com.compoze.collab.util
Class EmptyList

java.lang.Object
  com.compoze.collab.util.EmptyList

All Implemented Interfaces

Iterable, Collection, List

public class EmptyList
extends Object
implements List

An always-empty List. A Singleton. Use i() to retrieve the instance. All methods that would add objects to this list throw UnsupportedOperationException. Most methods that remove objects are supported, but indicate that nothing was removed.

Method Summary

void	add(int index, Object element)
boolean	add(Object o)
boolean	addAll(Collection c)
boolean	addAll(int index, Collection c)
void	clear()
boolean	contains(Object o)
boolean	containsAll(Collection c)
Object	get(int index)
static EmptyList	i() Get the instance.
int	indexOf(Object o)
boolean	isEmpty()
Iterator	iterator()
int	lastIndexOf(Object o)
ListIterator	listIterator()
ListIterator	listIterator(int index)
Object	remove(int index)
boolean	remove(Object o)
boolean	removeAll(Collection c)
boolean	retainAll(Collection c)
Object	set(int index, Object element)
int	size()
List	subList(int fromIndex, int toIndex)
Object[]	toArray()
Object[]	toArray(Object[] a)

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.List

equals, hashCode

Method Detail

i

public static EmptyList i()

Get the instance.

Returns

the EmptyList instance

size

public int size()

Specified by:

size in interface Collection

Specified by:

size in interface List

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Collection

Specified by:

isEmpty in interface List

contains

public boolean contains(Object o)

Specified by:

contains in interface Collection

Specified by:

contains in interface List

iterator

public Iterator iterator()

Specified by:

iterator in interface Iterable

Specified by:

iterator in interface Collection

Specified by:

iterator in interface List

toArray

public Object[] toArray()

Specified by:

toArray in interface Collection

Specified by:

toArray in interface List

toArray

public Object[] toArray(Object[] a)

Specified by:

toArray in interface Collection

Specified by:

toArray in interface List

add

public boolean add(Object o)

Specified by:

add in interface Collection

Specified by:

add in interface List

remove

public boolean remove(Object o)

Specified by:

remove in interface Collection

Specified by:

remove in interface List

containsAll

public boolean containsAll(Collection c)

Specified by:

containsAll in interface Collection

Specified by:

containsAll in interface List

addAll

public boolean addAll(Collection c)

Specified by:

addAll in interface Collection

Specified by:

addAll in interface List

addAll

public boolean addAll(int index,
                      Collection c)

Specified by:

addAll in interface List

removeAll

public boolean removeAll(Collection c)

Specified by:

removeAll in interface Collection

Specified by:

removeAll in interface List

retainAll

public boolean retainAll(Collection c)

Specified by:

retainAll in interface Collection

Specified by:

retainAll in interface List

clear

public void clear()

Specified by:

clear in interface Collection

Specified by:

clear in interface List

get

public Object get(int index)

Specified by:

get in interface List

set

public Object set(int index,
                  Object element)

Specified by:

set in interface List

add

public void add(int index,
                Object element)

Specified by:

add in interface List

remove

public Object remove(int index)

Specified by:

remove in interface List

indexOf

public int indexOf(Object o)

Specified by:

indexOf in interface List

lastIndexOf

public int lastIndexOf(Object o)

Specified by:

lastIndexOf in interface List

listIterator

public ListIterator listIterator()

Specified by:

listIterator in interface List

listIterator

public ListIterator listIterator(int index)

Specified by:

listIterator in interface List

subList

public List subList(int fromIndex,
                    int toIndex)

Specified by:

subList in interface List