LazyComponent2Component


1   /**
2    * 
3    */
4   package jfun.yan;
5   
6   import jfun.yan.util.ReflectionUtil;
7   
8   final class LazyComponent2Component<T> extends Component<T> {
9     private final LazyComponent<T> lcc;
10  
11    private final Object   key;
12  
13    private Class   type;
14  
15    public boolean equals(Object   obj) {
16      if(obj instanceof LazyComponent2Component){
17        final LazyComponent2Component other = (LazyComponent2Component)obj;
18        return lcc.equals(other.lcc);
19      }
20      else return false;
21    }
22  
23    public int hashCode() {
24      return lcc.hashCode();
25    }
26  
27    LazyComponent2Component(LazyComponent<T> lcc, Object   key) {
28      this.lcc = lcc;
29      this.key = key;
30    }
31  
32    public T create(Dependency dependency){
33      final T r = Components.ensureComponent(eval(), key)
34      .create(dependency);
35      return r;
36    }
37  
38    public boolean isConcrete(){
39      return false;
40    }
41  
42    public synchronized Class   getType(){
43      if(type==null){
44        this.type = lcc.getType();
45      }
46      return this.type;
47      //do not call eval(), since it could cause infinite recursion.
48      /*
49      if(t!=null) return t;
50      final Component real = eval();
51      if(real==null) return null;
52      return real.getType();*/
53    }
54  
55    public Class   verify(Dependency dependency){
56      final Class   t = Components.ensureComponent(eval(), key)
57      .verify(dependency);
58      if(t!=null)
59        cacheType(t);
60      return t;
61    }
62  
63    private synchronized void cacheType(Class  <T> type){
64      if(this.type==null || !ReflectionUtil.isAssignableFrom(type, this.type)){
65        this.type = type;
66      }
67    }
68  
69    public boolean isSingleton(){
70      return false;
71    }
72  
73    private Component<T> eval(){
74      return lcc.eval();
75    }
76  
77    public String   toString(){
78      return lcc.toString();
79    }
80  }
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