protected SalaryFieldHandler(string minFieldName, string maxFieldName, IBooster booster)
{
_minFieldName = minFieldName;
_maxFieldName = maxFieldName;
_booster = booster;
_nullSalaryFilter = NumericRangeFilter.newIntRange(_maxFieldName, new java.lang.Integer(0), new java.lang.Integer(0), true, true);
// nonNullSalary <=> NOT nullSalary
_nonNullSalaryFilter = new BooleanFilter();
_nonNullSalaryFilter.add(new FilterClause(_nullSalaryFilter, BooleanClause.Occur.MUST_NOT));
}