static @Nullable Value fromField(@NotNull PsiField field) {
      String name = field.getName();
      PsiClass aClass = field.getContainingClass();
      if (aClass == null) return null;
      String className = aClass.getQualifiedName();
      if (className == null) return null;
      Object value = field.computeConstantValue();
      if (value == null) return null;
      return new Value(className + "." + field.getName(), name, value);
    }
static @Nullable Value fromField(@NotNull PsiField field)