Simple getter invoker with Byte buddy

Question

I am just learning byte buddy, and want to create the simplest getter invoker, but, unfortunately could find how to do it. So, the problem:

I have a lot classes, that I scan and if I find in a class a field that is annotated with FooAnnotation annotation I must be able to get the value of this field using this class instance getter method.

This is my code:

interface GetterInvoker<T, S> {

    //this method must `return instance.getterMethod()`;
    S getValueFrom(T instance);
}

abstract class AsbtractGetterInvoker implements GetterInvoker {
    //...some logic
}

Main code

//input
Class<?> scannedClass = ...
Field annotatedField = ....
Method getterMethod = ....

//generating class
Class<?> tempClass = new ByteBuddy()
    .subclass(AsbtractGetterInvoker.class, ConstructorStrategy.Default.IMITATE_SUPER_CLASS)
    .method(named("getValueFrom").and(takesArguments(1)))
    .intercept(???????)
    .make()
    .load(getClass().getClassLoader())
    .getLoaded();

Could anyone say how to do it?

Answer 1

You'd create such an implementation using MethodCall which allows you to do exactly this.