i'm working on a spring project and i want to make annotation.
I need something like the description below :
@CustomAnnotation("b")
public int a(int value) {
return value;
}
public int b(int value) {
return value + 1 ;
}
--------------------------
Execute :
a(1) // should return '2'
You can use Aspect. For example, you have following annotation
@Target(METHOD)
@Retention(RUNTIME)
public @interface Delegate {
String value(); // this is the target method name
}
Then add the aspect component into your spring context
@Aspect // indicate the component is used for aspect
@Component
public class DelegateAspect {
@Around(value = "@annotation(anno)", argNames = "jp, anno") // aspect method who have the annotation @Delegate
public Object handle(ProceedingJoinPoint joinPoint, Delegate delegate) throws Exception {
Object obj = joinPoint.getThis(); // get the object
Method method = ((MethodSignature) joinPoint.getSignature()).getMethod(); // get the origin method
Method target = obj.getClass().getMethod(delegate.value(), method.getParameterTypes()); // get the delegate method
return target.invoke(obj, joinPoint.getArgs()); // invoke the delegate method
}
}
Now you can use @Delegate to delegate methods
@Component
public class DelegateBean {
@Delegate("b")
public void a(int i) {
System.out.println("a: " + i);
}
public void b(int i) {
System.out.println("b: " + i);
}
}
Let's test
@Inject
public void init(DelegateBean a) {
a.a(1);
a.b(1);
}
Output is
b: 1
b: 1
