private PsiClassType createEnumType() {
    JavaPsiFacade facade = JavaPsiFacade.getInstance(getProject());
    PsiClass enumClass = facade.findClass(JAVA_LANG_ENUM, getResolveScope());
    PsiElementFactory factory = facade.getElementFactory();
    if (enumClass != null) {
      PsiSubstitutor substitutor = PsiSubstitutor.EMPTY;
      PsiTypeParameter[] typeParameters = enumClass.getTypeParameters();
      if (typeParameters.length == 1) {
        substitutor = substitutor.put(typeParameters[0], factory.createType(this));
      }

      return factory.createType(enumClass, substitutor);
    }
    return TypesUtil.createTypeByFQClassName(JAVA_LANG_ENUM, this);
  }
private PsiClassType createEnumType()