public void Create(ReadingCollectionDto dto)
{
SeekEnd();
// The collection must never grow past max size
this.maxSize = dto.MaxReadings;
// Write maximum size
Writer.Write(this.maxSize);
// Record the position of the current size field
this.currentSizePosition = Writer.BaseStream.Position;
// Write current size
Writer.Write(this.currentSize);
ReadingDto emptyReadingDto = new ReadingDto();
// Create an empty reading DTO
emptyReadingDto.Empty = true;
emptyReadingDto.Value = 0D;
emptyReadingDto.Timestamp = DateTime.Now;
// Create empty readings in the database
for (int i = 0; i < this.maxSize; i++)
{
BinaryFileReadingDao emptyReadingDao = new BinaryFileReadingDao(archive);
emptyReadingDao.Create(emptyReadingDto);
this.unallocatedReadings.Add(emptyReadingDao);
}
}
public ReadingCollectionDto Read()
{
ReadingCollectionDto dto = new ReadingCollectionDto();
dto.Dao = this;
SeekPosition();
// Maximum size
dto.MaxReadings = this.maxSize = Reader.ReadInt32();
// Record the position of the current size field
this.currentSizePosition = Reader.BaseStream.Position;
// Current size
this.currentSize = Reader.ReadInt32();
int counter = 0;
// Read all of the non-empty readings
for (; counter < this.currentSize; counter++)
{
BinaryFileReadingDao newReadingDao = new BinaryFileReadingDao(archive);
ReadingDto newReadingDto = newReadingDao.Read();
newReadingDto.Dao = (IReadingDao)newReadingDao;
this.readings.Add(newReadingDao);
dto.Add(newReadingDto);
}
// Read all of the empty readings
for (; counter < this.maxSize; counter++)
{
BinaryFileReadingDao newReadingDao = new BinaryFileReadingDao(archive);
ReadingDto newReadingDto = newReadingDao.Read();
Debug.Assert(newReadingDto.Empty);
newReadingDto.Dao = (IReadingDao)newReadingDao;
this.unallocatedReadings.Add(newReadingDao);
}
return(dto);
}
