ClassDefinition


1   /*
2    * @(#)ClassDefinition.java 1.4 04/05/05
3    *
4    * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. 
5    */
6   
7   package java.lang.instrument;
8   
9   /*
10   * Copyright 2003 Wily Technology, Inc.
11   */
12  
13  /**
14   * This class serves as a parameter block to the <code>Instrumentation.redefineClasses</code> method.
15   * Serves to bind the <code>Class</code> that needs redefining together with the new class file bytes.
16   *
17   * @see     java.lang.instrument.Instrumentation#redefineClasses
18   * @since   JDK1.5
19   */
20  public final class ClassDefinition {
21      /**
22       *  The class to redefine
23       */
24      private final   Class     mClass;
25      
26      /**
27       *  The replacement class file bytes
28       */
29      private final   byte[]  mClassFile;
30  
31      /**
32       *  Creates a new <code>ClassDefinition</code> binding using the supplied
33       *  class and class file bytes. Does not copy the supplied buffer, just captures a reference to it.
34       *
35       * @param theClass the <code>Class</code> that needs redefining
36       * @param theClassFile the new class file bytes
37       *
38       * @throws java.lang.NullPointerException if the supplied class or array is <code>null</code>.
39       */
40      public
41      ClassDefinition(    Class  <?> theClass,
42                          byte[]  theClassFile) {
43          if (theClass == null || theClassFile == null) {
44              throw new NullPointerException  ();
45          }
46          mClass      = theClass;
47          mClassFile  = theClassFile;
48      }
49  
50      /**
51       * Returns the class.
52       *
53       * @return    the <code>Class</code> object referred to.
54       */
55      public Class  <?>
56      getDefinitionClass() {
57          return mClass;
58      }
59  
60      /**
61       * Returns the array of bytes that contains the new class file.
62       *
63       * @return    the class file bytes.
64       */
65      public byte[]
66      getDefinitionClassFile() {
67          return mClassFile;
68      }
69  }
70
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