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10
11 package org.mule.transport;
12
13 import java.io.ObjectStreamException;
14 import java.io.Serializable;
15
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18
19
20 public final class NullPayload implements Serializable
21 {
22
23
24
25 private static final long serialVersionUID = 3530905899811505080L;
26
27 private static class NullPayloadHolder
28 {
29 private static final NullPayload instance = new NullPayload();
30 }
31
32 public static NullPayload getInstance()
33 {
34 return NullPayloadHolder.instance;
35 }
36
37 private NullPayload()
38 {
39 super();
40 }
41
42 private Object readResolve() throws ObjectStreamException
43 {
44 return NullPayloadHolder.instance;
45 }
46
47 @Override
48 public boolean equals(Object obj)
49 {
50 return obj instanceof NullPayload;
51 }
52
53 @Override
54 public int hashCode ()
55 {
56 return 1;
57 }
58
59 @Override
60 public String toString()
61 {
62 return "{NullPayload}";
63 }
64
65 }