private static async Task <IndexValueModel> GetIndexRowForCondition(NeedleInHaystackColumnCondition condition, FileStream indexFile,
IndexMetadataSectionModel relevantSection, long endOffset)
{
indexFile.Seek(relevantSection.Offset, SeekOrigin.Begin);
var indexRows = indexFile.GetDeserializedRowsFromFileAsync <IndexValueModel>(endOffset);
var indexRow = await indexRows.FirstOrDefaultAsync(row => row.Value.Equals(condition.Value));
return(indexRow);
}
private IEnumerable <IndexMetadataSectionModel> CreateMetadataFromRows(IList <FileRowMetadata> rowMetadatas)
{
var numOfRows = rowMetadatas.Count;
for (var i = 0; i < numOfRows; i += _numOfRowsPerMetadataSection)
{
var currentRow = rowMetadatas[i];
var min = currentRow.Value;
var endRow = Math.Min(i + _numOfRowsPerMetadataSection - 1, numOfRows - 1);
var max = rowMetadatas[endRow].Value;
var offset = currentRow.Offset;
var metadataSection = new IndexMetadataSectionModel(min, max, offset);
yield return(metadataSection);
}
}