edu.tum.cs.commons.collections
Class UnmodifiableSet<E>

java.lang.Object
  edu.tum.cs.commons.collections.UnmodifiableCollection<E>
      edu.tum.cs.commons.collections.UnmodifiableSet<E>

All Implemented Interfaces:

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

Direct Known Subclasses:

UnmodifiableSortedSet

public class UnmodifiableSet<E>
extends UnmodifiableCollection<E>
implements Set<E>

This is a wrapper for a Set prohibiting all calls which would modify its contents. As the construction of this class is performed in constant time it is prefered over copying the set (which takes linear time). Using this class is also preferred to using the unmodifiableX() in class Collections as they return the collection base type that does not signal, that the object ist unmodifiable. Using the classes in this package makes unmodifiability more explicit.

All prohibited methods throw an UnsupportedOperationException. The class is nearly the same as the one returned by Collections.unmodifiableSet(java.util.Set), but by making it a public class we can make the return value of some methods more explicit.

Version:

$Revision: 26283 $

Author:

Benjamin Hummel, $Author: juergens $

See Also:

Serialized Form

Rating:

GREEN Hash: 1221FC9A0B5282EB5A1323A35B955157

Constructor Summary

UnmodifiableSet(Set<E> s)
Creates a new unmodifiable set from another set.

Method Summary

Methods inherited from class edu.tum.cs.commons.collections.UnmodifiableCollection

add, addAll, clear, contains, containsAll, isEmpty, iterator, remove, removeAll, retainAll, size, toArray, toArray, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Set

add, addAll, clear, contains, containsAll, equals, hashCode, isEmpty, iterator, remove, removeAll, retainAll, size, toArray, toArray

Constructor Detail

UnmodifiableSet

public UnmodifiableSet(Set<E> s)

Creates a new unmodifiable set from another set. All modifications to the underlying set will directly be visible in this wrapper.