private List <T> GetRecords <T>(ColumnIndex currentIndex, string[] keys) where T : QuarterlyDatabaseRecord, new()
{
var compositeKey = new StringBuilder();
foreach (var currentKey in keys)
{
compositeKey.Append(currentKey);
}
var matchingRecords = new List <T>();
var offsets = currentIndex.GetOffsets(compositeKey.ToString());
if (offsets != null)
{
foreach (var currentOffset in offsets)
{
reader.BaseStream.Position = currentOffset;
reader.DiscardBufferedData();
var line = reader.ReadLine();
var newRecord = new T();
newRecord.Populate(line);
matchingRecords.Add(newRecord);
}
}
return(matchingRecords);
}
/// <summary>
/// Determines if there is a match between a list of column numbers and an index.
/// </summary>
/// <param name="columns">
/// The list of zero-based columns to compare against the index.
/// </param>
/// <param name="indexCandidate">
/// The index to compare.
/// </param>
/// <returns>
/// True if all of the specified columns are represented in the specified
/// index; false otherwise.
/// </returns>
private bool ColumnsMatch(int[] columns, ColumnIndex indexCandidate)
{
if (columns.Length != indexCandidate.Columns.Length)
{
return(false);
}
foreach (var currentColumn in columns)
{
if (indexCandidate.Columns.Contains(currentColumn) == false)
{
return(false);
}
}
return(true);
}
