/*

  * Copyright (C) 1998-2000 Semiotek Inc.  All Rights Reserved.

  *

  * Redistribution and use in source and binary forms, with or without

  * modification, are permitted under the terms of either of the following

  * Open Source licenses:

  *

  * The GNU General Public License, version 2, or any later version, as

  * published by the Free Software Foundation

  * (http://www.fsf.org/copyleft/gpl.html);

  *

  *  or

  *

  * The Semiotek Public License (http://webmacro.org/LICENSE.)

  *

  * This software is provided "as is", with NO WARRANTY, not even the

  * implied warranties of fitness to purpose, or merchantability. You

  * assume all risks and liabilities associated with its use.

  *

  * See www.webmacro.org for more information on the WebMacro project.

  */

 package org.webmacro.util;

 import java.util.Iterator;

 import java.util.NoSuchElementException;

 /**

  * An Iterator interface to an array.

  */

 final public class ArrayIterator implements Iterator

 {

     final Object[] a;

     int pos;

     /**

      * Construct an iterator given an enumeration.

      */

     public ArrayIterator (Object[] array)

     {

         this.a = array;

         pos = 0;

     }

     /**

      * @return true if we have not yet reached the end of the enumeration.

      */

     final public boolean hasNext ()

     {

         return (pos < a.length);

     }

     /**

      * Advance the iterator and return the next value. Return null if we

      * reach the end of the enumeration.

      */

     final public Object next () 

     {

         if (pos < a.length)

         {

             return a[pos++];

         }

         else

         {

             throw new NoSuchElementException("Advanced beyond end of array");

         }

     }

     /**

      * Unsupported.

      */

     final public void remove ()

     {

         throw new UnsupportedOperationException();

     }

     /**

      * Test harness.

      */

     static public void main (String arg[])

     {

         try

         {

             Iterator i = new ArrayIterator(arg);

             while (i.hasNext())

             {

                 System.out.println("item: " + i.next());

             }

         }

         catch (Exception e)

         {

             e.printStackTrace();

         }

     }

 }