1 sportbilly 1.1.2.1 // ArrayIterator.java, created Tue Jun 15 15:59:04 1999 by cananian
2 sportbilly 1.1.2.1 // Copyright (C) 1998 C. Scott Ananian <cananian@alumni.princeton.edu>
3 sportbilly 1.1.2.1 // Licensed under the terms of the GNU GPL; see COPYING for details.
4 sportbilly 1.1.2.1 package harpoon.Util;
5 sportbilly 1.1.2.1
6 cananian 1.6 import java.util.ListIterator;
7 sportbilly 1.1.2.1 import java.util.NoSuchElementException;
8 sportbilly 1.1.2.1 /**
9 sportbilly 1.1.2.1 * An <code>ArrayIterator</code> iterates over the elements of an array.
10 cananian 1.6 * <p>The <code>add()</code>, <code>set()</code> and <code>remove()</code>
11 cananian 1.6 * methods are <b>not</b> implemented; this iterator is unmodifiable.
12 sportbilly 1.1.2.1 *
13 sportbilly 1.1.2.1 * @author C. Scott Ananian <cananian@alumni.princeton.edu>
14 cananian 1.6 * @version $Id: ArrayIterator.java,v 1.6 2004/02/07 19:26:09 cananian Exp $
15 sportbilly 1.1.2.1 */
16 sportbilly 1.1.2.1
17 cananian 1.6 public class ArrayIterator<E> implements ListIterator<E> {
18 cananian 1.3.2.2 final E[] oa;
19 sportbilly 1.1.2.1 int i = 0;
20 sportbilly 1.1.2.1
21 cananian 1.3.2.3 /** Creates an <code>ArrayIterator</code> that iterates over the
22 cananian 1.3.2.3 * contents of <code>oa</code>. */
23 cananian 1.3.2.2 public ArrayIterator(E[] oa) {
24 cananian 1.3.2.1 assert oa!=null;
25 sportbilly 1.1.2.1 this.oa = oa;
26 sportbilly 1.1.2.1 }
27 sportbilly 1.1.2.1 public boolean hasNext() { return ( i < oa.length ); }
28 cananian 1.3.2.2 public E next() {
29 sportbilly 1.1.2.1 if (i < oa.length)
30 sportbilly 1.1.2.1 return oa[i++];
31 sportbilly 1.1.2.1 else
32 sportbilly 1.1.2.1 throw new NoSuchElementException();
33 cananian 1.6 }
34 cananian 1.6 public int nextIndex() { return i; }
35 cananian 1.6
36 cananian 1.6 public boolean hasPrevious() { return ( i > 0 ); }
37 cananian 1.6 public E previous() {
38 cananian 1.6 if (i > 0)
39 cananian 1.6 return oa[--i];
40 cananian 1.6 else
41 cananian 1.6 throw new NoSuchElementException();
42 cananian 1.6 }
43 cananian 1.6 public int previousIndex() { return i-1; }
44 cananian 1.6
45 cananian 1.6 /* unmodifiable */
46 cananian 1.6 public void add(E o) {
47 cananian 1.6 throw new UnsupportedOperationException();
48 cananian 1.6 }
49 cananian 1.6 public void remove() {
50 cananian 1.6 throw new UnsupportedOperationException();
51 cananian 1.6 }
52 cananian 1.6 public void set(E o) {
53 cananian 1.6 throw new UnsupportedOperationException();
54 sportbilly 1.1.2.1 }
55 cananian 1.2 }