/// <summary>
/// Creates a sort, possibly in reverse, with a custom comparison function. </summary>
/// <param name="field"> Name of field to sort by; cannot be <c>null</c>. </param>
/// <param name="comparer"> Returns a comparer for sorting hits. </param>
/// <param name="reverse"> <c>True</c> if natural order should be reversed. </param>
public SortField(string field, FieldComparerSource comparer, bool reverse)
{
InitFieldType(field, SortFieldType.CUSTOM);
this.reverse = reverse;
this.comparerSource = comparer;
}
// LUCENENET NOTE: Made this into a property setter above
//public virtual void SetMissingValue(object value)
//{
// if (type == SortFieldType.STRING)
// {
// if (value != STRING_FIRST && value != STRING_LAST)
// {
// throw new System.ArgumentException("For STRING type, missing value must be either STRING_FIRST or STRING_LAST");
// }
// }
// else if (type != SortFieldType.BYTE && type != SortFieldType.SHORT && type != SortFieldType.INT && type != SortFieldType.FLOAT && type != SortFieldType.LONG && type != SortFieldType.DOUBLE)
// {
// throw new System.ArgumentException("Missing value only works for numeric or STRING types");
// }
// this.missingValue = value;
//}
/// <summary>
/// Creates a sort with a custom comparison function. </summary>
/// <param name="field"> Name of field to sort by; cannot be <c>null</c>. </param>
/// <param name="comparer"> Returns a comparer for sorting hits. </param>
public SortField(string field, FieldComparerSource comparer)
{
InitFieldType(field, SortFieldType.CUSTOM);
this.comparerSource = comparer;
}