EmptySet

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jtemporal.util
Class EmptySet

java.lang.Object
  java.util.AbstractCollection
      java.util.AbstractSet
          jtemporal.util.EmptySet

All Implemented Interfaces:: java.util.Collection, java.lang.Iterable, java.io.Serializable, java.util.Set

public class EmptySet
extends java.util.AbstractSet
implements java.io.Serializable

Immutable empty read-only set (singleton).
For methods description, see java.util.Set

Version:: $Id$

Field Summary

private static java.lang.Object[] emptyArray


private static java.lang.String IMMUTABLE_ERROR


private static EmptySet INSTANCE


private static long serialVersionUID


Constructor Summary

private EmptySet()


Method Summary

boolean add(java.lang.Object o)
          Adds the specified element to the set if it is not already present (optional operation).

boolean addAll(java.util.Collection parm1)
          Adds all of the elements of the given collection to this set (optional operation).

void clear()
          Removes all elements from this set (optional operation).

boolean contains(java.lang.Object o)
          Returns true if the set contains the specified element.

boolean containsAll(java.util.Collection parm1)
          Returns true if this set contains all elements in the specified collection.

static EmptySet getInstance()


boolean isEmpty()
          Returns true if the set contains no elements.

java.util.Iterator iterator()
          Returns an iterator over the set.

private java.lang.Object readResolve()
          Resolves instances being deserialized to the predefined constant.

boolean remove(java.lang.Object o)
          Removes the specified element from this set (optional operation).

int size()
          Returns the number of elements in the set.

java.lang.Object[] toArray()
          Returns an array containing the elements of this set.

Methods inherited from class java.util.AbstractSet

equals, hashCode, removeAll

Methods inherited from class java.util.AbstractCollection

retainAll, toArray, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Set

retainAll, toArray

Field Detail

INSTANCE

private static final EmptySet INSTANCE

serialVersionUID

private static final long serialVersionUID

See Also:: Constant Field Values

IMMUTABLE_ERROR

private static final java.lang.String IMMUTABLE_ERROR

See Also:: Constant Field Values

emptyArray

private static java.lang.Object[] emptyArray

Constructor Detail

EmptySet

private EmptySet()

Method Detail

getInstance

public static EmptySet getInstance()

readResolve

private java.lang.Object readResolve()
                              throws java.io.InvalidObjectException

Resolves instances being deserialized to the predefined constant.