PayloadKey


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15    * Lesser General Public License for more details.
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22  package org.jboss.aop.util;
23  
24  import java.io.ObjectStreamException  ;
25  import java.io.Serializable  ;
26  import java.util.ArrayList  ;
27  
28  /**
29   * Type safe enumeration used for to identify the payloads.
30   */
31  public final class PayloadKey implements Serializable  
32  {
33  
34     static final long serialVersionUID = 7688683906350419871L;
35  
36     // these fields are used for serialization
37     private static int nextOrdinal = 0;
38  
39     private static final ArrayList   values = new ArrayList  (3);
40  
41     /** Put me in the transient map, not part of payload. */
42     public final static PayloadKey TRANSIENT = new PayloadKey("TRANSIENT");
43  
44     /** Do not serialize me, part of payload as is. */
45     public final static PayloadKey AS_IS = new PayloadKey("AS_IS");
46  
47     /** Put me in the payload map. */
48     public final static PayloadKey MARSHALLED = new PayloadKey("MARSHALLED");
49  
50     private final transient String   name;
51  
52     // this is the only value serialized
53     private final int ordinal;
54  
55     private PayloadKey(String   name)
56     {
57        this.name = name;
58        this.ordinal = nextOrdinal++;
59        values.add(this);
60     }
61  
62     public String   toString()
63     {
64        return name;
65     }
66  
67     Object   readResolve() throws ObjectStreamException  
68     {
69        return values.get(ordinal);
70     }
71  }
72
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