get the return value of method using annotation processor

Question

I am new to annotation processor, I wonder if it is possible to get the the return value of a method marked with annotations during annotation processing. For example, I have annotation

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface Parameters {}

and I have a class marked with this annotation:

@Parameters
public static Collection<Object[]> data() {
    return Arrays.asList(new Object[][] {
            { 0, 0, 0 }, { 1, 1, 2 }
    });
}

is it possible I get new Object[][] { { 0, 0, 0 }, { 1, 1, 2 } } using annotation processing tool(apt)?

Harry Coder · Accepted Answer · 2022-05-06 03:17:30Z

0

Yes, you can invoke your method with reflection by filtering on the list of methods available in your class and annotated with your custom annotation. Your code will look something like this:

Object[][] objectArray; // should be initialize
Class<?> clazz = object.getClass();
for (Method method : clazz.getDeclaredMethods()) {
    if (method.isAnnotationPresent(Parameters.class)) {
        objectArray = method.invoke(object);
    }
}

return objectArray;

Where object is an instance of your class containing the your method.

answered May 6, 2022 at 3:17

Harry Coder

2,7842 gold badges32 silver badges38 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Molly Tian Over a year ago

is it possible to use annotation processor tool(apt)?

Harry Coder Over a year ago

Yes it is possible to use apt. docs.oracle.com/javase/7/docs/technotes/guides/apt/….

Collectives™ on Stack Overflow

get the return value of method using annotation processor

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related