CODEWITHSUNDEEP
javareflectionbyte-buddy
duke
duke

Reputation: 1

Alter method access to an argument using bytebuddy

I have a case like the example below 

public String test(Trail trail) {
  AnotherClass.access(trail);
  this.executeAnotherMethod(trail);
  futureCall(trail::end);
  return "emptyString";
}

And I want to use byte-buddy to do something like this

public String test(Trail trail) {
  Trail clonedTrail = trail.clone("test");
  AnotherClass.access(clonedTrail);
  this.executeAnotherMethod(clonedTrail);
  futureCall(clonedTrail::end);
  return "emptyString";
}

I have tried Advice to intercept the call but that messed up object reference. I have been diving through byte-buddy testcases as well as reading ASM, but haven't made great progress so far.

Upvotes: 0

Views: 303

Answers (1)

Rafael Winterhalter
Rafael Winterhalter

Reputation: 44032

This can be done with advice by overwriting the argument.

@Advice.OnMethodEnter
static void enter(@Advice.Argument(readOnly = false) Trail trail) {
  trail = trail.clone("test");
}

Upvotes: 0

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