/// <summary>
/// decodes the contexts at the current position </summary>
protected internal virtual ISet <BytesRef> DecodeContexts(BytesRef scratch, ByteArrayDataInput tmpInput)
{
tmpInput.Reset(scratch.Bytes);
tmpInput.SkipBytes(scratch.Length - 2); //skip to context set size
ushort ctxSetSize = (ushort)tmpInput.ReadInt16();
scratch.Length -= 2;
var contextSet = new JCG.HashSet <BytesRef>();
for (ushort i = 0; i < ctxSetSize; i++)
{
tmpInput.Position = scratch.Length - 2;
ushort curContextLength = (ushort)tmpInput.ReadInt16();
scratch.Length -= 2;
tmpInput.Position = scratch.Length - curContextLength;
BytesRef contextSpare = new BytesRef(curContextLength);
tmpInput.ReadBytes(contextSpare.Bytes, 0, curContextLength);
contextSpare.Length = curContextLength;
contextSet.Add(contextSpare);
scratch.Length -= curContextLength;
}
// LUCENENET TODO: We are writing the data forward.
// Not sure exactly why, but when we read it back it
// is reversed. So, we need to fix that before returning the result.
// If the underlying problem is found and fixed, then this line can just be
// return contextSet;
return(new JCG.HashSet <BytesRef>(contextSet.Reverse()));
}
