1 /*
2 * $Id: IteratorFilterSupport.java 471756 2006-11-06 15:01:43Z 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.struts2.util;
22
23 import java.util.Enumeration;
24 import java.util.Iterator;
25
26
27 /***
28 * A base class for iterator filters
29 *
30 */
31 public abstract class IteratorFilterSupport {
32
33 // Protected implementation --------------------------------------
34 protected Object getIterator(Object source) {
35 return MakeIterator.convert(source);
36 }
37
38
39 // Wrapper for enumerations
40 public class EnumerationIterator implements Iterator {
41 Enumeration enumeration;
42
43 public EnumerationIterator(Enumeration aEnum) {
44 enumeration = aEnum;
45 }
46
47 public boolean hasNext() {
48 return enumeration.hasMoreElements();
49 }
50
51 public Object next() {
52 return enumeration.nextElement();
53 }
54
55 public void remove() {
56 throw new UnsupportedOperationException("Remove is not supported in IteratorFilterSupport.");
57 }
58 }
59 }