XmlDoubleSortKey.cs

Go to the documentation of this file.

namespace System.Xml.Xsl.Runtime;
 
internal sealed class XmlDoubleSortKey : XmlSortKey
{
    private readonly double _dblVal;
 
    private readonly bool _isNaN;
 
    public XmlDoubleSortKey(double value, XmlCollation collation)
    {
        if (double.IsNaN(value))
        {
            _isNaN = true;
            _dblVal = ((collation.EmptyGreatest != collation.DescendingOrder) ? double.PositiveInfinity : double.NegativeInfinity);
        }
        else
        {
            _dblVal = (collation.DescendingOrder ? (0.0 - value) : value);
        }
    }
 
    public override int CompareTo(object obj)
    {
        if (!(obj is XmlDoubleSortKey xmlDoubleSortKey))
        {
            if (_isNaN)
            {
                return BreakSortingTie(obj as XmlSortKey);
            }
            return CompareToEmpty(obj);
        }
        if (_dblVal == xmlDoubleSortKey._dblVal)
        {
            if (_isNaN)
            {
                if (xmlDoubleSortKey._isNaN)
                {
                    return BreakSortingTie(xmlDoubleSortKey);
                }
                if (_dblVal != double.NegativeInfinity)
                {
                    return 1;
                }
                return -1;
            }
            if (xmlDoubleSortKey._isNaN)
            {
                if (xmlDoubleSortKey._dblVal != double.NegativeInfinity)
                {
                    return -1;
                }
                return 1;
            }
            return BreakSortingTie(xmlDoubleSortKey);
        }
        if (!(_dblVal < xmlDoubleSortKey._dblVal))
        {
            return 1;
        }
        return -1;
    }
}