper<T>
extends Object

Base wrapper class offering a non-null delegate method.

Author:

Sjoerd Talsma

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	Wrapper(T delegate)	Constructor providing a delegate wrapped object.

Method Summary

Modifier and Type	Method	Description
protected T	delegate()	Delegate method that can be overridden in case the delegate is not yet available at construction time or when there some strategy applicable that determines the delegate at runtime.
boolean	equals(Object other)
int	hashCode()
protected T	nonNullDelegate()	Acessor to provide a guaranteed non-null delegate instance for use within delegation method implementations.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

Wrapper

protected Wrapper(T delegate)

Constructor providing a delegate wrapped object.

Parameters:

delegate - The delegate object being wrapped. This may only be null if the delegate() method is overridden to provide an alternative non-null result.

Method Detail

delegate

protected T delegate()

Delegate method that can be overridden in case the delegate is not yet available at construction time or when there some strategy applicable that determines the delegate at runtime.

By default, the specified delegate value from the constructor is returned.

Returns:

The delegate for this wrapper.

nonNullDelegate

protected final T nonNullDelegate()

Acessor to provide a guaranteed non-null delegate instance for use within delegation method implementations.

Returns:

The delegate for this wrapper (guaranteed to be non-null).

Throws:

NullPointerException - with a specific message in case the delegate was null.

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object other)

Overrides:

equals in class Object

toString

public String toString()

Overrides:

toString in class Object

Returns:

The class name and the delegate string representation.