com.claritysys.util

Class EmptyEnumeration

java.lang.Object

com.claritysys.util.EmptyEnumeration

All Implemented Interfaces:

java.util.Enumeration

public final class EmptyEnumeration
extends java.lang.Object
implements java.util.Enumeration

EmptyEnumeration provides a memory-efficient way for methods to return an Enumeration which has no elements. Since there are no instance variables used it is also multi-thread safe.

To acquire an instance, invoke instance.

Version:

$Revision: 2348 $

See Also:

Enumeration

Method Summary

Modifier and Type	Method and Description
boolean	hasMoreElements() Return false.
static java.util.Enumeration	instance() Return the instance.
java.lang.Object	nextElement() Throw an exception if called.

Methods inherited from class java.lang.Object

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

Method Detail

instance

public static java.util.Enumeration instance()

Return the instance.

Returns:

the single instance.

hasMoreElements

public boolean hasMoreElements()

Return false.

Specified by:

hasMoreElements in interface java.util.Enumeration

Returns:

false, no matter what.

nextElement

public java.lang.Object nextElement()

Throw an exception if called.

Specified by:

nextElement in interface java.util.Enumeration