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1
7 package org.hibernate.ejb.callback;
8
9 import java.lang.reflect.Method  ;
10
11
15 public final class CallbackResolver {
16 private CallbackResolver() {}
17
18 public static Callback resolveCallback(Class beanClass, Class annotation, Class listener) throws Exception {
19 Callback callback = null;
20 Method [] methods = beanClass.getDeclaredMethods();
21
22 for ( int i = 0 ; i < methods.length ; i++ ) {
23 if ( methods[i].getAnnotation( annotation ) != null ) {
24 if ( callback == null ) {
25 callback = new BeanCallback( methods[i] );
26 Class returnType = methods[i].getReturnType();
27 Class [] args = methods[i].getParameterTypes();
28 if ( returnType != Void.TYPE && args.length != 0 ) {
29 throw new RuntimeException (
30 "Callback methods annotated on the bean class must return void and take no arguments: " + annotation.getName() + " - " + methods[i]
31 );
32 }
33 }
34 else {
35 throw new RuntimeException (
36 "You can only annotate one callback method with "
37 + annotation.getName() + " in bean class: " + beanClass.getName()
38 );
39 }
40 }
41 }
42
43 if ( listener != null ) {
44 try {
45 methods = listener.getDeclaredMethods();
46 for ( int i = 0 ; i < methods.length ; i++ ) {
47 if ( methods[i].getAnnotation( annotation ) != null ) {
48 if ( callback == null ) {
49 callback = new ListenerCallback( methods[i], listener.newInstance() );
50 Class returnType = methods[i].getReturnType();
51 Class [] args = methods[i].getParameterTypes();
52 if ( returnType != Void.TYPE && args.length != 0 ) {
53 throw new RuntimeException (
54 "Callback methods annotated in a listener bean class must return void and take one argument: " + annotation.getName() + " - " + methods[i]
55 );
56 }
57 }
58 else {
59 throw new RuntimeException (
60 "You can only annotate one callback method with "
61 + annotation.getName() + " in bean class: " + beanClass.getName() + " and callback listener: "
62 + listener.getName()
63 );
64 }
65 }
66 }
67 }
68 catch (Exception e) {
69 throw new RuntimeException ( e.getCause() );
70 }
71 }
72
73 return callback;
74 }
75
76 }
77 |
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