org.apache.catalina.util

Class Enumerator

public final class Enumerator extends Object implements 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: 467222 $ $Date: 2006-10-24 05:17:11 +0200 (Tue, 24 Oct 2006) $

Author: Craig R. McClanahan

Constructor Summary
Enumerator(Collection collection)
Return an Enumeration over the values of the specified Collection.
Enumerator(Collection collection, boolean clone)
Return an Enumeration over the values of the specified Collection.
Enumerator(Iterator iterator)
Return an Enumeration over the values returned by the specified Iterator.
Enumerator(Iterator iterator, boolean clone)
Return an Enumeration over the values returned by the specified Iterator.
Enumerator(Map map)
Return an Enumeration over the values of the specified Map.
Enumerator(Map map, boolean clone)
Return an Enumeration over the values of the specified Map.
Method Summary
booleanhasMoreElements()
Tests if this enumeration contains more elements.
ObjectnextElement()
Returns the next element of this enumeration if this enumeration has at least one more element to provide.

Constructor Detail

Enumerator

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

Parameters: collection Collection whose values should be enumerated

Enumerator

public Enumerator(Collection collection, boolean clone)
Return an Enumeration over the values of the specified Collection.

Parameters: collection Collection whose values should be enumerated clone true to clone iterator

Enumerator

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

Parameters: iterator Iterator to be wrapped

Enumerator

public Enumerator(Iterator iterator, boolean clone)
Return an Enumeration over the values returned by the specified Iterator.

Parameters: iterator Iterator to be wrapped clone true to clone iterator

Enumerator

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

Parameters: map Map whose values should be enumerated

Enumerator

public Enumerator(Map map, boolean clone)
Return an Enumeration over the values of the specified Map.

Parameters: map Map whose values should be enumerated clone true to clone iterator

Method Detail

hasMoreElements

public boolean hasMoreElements()
Tests if this enumeration contains more elements.

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

nextElement

public Object nextElement()
Returns the next element of this enumeration if this enumeration has at least one more element to provide.

Returns: the next element of this enumeration

Throws: NoSuchElementException if no more elements exist

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