public static Boolean getConstBoolean(PsiExpression operand) {
    if (operand == null) return null;
    operand = PsiUtil.deparenthesizeExpression(operand);
    if (operand == null) return null;
    String text = operand.getText();
    return PsiKeyword.TRUE.equals(text) ? Boolean.TRUE : PsiKeyword.FALSE.equals(text) ? Boolean.FALSE : null;
  }
public static Boolean getConstBoolean(PsiExpression operand)