public Task <Errorable <BlobID> > ResolvePartialID(BlobID.Partial id)
{
FileInfo[] fis = system.getPathsByPartialID(id);
if (fis.Length == 1)
{
return(Task.FromResult(BlobID.TryParse(id.ToString().Substring(0, 2) + fis[0].Name)));
}
if (fis.Length == 0)
{
return(Task.FromResult((Errorable <BlobID>) new BlobIDPartialNoResolutionError(id)));
}
return(Task.FromResult((Errorable <BlobID>) new BlobIDPartialAmbiguousResolutionError(id, fis.SelectAsArray(f => BlobID.TryParse(id.ToString().Substring(0, 2) + f.Name).Value))));
}
private async Task <Errorable <TreeNode> > getTree(TreeID id)
{
FileInfo fi = system.getPathByID(id);
if (!fi.Exists)
{
return(new TreeIDRecordDoesNotExistError(id));
}
byte[] buf;
int nr = 0;
using (var fs = new FileStream(fi.FullName, FileMode.Open, FileAccess.Read, FileShare.Read, 16384, true))
{
// TODO: implement an async buffered Stream:
buf = new byte[16384];
nr = await fs.ReadAsync(buf, 0, 16384).ConfigureAwait(continueOnCapturedContext: false);
if (nr >= 16384)
{
// My, what a large tree you have!
throw new NotSupportedException();
}
}
TreeNode.Builder tb = new TreeNode.Builder(new List <TreeTreeReference>(), new List <TreeBlobReference>());
// Parse the Tree:
using (var ms = new MemoryStream(buf, 0, nr, false))
using (var sr = new StreamReader(ms, Encoding.UTF8))
{
string line;
while ((line = sr.ReadLine()) != null)
{
if (line.StartsWith("tree "))
{
string linked_treeid = line.Substring(5, (TreeID.ByteArrayLength * 2));
string name = line.Substring(6 + (TreeID.ByteArrayLength * 2));
// Attempt to parse the TreeID and verify its existence:
Errorable <TreeID> trid = TreeID.TryParse(linked_treeid);
if (trid.HasErrors)
{
return(trid.Errors);
}
if (!system.getPathByID(trid.Value).Exists)
{
return(new TreeIDRecordDoesNotExistError(trid.Value));
}
tb.Trees.Add(new TreeTreeReference.Builder(name, trid.Value));
}
else if (line.StartsWith("blob "))
{
string linked_blobid = line.Substring(5, (TreeID.ByteArrayLength * 2));
string name = line.Substring(6 + (TreeID.ByteArrayLength * 2));
// Attempt to parse the BlobID and verify its existence:
Errorable <BlobID> blid = BlobID.TryParse(linked_blobid);
if (blid.HasErrors)
{
return(blid.Errors);
}
if (!system.getPathByID(blid.Value).Exists)
{
return(new BlobIDRecordDoesNotExistError(blid.Value));
}
tb.Blobs.Add(new TreeBlobReference.Builder(name, blid.Value));
}
}
}
// Create the immutable Tree from the Builder:
TreeNode tr = tb;
// Validate the computed TreeID:
if (tr.ID != id)
{
return(new ComputedTreeIDMismatchError(tr.ID, id));
}
return(tr);
}