1 /*
2 * $Id: IteratorFilterSupport.java 418521 2006-07-01 23:36:50Z mrdon $
3 *
4 * Copyright 2006 The Apache Software Foundation.
5 *
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18 package org.apache.struts2.util;
19
20 import java.util.Enumeration;
21 import java.util.Iterator;
22
23
24 /***
25 * A base class for iterator filters
26 *
27 */
28 public abstract class IteratorFilterSupport {
29
30 // Protected implementation --------------------------------------
31 protected Object getIterator(Object source) {
32 return MakeIterator.convert(source);
33 }
34
35
36 // Wrapper for enumerations
37 public class EnumerationIterator implements Iterator {
38 Enumeration enumeration;
39
40 public EnumerationIterator(Enumeration aEnum) {
41 enumeration = aEnum;
42 }
43
44 public boolean hasNext() {
45 return enumeration.hasMoreElements();
46 }
47
48 public Object next() {
49 return enumeration.nextElement();
50 }
51
52 public void remove() {
53 throw new UnsupportedOperationException("Remove is not supported in IteratorFilterSupport.");
54 }
55 }
56 }