ArrayIterator


1   /*******************************************************************************
2    * Copyright (c) 2000, 2005 IBM Corporation and others.
3    * All rights reserved. This program and the accompanying materials
4    * are made available under the terms of the Eclipse Public License v1.0
5    * which accompanies this distribution, and is available at
6    * http://www.eclipse.org/legal/epl-v10.html
7    *
8    * Contributors:
9    *     IBM Corporation - initial API and implementation
10   *******************************************************************************/
11  package org.eclipse.core.internal.utils;
12  
13  import java.util.Iterator  ;
14  import java.util.NoSuchElementException  ;
15  
16  /**
17   * An object that iterates over the elements of an array
18   */
19  public class ArrayIterator implements Iterator   {
20      Object  [] elements;
21      int index;
22      int lastElement;
23  
24      /**
25       * Returns new array enumeration over the given object array
26       */
27      public ArrayIterator(Object  [] elements) {
28          this(elements, 0, elements.length - 1);
29      }
30  
31      /**
32       * Returns new array enumeration over the given object array
33       */
34      public ArrayIterator(Object  [] elements, int firstElement, int lastElement) {
35          super();
36          this.elements = elements;
37          index = firstElement;
38          this.lastElement = lastElement;
39      }
40  
41      /**
42       * Returns true if this enumeration contains more elements.
43       */
44      public boolean hasNext() {
45          return elements != null && index <= lastElement;
46      }
47  
48      /**
49       * Returns the next element of this enumeration.
50       * @exception  NoSuchElementException  if no more elements exist.
51       */
52      public Object   next() throws NoSuchElementException   {
53          if (!hasNext())
54              throw new NoSuchElementException  ();
55          return elements[index++];
56      }
57  
58      public void remove() {
59          throw new UnsupportedOperationException  ();
60      }
61  }
62
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