public static Errorable<Stage.Builder> FromJSON(this StageRequest stm)
{
// Do conversions on the strings and detect any errors:
var maybetreeid = TreeID.TryParse(stm.treeid ?? String.Empty);
if (maybetreeid.HasErrors) return maybetreeid.Errors;
Stage.Builder st = new Stage.Builder(
pName: (StageName)stm.name,
pTreeID: maybetreeid.Value
);
return st;
}
private async Task<Errorable<Stage>> getStageByName(StageName stageName)
{
FileInfo fiTracker = system.getStagePathByStageName(stageName);
if (!fiTracker.Exists) return new StageNameDoesNotExistError(stageName);
byte[] buf;
int nr = 0;
using (var fs = new FileStream(fiTracker.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 tag you have!
throw new NotSupportedException();
}
}
Stage.Builder sb = new Stage.Builder();
// Parse the Stage:
using (var ms = new MemoryStream(buf, 0, nr, false))
using (var sr = new StreamReader(ms, Encoding.UTF8))
{
string line = sr.ReadLine();
// Set Name:
line = sr.ReadLine();
if (line == null || !line.StartsWith("name ")) return new StageParseExpectedNameError();
sb.Name = (StageName)line.Substring("name ".Length);
// Set TreeID:
if (line == null || !line.StartsWith("tree ")) return new StageParseExpectedTreeError();
var ecid = TreeID.TryParse(line.Substring("tree ".Length));
if (ecid.HasErrors) return ecid.Errors;
sb.TreeID = ecid.Value;
return (Stage)sb;
}
}