JavaAccessibility


1   package org.python.core;
2   import java.lang.reflect.*;
3   
4   /**
5    * Provides a means of using the Java 2
6    * {Field|Method|Constructor}.setAccessibility() methods that can be
7    * compiled with Java 1 or Java 2.
8    *
9    * When compiling with Java 2, Java2Accessibility.java must also be
10   * compiled.  If compiled Java 1, or if the Java2Accessibility class cannot
11   * be found, then the methods here have no effect.
12   */
13  
14  class JavaAccessibility
15  {
16      private static JavaAccessibility access = null;
17  
18      static void initialize() {
19          // If we can find it, and the registry option
20          // python.security.respectJavaAccessibility is set, then we set the
21          // access object to an instance of the subclass Java2Accessibility
22          if (Options.respectJavaAccessibility)
23              return;
24          try {
25              Class   c = Class.forName("org.python.core.Java2Accessibility");
26              Class.forName("java.lang.reflect.AccessibleObject");
27              access = (JavaAccessibility)c.newInstance();
28          }
29          catch (InstantiationException   e) {}
30          catch (IllegalAccessException   e) {}
31          catch (ClassNotFoundException   e) {}
32      }
33  
34      static boolean accessIsMutable() {
35          return access != null;
36      }
37  
38      /**
39       * These methods get overridden in the Java2Accessibility subclass
40       */
41      void setAccess(Field field, boolean flag) throws SecurityException   {
42      }
43  
44      void setAccess(Method method, boolean flag) throws SecurityException   {
45      }
46  
47      void setAccess(Constructor constructor, boolean flag)
48          throws SecurityException  
49      {}
50  
51      public static void setAccessible(Field field, boolean flag)
52          throws SecurityException  
53      {
54          if (access != null)
55              access.setAccess(field, flag);
56      }
57  
58      public static void setAccessible(Method method, boolean flag)
59          throws SecurityException  
60      {
61          if (access != null)
62              access.setAccess(method, flag);
63      }
64  
65      public static void setAccessible(Constructor constructor, boolean flag)
66          throws SecurityException  
67      {
68          if (access != null)
69              access.setAccess(constructor, flag);
70      }
71  }
72
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