org.jboss.util.collection
Class ListSet

java.lang.Object
  java.util.AbstractCollection<E>
      java.util.AbstractSet
          org.jboss.util.collection.ListSet

All Implemented Interfaces:

Serializable, Cloneable, Iterable, Collection, Set

public class ListSet
extends AbstractSet
implements Set, Cloneable, Serializable

A thin wrapper around a List transforming it into a modifiable Set.

Version:

$Revision: 1.5.6.2 $

Author:

Jason Dillon

See Also:

Serialized Form

Field Summary

protected List

list The List which will be used for element storage.

Constructor Summary

ListSet()
Construct a ListSet using an ArrayList for backing.

ListSet(Collection elements)
Construct a ListSet using an ArrayList for backing and populated with the given elements.

ListSet(List list)
Construct a ListSet.

Method Summary

boolean	add(Object obj) Add an element to the set.
void	clear() Removes all of the elements from this set.
Object	clone() Returns a shallow copy of this ListSet instance.
boolean	contains(Object obj) Returns true if this set contains the specified element.
List	getList()
boolean	isEmpty() Returns true if this set contains no elements.
Iterator	iterator() Return an iteration over the elements in the set.
boolean	remove(Object obj) Removes the given element from this set if it is present.
int	size() Return the size of the set.

Methods inherited from class java.util.AbstractSet

equals, hashCode, removeAll

Methods inherited from class java.util.AbstractCollection

addAll, containsAll, retainAll, toArray, toArray, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Set

addAll, containsAll, equals, hashCode, removeAll, retainAll, toArray, toArray

Field Detail

list

protected final List list

The List which will be used for element storage.

Constructor Detail

ListSet

public ListSet(List list)

Construct a ListSet.

Parameters:

list - The List which will be used for element storage.

Throws:

IllegalArgumentException - List is null or contains duplicate entries.

ListSet

public ListSet()

Construct a ListSet using an ArrayList for backing.

ListSet

public ListSet(Collection elements)

Construct a ListSet using an ArrayList for backing and populated with the given elements.

Parameters:

elements - The elements for the list.

Method Detail

getList

public List getList()

size

public int size()

Return the size of the set.

Specified by:

size in interface Collection

Specified by:

size in interface Set

Specified by:

size in class AbstractCollection

Returns:

The size of the set.

iterator

public Iterator iterator()

Return an iteration over the elements in the set.

Specified by:

iterator in interface Iterable

Specified by:

iterator in interface Collection

Specified by:

iterator in interface Set

Specified by:

iterator in class AbstractCollection

Returns:

An iteration over the elements in the set.

add

public boolean add(Object obj)

Add an element to the set.

Specified by:

add in interface Collection

Specified by:

add in interface Set

Overrides:

add in class AbstractCollection

Parameters:

obj - Element to add to the set.

Returns:

True if the element was added.

isEmpty

public boolean isEmpty()

Returns true if this set contains no elements.

Specified by:

isEmpty in interface Collection

Specified by:

isEmpty in interface Set

Overrides:

isEmpty in class AbstractCollection

Returns:

true if this set contains no elements.

contains

public boolean contains(Object obj)

Returns true if this set contains the specified element.

Specified by:

contains in interface Collection

Specified by:

contains in interface Set

Overrides:

contains in class AbstractCollection

Parameters:

obj - Element whose presence in this set is to be tested.

Returns:

true if this set contains the specified element.

remove

public boolean remove(Object obj)

Removes the given element from this set if it is present.

Specified by:

remove in interface Collection

Specified by:

remove in interface Set

Overrides:

remove in class AbstractCollection

Parameters:

obj - Object to be removed from this set, if present.

Returns:

true if the set contained the specified element.

clear

public void clear()

Removes all of the elements from this set.

Specified by:

clear in interface Collection

Specified by:

clear in interface Set

Overrides:

clear in class AbstractCollection

clone

public Object clone()

Returns a shallow copy of this ListSet instance.

Overrides:

clone in class Object

Returns:

A shallow copy of this set.