com.artima.lookup.util
Class ConsistentSet

java.lang.Object
  |
  +--java.util.AbstractCollection
        |
        +--java.util.AbstractSet
              |
              +--com.artima.lookup.util.ConsistentSet

All Implemented Interfaces:

java.util.Collection, java.io.Serializable, java.util.Set

public class ConsistentSet

extends java.util.AbstractSet

implements java.io.Serializable

An implementation of the java.util.Set interface that has a serialized form consistent in all virtual machines. ConsistentSet instances are unmodifiable. All mutator methods, such as add and remove, throw UnsupportedOperationException. This class permits the null element.

Although instances of this class are unmodifiable, they are not necessarily immutable. If a client retrieves a mutable object contained in a ConsistentSet and mutates that object, the client in effect mutates the state of the ConsistentSet. In this case, the serialized form of the ConsistentSet will also most likely have been mutated. A ConsistentSet that contains only immutable objects will maintain a consistent serialized form indefinitely. But a ConsistentSet that contains mutable objects will maintain a consistent serialized form only so long as the mutable objects are not mutated.

See Also:

Serialized Form

Constructor Summary

ConsistentSet()
Constructs a new, empty ConsistentSet.

ConsistentSet(java.util.Collection init)
Constructs a new ConsistentSet containing the elements in the passed collection.

Method Summary

java.util.Iterator	iterator() Returns an iterator over the elements in this set.
int	size() Returns the number of elements in this ConsistentSet (its cardinality).

Methods inherited from class java.util.AbstractSet

equals, hashCode, removeAll

Methods inherited from class java.util.AbstractCollection

add, addAll, clear, contains, containsAll, isEmpty, remove, 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

add, addAll, clear, contains, containsAll, isEmpty, remove, retainAll, toArray, toArray

Constructor Detail

ConsistentSet

public ConsistentSet()

Constructs a new, empty ConsistentSet. All instances of ConsistentSet are unmodifiable.

ConsistentSet

public ConsistentSet(java.util.Collection init)

Constructs a new ConsistentSet containing the elements in the passed collection. All instances of ConsistentSet are unmodifiable.

Parameters:

init - the collection whose elements are to be placed into this set.

Method Detail

iterator

public java.util.Iterator iterator()

Returns an iterator over the elements in this set. The elements are returned in no particular order. Because all instances of ConsistentSet are unmodifiable, the remove method of the returned Iterator throws UnsupportedOperationException.

Overrides:

iterator in class java.util.AbstractCollection

Returns:

an Iterator over the elements in this ConsistentSet.

size

public int size()

Returns the number of elements in this ConsistentSet (its cardinality).

Overrides:

size in class java.util.AbstractCollection

Returns:

the number of elements in this ConsistentSet (its cardinality).