internal void Initialize(int[] columns, StreamReader stream)
{
this.Columns = columns;
stream.BaseStream.Seek(0, SeekOrigin.Begin);
// The first line is the column headers, which we don't need.
var headerLine = stream.ReadLine();
long offset = headerLine.Length + _numberOfLineEndingCharacters;
// Read the actual data lines.
string line;
_index = new SortedDictionary <string, List <long> >();
while ((line = stream.ReadLine()) != null)
{
var record = new QuarterlyDatabaseRecord(line);
var constructedKey = ConstructKey(columns, record);
List <long> offsetList;
if (_index.TryGetValue(constructedKey, out offsetList) == false)
{
offsetList = new List <long>();
_index.Add(constructedKey, offsetList);
}
offsetList.Add(offset);
offset += line.Length + _numberOfLineEndingCharacters;
}
}
private string ConstructKey(int[] columns, QuarterlyDatabaseRecord record)
{
var constructedKey = new StringBuilder();
foreach (int currentColumn in columns)
{
constructedKey.Append(record[currentColumn]);
}
return(constructedKey.ToString());
}
