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1   package org.apache.commons.ognl;
2   
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  import java.util.Enumeration;
23  
24  /**
25   * Implementation of ElementsAccessor that returns a single-element iterator, containing the original target object.
26   * 
27   * @author Luke Blanshard (blanshlu@netscape.net)
28   * @author Drew Davidson (drew@ognl.org)
29   */
30  public class ObjectElementsAccessor
31      implements ElementsAccessor
32  {
33      /**
34       * {@inheritDoc}
35       */
36      public Enumeration<?> getElements( Object target )
37      {
38          final Object object = target;
39  
40          return new Enumeration<Object>()
41          {
42              private boolean seen = false;
43  
44              public boolean hasMoreElements()
45              {
46                  return !seen;
47              }
48  
49              public Object nextElement()
50              {
51                  Object result = null;
52  
53                  if ( !seen )
54                  {
55                      result = object;
56                      seen = true;
57                  }
58                  return result;
59              }
60          };
61      }
62  }