/// <summary>
/// Looks up the input objectId in memory based on its identity.
/// </summary>
/// <param name="objectId"></param>
/// <param name="dataFileOffset"></param>
/// <param name="dateSizeBytes"></param>
/// <returns></returns>
public bool Get(ObjectId objectId, ref int dataFileOffset, ref int dateSizeBytes)
{
if (mKeys.ContainsKey(objectId))
{
OffsetAndLength offsetAndLength = mKeys[objectId];
dataFileOffset = offsetAndLength.fileOffset;
dateSizeBytes = offsetAndLength.sizeBytes;
return(true);
}
return(false);
}
/// <summary>
/// Writes the Key File to persistent storage.
/// </summary>
public void Save()
{
var outputStream = new StreamWriter(mPathname);
foreach (KeyValuePair <ObjectId, OffsetAndLength> entry in mKeys)
{
OffsetAndLength offsetAndLength = entry.Value;
String outputline = entry.Key + " " +
offsetAndLength.fileOffset + " " +
offsetAndLength.sizeBytes + "\r\n";
outputStream.Write(outputline);
}
outputStream.Close();
}
/// <summary>
/// Adds / updates the input objectId into memory.
/// </summary>
/// <param name="objectId"></param>
/// <param name="dataFileOffset"></param>
/// <param name="dataSizeBytes"></param>
public void Update(ObjectId objectId, int dataFileOffset, int dataSizeBytes)
{
var offsetAndLength = new OffsetAndLength();
offsetAndLength.fileOffset = dataFileOffset;
offsetAndLength.sizeBytes = dataSizeBytes;
if (mKeys.ContainsKey(objectId))
{
mKeys[objectId] = offsetAndLength;
}
else
{
mKeys.Add(objectId, offsetAndLength);
}
}
/// <summary>
/// Loads the Key File into memory.
/// </summary>
private void Load()
{
var classNameMap = new Dictionary <String, int>();
if (File.Exists(mPathname))
{
var fileReader = new StreamReader(mPathname);
var inputLine = fileReader.ReadLine();
while (inputLine != null)
{
var column = inputLine.Split(' ');
var objectId = new ObjectId(Convert.ToInt32(column[0]));
var offsetAndLength = new OffsetAndLength();
offsetAndLength.fileOffset = Convert.ToInt32(column[1]);
offsetAndLength.sizeBytes = Convert.ToInt32(column[2]);
mKeys.Add(objectId, offsetAndLength);
inputLine = fileReader.ReadLine();
}
fileReader.Close();
}
}
