public void InsertRecord(params object[] fields)
{
long insertLocation;
//Find available spot to place record....
if (_fileHeader.BlocksInFile == 0)
{
var block = RecordBlock.CreateNew(_stream, _schema, 0);
_fileHeader.BlocksInFile++;
WriteFileHeader();
insertLocation = block.Insert(fields);
}
else
{
var lastBlock = RecordBlock.LoadFromStream(_stream, _schema, _fileHeader.BlocksInFile - 1);
if (lastBlock.BlockHeader.FreeBytes > _schema.GetRecordSize())
{
insertLocation = lastBlock.Insert(fields);
}
else
{
var newBlock = RecordBlock.CreateNew(_stream, _schema, _fileHeader.BlocksInFile);
insertLocation = newBlock.Insert(fields);
_fileHeader.BlocksInFile++;
WriteFileHeader();
}
}
_indexManager.AddRecord(fields, insertLocation, _schema);
}
public Block(FileStream stream, DataStructure schema, long index)
{
_stream = stream;
_schema = schema;
this.Index = index;
_stream.SeekToBlockHeader(index);
this.BlockHeader = _stream.ReadBlockHeader();
_fieldTypeFactory = new Creation.FieldTypeFactory();
_valueByteSize = _schema.GetRecordSize();
}
/// <summary>
/// Inserts the record returns the location at which it was inserted.
/// </summary>
/// <param name="fields"></param>
/// <returns></returns>
public long Insert(params object[] fields)
{
_stream.SeekToRecord(_schema, BlockHeader.BlockSequence, BlockHeader.RecordCount);
IDataFieldType[] fieldTypes = new IDataFieldType[fields.Length];
for (int i = 0; i < fields.Length; i++)
{
var fieldDefinition = _schema.Fields[i];
fieldTypes[i] = _fieldTypeFactory.GetFieldType(fieldDefinition.DataType);
}
for (int i = 0; i < fields.Length; i++)
{
var field = fields[i];
if (!fieldTypes[i].IsValid(field))
{
//Maybe i should collect all the failures and return them at once.
throw new Exception();
}
}
long recordLocation = _stream.Position;
//Only if there are no failures, we start writing to the file
for (int i = 0; i < fields.Length; i++)
{
var field = fields[i];
fieldTypes[i].WriteToStream(_stream, field);
}
BlockHeader.FreeBytes -= _schema.GetRecordSize();
BlockHeader.RecordCount++;
_stream.Flush();
this.WriteBlockHeader();
return(recordLocation);
}
public static void SeekToRecord(this Stream fileStream, DataStructure schema, long blockIndex, long recordIndex)
{
var blockContents = ((Lengths.BlockLength + Lengths.BlockHeaderLength) * (blockIndex + 1)) + Lengths.FileHeaderLength + Lengths.BlockHeaderLength;
fileStream.Position = blockContents + (recordIndex * schema.GetRecordSize());
}