org.apache.lucene.util
Class MapBackedSet<E>

java.lang.Object
  java.util.AbstractCollection<E>
      java.util.AbstractSet<E>
          org.apache.lucene.util.MapBackedSet<E>

All Implemented Interfaces:

Serializable, Iterable<E>, Collection<E>, Set<E>

public final class MapBackedSet<E>
extends AbstractSet<E>
implements Serializable

A Set implementation that wraps an actual Map based implementation.

See Also:

Serialized Form

NOTE: This API is for internal purposes only and might change in incompatible ways in the next release.

This class is only provided with Lucene, as Java 5 does not yet support <E> Set<E> Collections.newSetFromMap(Map<E,Boolean>). It will be removed in Lucene 4.

Constructor Summary

MapBackedSet(Map<E,Boolean> map)
Creates a new instance which wraps the specified map.

Method Summary

boolean	add(E o)
void	clear()
boolean	contains(Object o)
Iterator<E>	iterator()
boolean	remove(Object o)
int	size()

Methods inherited from class java.util.AbstractSet

equals, hashCode, removeAll

Methods inherited from class java.util.AbstractCollection

addAll, containsAll, isEmpty, retainAll, toArray, toArray, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Set

addAll, containsAll, isEmpty, retainAll, toArray, toArray

Constructor Detail

MapBackedSet

public MapBackedSet(Map<E,Boolean> map)

Creates a new instance which wraps the specified map.

Method Detail

size

public int size()

Specified by:

size in interface Collection<E>

Specified by:

size in interface Set<E>

Specified by:

size in class AbstractCollection<E>

contains

public boolean contains(Object o)

Specified by:

contains in interface Collection<E>

Specified by:

contains in interface Set<E>

Overrides:

contains in class AbstractCollection<E>

add

public boolean add(E o)

Specified by:

add in interface Collection<E>

Specified by:

add in interface Set<E>

Overrides:

add in class AbstractCollection<E>

remove

public boolean remove(Object o)

Specified by:

remove in interface Collection<E>

Specified by:

remove in interface Set<E>

Overrides:

remove in class AbstractCollection<E>

clear

public void clear()

Specified by:

clear in interface Collection<E>

Specified by:

clear in interface Set<E>

Overrides:

clear in class AbstractCollection<E>

iterator

public Iterator<E> iterator()

Specified by:

iterator in interface Iterable<E>

Specified by:

iterator in interface Collection<E>

Specified by:

iterator in interface Set<E>

Specified by:

iterator in class AbstractCollection<E>