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## org.apache.commons.collections.iterators
Class EnumerationIterator

    java.lang.Object
      |
      +--org.apache.commons.collections.iterators.EnumerationIterator

All Implemented Interfaces:
  Iterator

public class EnumerationIterator
extends Object
implements Iterator

Adapter to make `Enumeration` instances appear to be `Iterator` instances.

Since:
  Commons Collections 1.0
Version:
  $Revision: 1.8 $ $Date: 2004/04/21 20:34:12 $
Author:
  James Strachan, Daniel Rall

Constructor Summary
`EnumerationIterator()` Constructs a new `EnumerationIterator` that will not function until `setEnumeration(Enumeration)` is called.
`EnumerationIterator(Enumeration enumeration)` Constructs a new `EnumerationIterator` that provides an iterator view of the given enumeration.
`EnumerationIterator(Enumeration enumeration, Collection collection)` Constructs a new `EnumerationIterator` that will remove elements from the specified collection.

Method Summary
`Enumeration` | `getEnumeration()` Returns the underlying enumeration.
`boolean` | `hasNext()` Returns true if the underlying enumeration has more elements.
`Object` | `next()` Returns the next object from the enumeration.
`void` | `remove()` Removes the last retrieved element if a collection is attached.
`void` | `setEnumeration(Enumeration enumeration)` Sets the underlying enumeration.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### EnumerationIterator

    public EnumerationIterator()

  Constructs a new `EnumerationIterator` that will not function until `setEnumeration(Enumeration)` is called.

### EnumerationIterator

    public EnumerationIterator(Enumeration enumeration)

  Constructs a new `EnumerationIterator` that provides an iterator view of the given enumeration.

Parameters:
  `enumeration` - the enumeration to use

### EnumerationIterator

    public EnumerationIterator(Enumeration enumeration,
                               Collection collection)

  Constructs a new `EnumerationIterator` that will remove elements from the specified collection.

Parameters:
  `enumeration` - the enumeration to use
  `collection` - the collection to remove elements form

Method Detail

### hasNext

    public boolean hasNext()

  Returns true if the underlying enumeration has more elements.

  Specified by:
    `hasNext` in interface `Iterator`
  Returns:
    true if the underlying enumeration has more elements
  Throws:
    `NullPointerException` - if the underlying enumeration is null

### next

    public Object next()

  Returns the next object from the enumeration.

  Specified by:
    `next` in interface `Iterator`
  Returns:
    the next object from the enumeration
  Throws:
    `NullPointerException` - if the enumeration is null

### remove

    public void remove()

  Removes the last retrieved element if a collection is attached.

  Functions if an associated `Collection` is known. If so, the first occurrence of the last returned object from this iterator will be removed from the collection.

  Specified by:
    `remove` in interface `Iterator`
  Throws:
    `IllegalStateException` - `next()` not called.
    `UnsupportedOperationException` - if no associated collection

### getEnumeration

    public Enumeration getEnumeration()

  Returns the underlying enumeration.

  Returns:
    the underlying enumeration

### setEnumeration

    public void setEnumeration(Enumeration enumeration)

  Sets the underlying enumeration.

  Parameters:
    `enumeration` - the new underlying enumeration

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