private void PrepareFile(bool append)
{
if (append)
{
if (!Stream.CanSeek)
{
throw new IOException("destination stream must be seekable for append operations.");
}
ValidateFile();
Thrift.FileMetaData fileMeta = ReadMetadata();
_footer = new ThriftFooter(fileMeta);
ValidateSchemasCompatible(_footer, _schema);
GoBeforeFooter();
}
else
{
if (_footer == null)
{
_footer = new ThriftFooter(_schema, 0 /* todo: don't forget to set the total row count at the end!!! */);
//file starts with magic
WriteMagic();
}
else
{
ValidateSchemasCompatible(_footer, _schema);
_footer.Add(0 /* todo: don't forget to set the total row count at the end!!! */);
}
}
}
void PrepareFile(DataSet ds, bool append)
{
if (append)
{
if (!Stream.CanSeek)
{
throw new IOException("destination stream must be seekable for append operations.");
}
ValidateFile();
Thrift.FileMetaData fileMeta = ReadMetadata();
_footer = new ThriftFooter(fileMeta);
ValidateSchemasCompatible(_footer, ds);
GoBeforeFooter();
}
else
{
if (_footer == null)
{
_footer = new ThriftFooter(ds.Schema, ds.RowCount);
//file starts with magic
WriteMagic();
}
else
{
ValidateSchemasCompatible(_footer, ds);
_footer.Add(ds.RowCount);
}
}
}