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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    * 
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   * 
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.portals.bridges.util;
18  
19  import java.util.Enumeration;
20  import java.util.NoSuchElementException;
21  
22  /***
23   * @author <a href="mailto:ate@douma.nu">Ate Douma</a>
24   * @version $Id: NamespacedNamesEnumeration.java 549659 2007-06-22 01:21:29Z ate $
25   */
26  public class NamespacedNamesEnumeration implements Enumeration
27  {
28      private Enumeration namesEnumeration;
29      private String      namespace;
30      
31      private String nextName;
32      private boolean done;
33      
34      public NamespacedNamesEnumeration(Enumeration namesEnumeration, String namespace)
35      {
36          this.namesEnumeration = namesEnumeration;
37          this.namespace = namespace;
38          hasMoreElements();
39      }
40      
41      public boolean hasMoreElements()
42      {
43          if (!done)
44          {
45              if (nextName == null)
46              {
47                  while (namesEnumeration.hasMoreElements())
48                  {
49                      String name = (String)namesEnumeration.nextElement();
50                      if ( name.startsWith(namespace))
51                      {
52                          nextName = name.substring(namespace.length());
53                          break;
54                      }
55                  }
56                  done = nextName == null;
57              }
58          }
59          return !done;
60      }
61  
62      public Object nextElement()
63      {
64          if (done)
65          {
66              throw new NoSuchElementException();
67          }
68          String name = nextName;
69          nextName = null;
70          return name;
71      }
72  }