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Java Source Code / Java Documentation » Library » Apache common Collections » org.apache.commons.collections.set

Source Cross Reference Class Diagram Java Document (Java Doc)

java.lang .Object

org.apache.commons.collections.set .MapBackedSet

MapBackedSet

final public class MapBackedSet implements Set,Serializable(Code)

Decorates a Map to obtain Set behaviour.

This class is used to create a Set with the same properties as the key set of any map. Thus, a ReferenceSet can be created by wrapping a ReferenceMap in an instance of this class.

Most map implementation can be used to create a set by passing in dummy values. Exceptions include BidiMap implementations, as they require unique values.
since:
   Commons Collections 3.1
version:
   $Revision: 357494 $ $Date: 2005-12-18 19:05:31 +0000 (Sun, 18 Dec 2005) $
author:
   Stephen Colebourne

Field Summary
final protected Object	dummyValue
final protected Map	map

Method Summary
public boolean	add(Object obj)
public boolean	addAll(Collection coll)
public void	clear()
public boolean	contains(Object obj)
public boolean	containsAll(Collection coll)
public static Set	decorate(Map map) Factory method to create a set from a map.
public static Set	decorate(Map map, Object dummyValue) Factory method to create a set from a map.
public boolean	equals(Object obj)
public int	hashCode()
public boolean	isEmpty()
public Iterator	iterator()
public boolean	remove(Object obj)
public boolean	removeAll(Collection coll)
public boolean	retainAll(Collection coll)
public int	size()
public Object[]	toArray()
public Object[]	toArray(Object[] array)

Field Detail

dummyValue
final protected Object dummyValue(Code)
	The dummyValue to use

map
final protected Map map(Code)
	The map being used as the backing store

Method Detail

add
public boolean add(Object obj)(Code)

addAll
public boolean addAll(Collection coll)(Code)

clear
public void clear()(Code)

contains
public boolean contains(Object obj)(Code)

containsAll
public boolean containsAll(Collection coll)(Code)

decorate
public static Set decorate(Map map)(Code)
	Factory method to create a set from a map. Parameters: map - the map to decorate, must not be null throws: IllegalArgumentException - if set is null

decorate
public static Set decorate(Map map, Object dummyValue)(Code)
	Factory method to create a set from a map. Parameters: map - the map to decorate, must not be null Parameters: dummyValue - the dummy value to use throws: IllegalArgumentException - if map is null

equals
public boolean equals(Object obj)(Code)

hashCode
public int hashCode()(Code)

isEmpty
public boolean isEmpty()(Code)

iterator
public Iterator iterator()(Code)

remove
public boolean remove(Object obj)(Code)

removeAll
public boolean removeAll(Collection coll)(Code)

retainAll
public boolean retainAll(Collection coll)(Code)

size
public int size()(Code)

toArray
public Object[] toArray()(Code)

toArray
public Object[] toArray(Object[] array)(Code)

Methods inherited from java.lang.Object

native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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