org.apache.catalina.util
Class Enumerator

java.lang.Object
  |
  +--org.apache.catalina.util.Enumerator

All Implemented Interfaces:

java.util.Enumeration

public final class Enumerator

extends java.lang.Object

implements java.util.Enumeration

Adapter class that wraps an Enumeration around a Java2 collection classes object Iterator so that existing APIs returning Enumerations can easily run on top of the new collections. Constructors are provided to easliy create such wrappers.

Version:

$Revision: 1.2 $ $Date: 2001/07/22 20:25:13 $

Author:

Craig R. McClanahan

Constructor Summary

Enumerator(java.util.Collection collection)
Return an Enumeration over the values of the specified Collection.

Enumerator(java.util.Iterator iterator)
Return an Enumeration over the values returned by the specified Iterator.

Enumerator(java.util.Map map)
Return an Enumeration over the values of the specified Map.

Method Summary

boolean	hasMoreElements() Tests if this enumeration contains more elements.
java.lang.Object	nextElement() Returns the next element of this enumeration if this enumeration has at least one more element to provide.

Methods inherited from class java.lang.Object

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

Constructor Detail

Enumerator

public Enumerator(java.util.Collection collection)

Return an Enumeration over the values of the specified Collection.

Parameters:

collection - Collection whose values should be enumerated

Enumerator

public Enumerator(java.util.Iterator iterator)

Return an Enumeration over the values returned by the specified Iterator.

Parameters:

iterator - Iterator to be wrapped

Enumerator

public Enumerator(java.util.Map map)

Return an Enumeration over the values of the specified Map.

Parameters:

map - Map whose values should be enumerated

Method Detail

hasMoreElements

public boolean hasMoreElements()

Tests if this enumeration contains more elements.

Specified by:

hasMoreElements in interface java.util.Enumeration

Returns:

true if and only if this enumeration object contains at least one more element to provide, false otherwise

nextElement

public java.lang.Object nextElement()
                             throws java.util.NoSuchElementException

Returns the next element of this enumeration if this enumeration has at least one more element to provide.

Specified by:

nextElement in interface java.util.Enumeration

Returns:

the next element of this enumeration

Throws:

java.util.NoSuchElementException - if no more elements exist