/// <summary>
/// Retrieve the object map containing the metadata for a given address within the original object.
/// </summary>
/// <param name="key">Object key.</param>
/// <param name="position">Starting byte position.</param>
/// <returns>Dedupe object map.</returns>
public override DedupeObjectMap GetObjectMapForPosition(string key, long position)
{
if (String.IsNullOrEmpty(key))
{
throw new ArgumentNullException(nameof(key));
}
if (position < 0)
{
throw new ArgumentOutOfRangeException("Start of range must be zero or greater.");
}
key = DedupeCommon.SanitizeString(key);
DedupeObject obj = GetObjectMetadata(key);
if (obj == null)
{
return(null);
}
string objMapTable = _ORM.GetTableName(typeof(DedupeObjectMap));
string objKeyCol = _ORM.GetColumnName <DedupeObjectMap>(nameof(DedupeObjectMap.ObjectKey));
string chunkAddrCol = _ORM.GetColumnName <DedupeObjectMap>(nameof(DedupeObjectMap.ChunkAddress));
string chunkLenCol = _ORM.GetColumnName <DedupeObjectMap>(nameof(DedupeObjectMap.ChunkLength));
string query =
"SELECT * FROM " + objMapTable + " " +
"WHERE " +
" " + objKeyCol + " = '" + obj.Key + "' " +
" AND " + chunkAddrCol + " <= " + position + " AND " + chunkAddrCol + " + " + chunkLenCol + " > " + position + " ";
DedupeObjectMap map = null;
DataTable result = _ORM.Query(query);
if (result != null && result.Rows.Count > 0)
{
map = _ORM.DataRowToObject <DedupeObjectMap>(result.Rows[0]);
}
return(map);
}