private void addCaseNullToSwitch() {
    if (!isInsideCaseLabel()) return;

    final PsiSwitchBlock switchBlock = PsiTreeUtil.getParentOfType(myPosition, PsiSwitchBlock.class, false, PsiMember.class);
    if (switchBlock == null) return;

    final PsiType selectorType = getSelectorType(switchBlock);
    if (selectorType instanceof PsiPrimitiveType) return;

    addKeyword(createKeyword(PsiKeyword.NULL));
  }
private void addCaseNullToSwitch()