Helper functions for the method name and parameter types

Helpers.xtend

def keyToMethodName(String key) {
  CaseFormat.UPPER_UNDERSCORE.to(CaseFormat.LOWER_CAMEL, key).toFirstLower
}

def argumentType(Format format, extension TypeReferenceProvider typeRefs) {
  switch format {
    NumberFormat: Number.newTypeReference
    DateFormat: Date.newTypeReference
    default: object
  }
}