/// <summary>
/// Gets the <see cref="Track" /> at a given index in this <see cref="TrackList" />.
/// </summary>
/// <param name="index">The index of which to get the <see cref="Track" />.</param>
/// <returns>The <see cref="Track" /> at the given <paramref name="index" />.</returns>
public Track this[int index]
{
get
{
// Bounds check
if (index < 0 || index >= Count)
{
throw new IndexOutOfRangeException();
}
// Looking in cached parts
TrackListPart part =
_parts.FirstOrDefault(p => p.Offset <= index && p.Offset + p.Tracks.Count() > index);
if (part != null)
{
return(part.Tracks.ElementAt(index - part.Offset));
}
// Fetch parts untill we have the right part
TrackListPart current = _parts.Last();
while (current.Offset + current.Tracks.Count() < index)
{
current = current.Next;
_parts.Add(current);
}
return(current.Tracks.ElementAt(index - current.Offset));
}
}
private readonly List <TrackListPart> _parts = new List <TrackListPart>(); //Cache of all parts
#endregion
#region Constructors
/// <summary>
/// Initializes a new instance of the <see cref="TrackList" />.
/// </summary>
/// <param name="first">The first part of the list.</param>
internal TrackList(TrackListPart first)
{
while (first.Offset != 0)
{
_parts.Insert(0, first);
first = first.Previous;
}
_parts.Insert(0, first);
}
