boolean (@NotNull PsiSwitchLabelStatementBase switchCaseLabel) { if (switchCaseLabel.getCaseLabelElementList() == null) return false; final PsiCaseLabelElement[] elements = switchCaseLabel.getCaseLabelElementList().getElements(); if (elements.length != 1) return false; return elements[0].getNode().getFirstChildNode().getElementType() == JavaTokenType.NULL_KEYWORD; }