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1 package tests.jfun.models;
2
3 import java.lang.reflect.InvocationHandler  ;
4 import java.lang.reflect.Method ;
5 import java.lang.reflect.Proxy ;
6
7 public class InjectingDecorator implements InvocationHandler {
8 private final Injector injector;
9 private final Class target_type;
10 private final Object self;
11
12 private InjectingDecorator(Object self, Class target_type, Injector injector) {
13 this.injector = injector;
14 this.self = self;
15 this.target_type = target_type;
16 }
17 public Object invoke(Object proxy, Method mtd, Object [] args)
18 throws Throwable {
19 if(Object .class.equals(mtd.getDeclaringClass())){
20 return mtd.invoke(this, args);
21 }
22 else{
23 final Object r = mtd.invoke(self, args);
24 if(target_type.isInstance(r)){
25 injector.inject(r);
27 }
28 return r;
29 }
30 }
31 public boolean equals(Object obj) {
32 if(obj == null) return false;
33 if(Proxy.isProxyClass(obj.getClass())){
34 obj = Proxy.getInvocationHandler(obj);
35 }
36 if(obj instanceof InjectingDecorator){
37 final InjectingDecorator other = (InjectingDecorator)obj;
38 return self.equals(other.self);
39 }
40 else return self.equals(obj);
41 }
42 public int hashCode() {
43 return self.hashCode();
44 }
45 public String toString() {
46 return self.toString();
47 }
48 public static Object getInjectingDecorator(ClassLoader cloader, Class [] itfs,
49 Object self, Class injectee_type, Injector injector){
50 return Proxy.newProxyInstance(cloader, itfs,
51 new InjectingDecorator(self, injectee_type, injector));
52 }
53 public static Object getInjectingDecorator(ClassLoader cloader, Class itf,
54 Object self, Class injectee_type, Injector injector){
55 return getInjectingDecorator(cloader, new Class []{itf}, self, injectee_type, injector);
56 }
57 public static Object getInjectingDecorator(Class itf, Object self, Class injectee_type, Injector injector){
58 return getInjectingDecorator(injectee_type.getClassLoader(), itf, self, injectee_type, injector);
59 }
60 public static Object getInjectingDecorator(Object self, Class injectee_type, Injector injector){
61 final Class [] itfs = self.getClass().getInterfaces();
62 return getInjectingDecorator(injectee_type.getClassLoader(), itfs,
63 self, injectee_type, injector);
64 }
65 }
66 |
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