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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  }