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1 package jfun.yan.util.deserializer;
2
3
4 import java.lang.reflect.Constructor  ;
5 import java.lang.reflect.InvocationTargetException ;
6
7 import jfun.yan.ComponentInstantiationException;
8
9
17 final class DefaultConstructedThreadLocalSerializable
18 implements java.io.Serializable {
19 public Object get(){
20 return store.get();
21 }
22 private static Constructor getDefaultConstructor(final Class type){
23 try{
24 return type.getConstructor(null);
25 }
26 catch(NoSuchMethodException e){
27 throw new IllegalArgumentException ("default constructor of "+type
28 + " not found.");
29 }
30 }
31 private static final class ThreadLocalStore extends ThreadLocal {
32 private final Constructor ctor;
33 ThreadLocalStore(Class type) {
34 this.ctor = getDefaultConstructor(type);
35 }
36 public String toString(){
37 return ctor.getDeclaringClass().getName();
38 }
39 protected Object initialValue() {
40 try{
41 return ctor.newInstance(null);
42 }
43 catch(InstantiationException e){
44 throw new IllegalArgumentException ("failed to invoke default constructor of "
45 + ctor.getDeclaringClass());
46 }
47 catch(IllegalAccessException e){
48 throw new IllegalArgumentException ("cannot access default constructor of "
49 + ctor.getDeclaringClass());
50 }
51 catch(InvocationTargetException e){
52 throw new ComponentInstantiationException("default constructor failed.",
53 e.getTargetException());
54 }
55 }
56 }
57 public String toString(){
58 return type.getName();
59 }
60 private final Class type;
61 private transient ThreadLocalStore store;
62 private void readObject(java.io.ObjectInputStream in)
63 throws ClassNotFoundException , java.io.IOException {
64 in.defaultReadObject();
65 store = new ThreadLocalStore(type);
66 }
67 public DefaultConstructedThreadLocalSerializable(Class type){
68 this.type = type;
69 this.store = new ThreadLocalStore(type);
70 }
71 }
72 |
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