1 /*
2 * $Id: IteratorFilterSupport.java 651946 2008-04-27 13:41:38Z apetrelli $
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
22 package org.apache.struts2.util;
23
24 import java.util.Enumeration;
25 import java.util.Iterator;
26
27
28 /***
29 * A base class for iterator filters
30 *
31 */
32 public abstract class IteratorFilterSupport {
33
34 // Protected implementation --------------------------------------
35 protected Object getIterator(Object source) {
36 return MakeIterator.convert(source);
37 }
38
39
40 // Wrapper for enumerations
41 public static class EnumerationIterator implements Iterator {
42 Enumeration enumeration;
43
44 public EnumerationIterator(Enumeration aEnum) {
45 enumeration = aEnum;
46 }
47
48 public boolean hasNext() {
49 return enumeration.hasMoreElements();
50 }
51
52 public Object next() {
53 return enumeration.nextElement();
54 }
55
56 public void remove() {
57 throw new UnsupportedOperationException("Remove is not supported in IteratorFilterSupport.");
58 }
59 }
60 }