private Table(string path, VersionSet versionSet)
{
m_versionSet = versionSet;
m_path = path;
if (m_versionSet.HasComparator)
{
if (m_versionSet.Comparator == "leveldb.BytewiseComparator")
{
m_comparer = new BytewiseComparator();
}
else
{
throw new Exception("Not supported yet");
}
}
}
public static Table OpenRead(string directory)
{
// get the filename of the manifest.
var current = File.ReadAllLines(Path.Combine(directory, "CURRENT"));
if (current.Length < 1)
{
throw new Exception("Invalid CURRENT file.");
}
// read the manifest file.
var versionSet = new VersionSet();
var block = new byte[32768];
using (var file = File.OpenRead(Path.Combine(directory, current[0])))
{
var recordReader = new RecordReader();
int numRead = 0;
do
{
numRead = file.Read(block);
if (numRead > 0)
{
var sequence = new ReadOnlySequence <byte>(block);
var reader = new SequenceReader <byte>(sequence);
while (reader.Remaining > 6)
{
if (!recordReader.From(ref reader, record => versionSet.Add(record)))
{
break;
}
}
}
} while (numRead >= block.Length);
}
return(new Table(directory, versionSet));
}
