private static boolean isStatic(@Nullable PsiModifierListOwner owner) {
    if (owner == null) return false;
    if (owner instanceof PsiClass && ClassUtil.isTopLevelClass((PsiClass)owner)) return true;
    PsiModifierList modifierList = owner.getModifierList();
    return modifierList != null && modifierList.hasModifierProperty(PsiModifier.STATIC);
  }
private static boolean isStatic(@Nullable PsiModifierListOwner owner)