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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  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,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  package org.apache.onami.factoryannotation;
20  
21  import java.lang.reflect.AccessibleObject;
22  import java.security.AccessController;
23  import java.security.PrivilegedAction;
24  
25  class AccessibleHelper<T extends AccessibleObject>
26      implements PrivilegedAction<T>
27  {
28  
29      private final T object;
30  
31      private final AccessibleHelperCallback<T> callback;
32  
33      public AccessibleHelper( final T object, final AccessibleHelperCallback<T> callback )
34      {
35  
36          this.object = object;
37          this.callback = callback;
38      }
39  
40      public T run()
41      {
42          final boolean accessible = object.isAccessible();
43          if ( !accessible )
44          {
45              object.setAccessible( true );
46          }
47  
48          callback.execute( object );
49  
50          object.setAccessible( accessible );
51  
52          return object;
53      }
54  
55      public static final <T extends AccessibleObject> void executePrivileged( final T object,
56                                                                               final AccessibleHelperCallback<T> callback )
57      {
58  
59          AccessController.doPrivileged( new AccessibleHelper<T>( object, callback ) );
60      }
61  
62      static interface AccessibleHelperCallback<T>
63      {
64  
65          void execute( T accessibleObject );
66  
67      }
68  
69  }