|
1 package jfun.yan;
2
3 import java.util.Arrays  ;
4 import java.util.List ;
5
6 import jfun.util.Misc;
7
8
14 final class AutoDetectingComponent<T> extends Component<T> {
15 private final Class <T> type;
16 private final Object [] keys;
17 AutoDetectingComponent(Class <T> type, final Object [] keys) {
18 this.type = type;
19 this.keys = keys;
20 }
21
22 public boolean equals(Object obj) {
23 if(obj instanceof AutoDetectingComponent){
24 final AutoDetectingComponent other = (AutoDetectingComponent)obj;
25 return type.equals(other.type) && Arrays.equals(keys, other.keys);
26 }
27 else return false;
28 }
29
30 public int hashCode() {
31 return type.hashCode()*31+Misc.getArrayHashcode(keys);
32 }
33
34 public Class verify(Dependency dependency){
35 return detect(dependency).verify(dependency);
36 }
37
38 public T create(Dependency dependency){
39 return detect(dependency).create(dependency);
40 }
41 private Component<T> detect(Dependency dep){
42 final ComponentMap cmap = dep.getComponentMap();
43 final List <Component<T>> candidates = cmap.getComponentsOfType(type);
44 if(candidates.isEmpty() || candidates.size()>1){
45 return detectAlternatives(cmap);
46 }
47 else return candidates.get(0);
48 }
49 private Component detectAlternatives(ComponentMap cmap){
50 for(int i=0; i<keys.length; i++){
51 final Object key = keys[i];
52 Component c = cmap.getComponent(key);
53 if(c!=null) return c;
54 }
55 throw new UnresolvedComponentException(type);
56 }
57 public boolean isSingleton(){
58 return false;
59 }
60
61 public boolean isConcrete(){
62 return false;
63 }
64
65 public Class getType(){
66 return null;
67 }
68
69 public String toString(){
70 return "autodetect <" + Misc.getTypeName(type)+">";
71 }
72 }
73 |
Popular Tags |
Java API By Example, From Geeks To Geeks.