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1 package jfun.yan;
2
3 final class UseDefaultComponent extends Component {
4 public Object  create(Dependency dep){
5 throw getDefaulting();
6 }
7 public Class verify(Dependency dep){
8 throw getDefaulting();
9 }
10 public Class getType(){
11 return void.class;
12 }
13 public boolean isConcrete(){
14 return true;
15 }
16 public boolean isSingleton(){
17 return false;
18 }
19 public String toString(){
20 return "default";
21 }
22 private UseDefaultComponent(){}
23 private static YanException getDefaulting(){
24 return Utils.getThreadLocalException(defaulting);
25 }
26 private static final ThreadLocal defaulting = new ThreadLocal (){
27 protected Object initialValue() {
28 return new DefaultingException();
29 }
30 };
31 private static final Component singleton = new UseDefaultComponent();
32 static Component instance(){
33 return singleton;
34 }
35 }
36 |
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Java API By Example, From Geeks To Geeks.