public void collectFrom(TypeMirror typeMirror) {
    if (typeMirror.getKind() == TypeKind.DECLARED) {
      collectHierarchyMirrors(typeMirror, stringify(typeMirror));
    }
  }
overridable stringify.
@param input the input
@param context the context
@return the string
generator/src/org/immutables/generator/TypeHierarchyCollector.java