public IReadOnlyDirectory Mount(IDisposableDirectory autoDisposingDirectory, string mountRoot)
{
IDirectory mountDir;
if ((mountRoot == "/" || mountRoot == "") &&
!autoDisposingDirectory.EnumerateFiles().Any() &&
!autoDisposingDirectory.EnumerateDirectories().Any())
{
mountDir = autoDisposingDirectory;
}
// ContainsFile checks for directories as well.
else if (!autoDisposingDirectory.ContainsFile(mountRoot))
{
mountDir = autoDisposingDirectory.OpenDirectory(mountRoot);
}
else
{
throw new IOException("Can not mount projection on an non-empty directory or already existing mount point.");
}
if (this.Parent != null)
{
throw new InvalidOperationException("Can not mount subtreee of projection.");
}
var activeDir = mountDir;
foreach (var(name, file) in this.ProjectionState)
{
switch (file)
{
case DirectoryInfo dirInfo:
activeDir.LinkFrom(dirInfo, name);
break;
case FileInfo fileInfo:
activeDir.LinkFrom(fileInfo, name);
break;
}
}
Stack <(string, DirectoryProjection)> projectionsToProcess = new(this.Children.Select((kvp) => (kvp.Key, kvp.Value)));
while (projectionsToProcess.Count > 0)
{
var(projectionName, projectionLevel) = projectionsToProcess.Pop();
activeDir = activeDir.OpenDirectory(projectionName);
foreach (var(name, file) in projectionLevel.ProjectionState)
{
switch (file)
{
case DirectoryInfo dirInfo:
activeDir.LinkFrom(dirInfo, name);
break;
case FileInfo fileInfo:
activeDir.LinkFrom(fileInfo, name);
break;
}
}
foreach (var(name, childProjection) in projectionLevel.Children)
{
projectionsToProcess.Push((name, childProjection));
}
}
return(mountDir.AsReadOnly());
}
public IReadOnlyDirectory Mount(IDisposableDirectory autoDisposingDirectory) => this.Mount(autoDisposingDirectory, "");
