public static List<PsiField> createFields(@NotNull PsiClass containingClass, @NotNull Collection<PsiMember> psiMembers) {
    final Set<String> existingFieldNames = PsiClassUtil.collectClassFieldsIntern(containingClass).stream().map(PsiField::getName).collect(Collectors.toSet());
    final PsiElementFactory psiElementFactory = JavaPsiFacade.getElementFactory(containingClass.getProject());
    final PsiClassType classType = psiElementFactory.createType(containingClass);
    boolean makeUppercased = useUppercasedConstants(containingClass);
    return psiMembers.stream()
      .filter(psiMember -> !existingFieldNames.contains(makeFieldNameConstant(psiMember, makeUppercased)))
      .map(psiField -> {
        if (containingClass.isEnum()) {
          return createEnumConstant(psiField, makeUppercased, containingClass, classType);
        }
        return createFieldNameConstant(psiField, makeUppercased, containingClass);
      }).collect(Collectors.toList());
  }
public static List<PsiField> createFields(@NotNull PsiClass containingClass, @NotNull Collection<PsiMember> psiMembers)