org.apache.commons.cache.adt
Class ListableBase

java.lang.Object
  org.apache.commons.cache.adt.ListableBase

All Implemented Interfaces:

Cloneable, Listable

Direct Known Subclasses:

ListableObject, WListableBase

public class ListableBase
extends Object
implements Listable, Cloneable

An base implementation of Listable, supporting singly-linked lists.

Version:

$Id: ListableBase.java 155435 2005-02-26 13:17:27Z dirkv $

Author:

Rodney Waldhoff

Field Summary

protected Listable

_next My following sibling.

Constructor Summary

ListableBase()
No arg constructor.

ListableBase(Listable next)
Constructor.

Method Summary

Listable	getNext() Return the Listable element following me, or null if I am the last element in the list.
Listable	getPrev() Throws UnsupportedOperationException.
boolean	hasNext() Return true if there is a Listable element following me, false otherwise.
boolean	hasPrev() Throws UnsupportedOperationException.
void	setNext(Listable next) Change my next element to next.
void	setPrev(Listable prev) Throws UnsupportedOperationException.

Methods inherited from class java.lang.Object

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

Field Detail

_next

protected transient Listable _next

My following sibling.

Constructor Detail

ListableBase

public ListableBase()

No arg constructor. Equivalent to ListableBase(null).

ListableBase

public ListableBase(Listable next)

Constructor.

Parameters:

next - the next element in the list.

Method Detail

getNext

public Listable getNext()

Description copied from interface: Listable

Return the Listable element following me, or null if I am the last element in the list.

Specified by:

getNext in interface Listable

Returns:

the Listable element following me, or null.

hasNext

public boolean hasNext()

Description copied from interface: Listable

Return true if there is a Listable element following me, false otherwise.

Specified by:

hasNext in interface Listable

Returns:

true if there is a Listable element following me, false otherwise.

setNext

public void setNext(Listable next)

Description copied from interface: Listable

Change my next element to next. Note that this does not change the Listable.getPrev() value of next.

Specified by:

setNext in interface Listable

Parameters:

next - my new following sibling.

getPrev

public Listable getPrev()
                 throws UnsupportedOperationException

Throws UnsupportedOperationException.

Specified by:

getPrev in interface Listable

Returns:

the Listable element preceeding me, or null.

Throws:

UnsupportedOperationException - if I am a singly-linked list.

hasPrev

public boolean hasPrev()
                throws UnsupportedOperationException

Throws UnsupportedOperationException.

Specified by:

hasPrev in interface Listable

Returns:

true if there is a Listable element preceeding me, false otherwise.

Throws:

UnsupportedOperationException - if I am a singly-linked list.

setPrev

public void setPrev(Listable prev)
             throws UnsupportedOperationException

Throws UnsupportedOperationException.

Specified by:

setPrev in interface Listable

Parameters:

prev - my new preceeding sibling.

Throws:

UnsupportedOperationException - if I am a singly-linked or read-only list.