com.ibm.commons.iloader.node.collections
Class EmptyCollection

java.lang.Object
  com.ibm.commons.iloader.node.collections.EmptyCollection

All Implemented Interfaces:

IObjectCollection

public class EmptyCollection
extends java.lang.Object
implements IObjectCollection

An empty collection. All of the methods in this class provide a default, skeleton implementation of the com.ibm.commons.iloader.node.IObjectCollection interface. As this class always provides a default implementation it can be accessed statically via com.ibm.commons.iloader.node.collections.EmptyCollection.getInstance().

Constructor Summary

EmptyCollection()
Creates a new instance of this class.

Method Summary

boolean	add(int index, java.lang.Object object, DataChangeNotifier dataChangeNotifier) Returns false.
java.lang.Object	get(int index) Returns null.
static EmptyCollection	getInstance() Returns an instance of this class.
java.lang.Object	getParentObject() Returns null.
boolean	remove(int index, DataChangeNotifier dataChangeNotifier) Returns false.
boolean	removeAll(DataChangeNotifier dataChangeNotifier) Returns false.
boolean	set(int index, java.lang.Object object, DataChangeNotifier dataChangeNotifier) Returns false.
int	size() Returns zero.

Methods inherited from class java.lang.Object

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

Constructor Detail

EmptyCollection

public EmptyCollection()

Creates a new instance of this class.

Method Detail

getInstance

public static EmptyCollection getInstance()

Returns an instance of this class.

Returns:

size

public int size()

Returns zero.

Specified by:

size in interface IObjectCollection

Returns:

get

public java.lang.Object get(int index)

Returns null.

Specified by:

get in interface IObjectCollection

Returns:

add

public boolean add(int index,
                   java.lang.Object object,
                   DataChangeNotifier dataChangeNotifier)

Returns false.

Specified by:

add in interface IObjectCollection

Parameters:

index - index at which the item should be inserted

object - the new child to insert

dataChangeNotifier - a listener that is to be notified of the change

Returns:

returns true if the operation succeeded.

set

public boolean set(int index,
                   java.lang.Object object,
                   DataChangeNotifier dataChangeNotifier)

Returns false.

Specified by:

set in interface IObjectCollection

Parameters:

index - index at which the item should be inserted

object - the new child to insert

dataChangeNotifier - a listener that is to be notified of the change

Returns:

returns true if the operation succeeded.

remove

public boolean remove(int index,
                      DataChangeNotifier dataChangeNotifier)

Returns false.

Specified by:

remove in interface IObjectCollection

Parameters:

index - the index of the child to remove

dataChangeNotifier - a listener that is to be notified of the change

Returns:

returns true if the operation succeeded.

removeAll

public boolean removeAll(DataChangeNotifier dataChangeNotifier)

Returns false.

Specified by:

removeAll in interface IObjectCollection

Parameters:

dataChangeNotifier - a listener that is to be notified of the change

Returns:

returns true if the operation succeeded.

getParentObject

public java.lang.Object getParentObject()

Returns null.

Specified by:

getParentObject in interface IObjectCollection

Returns:

the physical object that contains this collection