AspectJ Pointcut expression to intercept enum methods

[Alon Cohen]

Using AspectJ, I want to intercept every toString() invocation on an enum construct.

For example, Assuming GridVisible is an enum that does NOT implement toString():

GridVisible gv = GridVisible.FE;
return gv.toString();

I need an expression that intercepts the call to toString(). I figured that the correct expression would look something like:

@Bind(pointcut = "execution(java.lang.String $instanceof{java.lang.Enum}->toString())")

That doesn't work. I also tried many kinds of combination, mainly using the calling(), $instanceof and $implementing expressions, but to no avail.

Thanks