How to use

org.matheclipse.parser.client.operator.ASTNodeFactory$PreMinusOperator

constructor

static public PrefixOperator createPrefixOperator(final String operatorStr, final String headStr,
    final int precedence) {
  PrefixOperator oper;
  if (headStr.equals("PreMinus")) {
    oper = new PreMinusOperator(operatorStr, headStr, precedence);
  } else if (headStr.equals("PrePlus")) {
    oper = new PrePlusOperator(operatorStr, headStr, precedence);
  } else {
    oper = new PrefixOperator(operatorStr, headStr, precedence);
  }
  return oper;
}