public Index(string fileName, string indexName, int mainPageSize = 0, Mode mode = Mode.Read) { MainPageSize = mainPageSize; _indexPath = indexName; _filePath = fileName; IndexUnit.Path = indexName; MainReader = new MainReader(fileName, MainPageSize, mode); MainWriter = new MainWriter(fileName, MainPageSize, mode); FilePage.PageSize = mainPageSize; if (mode == Mode.New) { Initialize(); } if (mode == Mode.Read) { MetaData.Read(); IndexUnit.Init(false); IndexUnit.ReadIndex(); FilePage.PageSize = MainPageSize; MainReader = new MainReader(fileName, MainPageSize, mode); MainWriter = new MainWriter(fileName, MainPageSize, mode); IndexUnit.WriteIndex(); } MetaData.Save(); }
private void Initialize() { //fill primary area with empty pages //set overflow area address long addrI = 0L, addrM = 0L; try { File.Delete("meta"); } catch { } IndexUnit.Init(true); var firstMainPage = new FilePage { Address = addrM++, Count = 1 }; firstMainPage.Entries[0] = new Tuple <Record, long>(new Record(), -1); MainWriter.WritePage(firstMainPage); MainPages = 1; MainRecordCount = 1; OverflowAddress = MainWriter.Writer.Position; OverflowFirstPageNumber = MainReader.PageNumberFromAddress(MainWriter.Writer.Position); var newPage = new FilePage { Address = addrM }; MainWriter.WritePage(newPage); OverflowEndAddress = MainWriter.Writer.Position; OverflowPages = 1; MainWriter.Reset(); Program.MainWrites = 0L; MetaData.Save(); IndexUnit.WriteIndex(); }