// Starts a new file transfer, or adds a new peer if one
// already exists.
public IFileTransfer StartTransfer(Network network, Node node, IFile file)
{
if (node.NodeID == Core.MyNodeID)
{
throw new ArgumentException("You cannot start a file transfer with yourself.");
}
// Don't download files if it already exists in the completed downloads directory.
// If the remote file is different, but has the same filename, it'll globber your copy.
if (!(file is LocalFile))
{
if (IO.File.Exists(IO.Path.Combine(Core.Settings.CompletedDownloadDir, file.Name)))
{
throw new Exception("A file by that name already exists in your download directory.");
}
}
IFileTransfer transfer = null;
lock (this.transfers)
{
transfer = this.transfers.SingleOrDefault(t => t.File == file);
}
if (transfer == null)
{
transfer = Provider.CreateFileTransfer(file);
lock (this.transfers)
{
this.transfers.Add(transfer);
}
RaiseNewTransfer(transfer);
}
transfer.AddPeer(network, node);
transfer.Start();
return(transfer);
}