How to write an annotation/aspect to not enter a method but return null if a given condition is false?

Question

I currently have a requirement where I need to return null from 100s of methods if a given condition is false. I was thinking of using Java Annotations or Spring Aspects for thi

Answer 1

If I get you correctly, Spring @Conditional annotation is what you want. You create some public class that implements Spring's Condition interface:

public class Test implements Condition {
...
}

Then you use the forementioned annotation with the parameter which takes as an argument that public class.

@Conditional(Test.class)
public Object someMethod(boolean context){
/*and so do some logics; if the value of 'context' variable is false, you can return 
null; otherwise, just return like this*/
return new someMethodImpl1();
}

Hope I helped. And I'm glad of any kind of corrections. Cheers!