/// <summary>
/// Adds to SST if required.
/// </summary>
private void AddToSSTIfRequired()
{
if (book != null)
{
int index = book.AddSSTString(str);
record.SSTIndex = (index);
//The act of Adding the string to the SST record may have meant that
//a extsing string was returned for the index, so update our local version
str = book.GetSSTString(index);
}
}