1 /*
2 * $Id: IteratorAdapter.java 471754 2006-11-06 14:55:09Z husted $
3 *
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21 package org.apache.struts.util;
22
23 import java.util.Enumeration;
24 import java.util.Iterator;
25 import java.util.NoSuchElementException;
26
27 /**
28 * Utility method for converting Enumeration to an Iterator class. If you
29 * attempt to remove() an Object from the iterator, it will throw an
30 * UnsupportedOperationException. Added for use by TagLib so Enumeration can
31 * be supported
32 *
33 * @version $Rev: 471754 $ $Date: 2005-05-07 12:11:38 -0400 (Sat, 07 May 2005)
34 * $
35 */
36 public class IteratorAdapter implements Iterator {
37 private Enumeration e;
38
39 public IteratorAdapter(Enumeration e) {
40 this.e = e;
41 }
42
43 public boolean hasNext() {
44 return e.hasMoreElements();
45 }
46
47 public Object next() {
48 if (!e.hasMoreElements()) {
49 throw new NoSuchElementException(
50 "IteratorAdaptor.next() has no more elements");
51 }
52
53 return e.nextElement();
54 }
55
56 public void remove() {
57 throw new UnsupportedOperationException(
58 "Method IteratorAdaptor.remove() not implemented");
59 }
60 }