Easy way to access mixins

When we add mixins to a class, the mixins are available through the mixedIn property. We can access a particular mixin by using, for example

mixedIn[ClassA].foo()

This works well if we know what mixins are part of the class.

There are times when we want to be able to

(a) get a list of mixins, and

(b) be able to get a mixin one before the current mixin.

For example, something like

mixedIn.getPrevious(ClassA) would be very useful for method chaining purposes.

Right now, I had to do the following to get to this (if there is a simpler way and I simply don't know it, please correct me):

def invokeOnPreviousMixin(MetaClass currentMixinMetaClass, String method, Object[] args) {
  def previousMixin = getClass()

  for(mixin in mixedIn.mixinClasses) { //Accessing private variable here
    if(mixin.mixinClass.theClass == currentMixinMetaClass.delegate.theClass) break
    previousMixin = mixin.mixinClass.theClass
  }

  mixedIn[previousMixin]."$method"(*args)  
}

Thanks.