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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  }