JoinedEnumeration


1   // Copyright (c) 2003-2007, Jodd Team (jodd.sf.net). All Rights Reserved.
2   
3   package jodd.util.collection;
4   
5   import java.util.Enumeration  ;
6   import java.util.NoSuchElementException  ;
7   
8   /**
9    * Joins two enumerations. 
10   */
11  public class JoinedEnumeration implements Enumeration   {
12  
13      private Enumeration   mOne;
14      private Enumeration   mTwo;
15  
16      public JoinedEnumeration(Enumeration   enumeration1, Enumeration   enumeration2) {
17          mOne = enumeration1;
18          mTwo = enumeration2;
19      }
20  
21      public boolean hasMoreElements() {
22          if (mOne != null) {
23              if (mOne.hasMoreElements()) {
24                  return true;
25              }
26              mOne = null;
27          }
28          return mTwo.hasMoreElements();
29      }
30  
31      public Object   nextElement() {
32          if (mOne != null)
33              try {
34                  return mOne.nextElement();
35              } catch (NoSuchElementException   _ex) {
36                  mOne = null;
37              }
38          return mTwo.nextElement();
39      }
40  
41  }
42

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