/// <summary>
/// Read index node from page segment (lazy-load)
/// </summary>
public IndexNode(IndexPage page, byte index, BufferSlice segment)
{
_page = page;
_segment = segment;
this.Position = new PageAddress(page.PageID, index);
this.Slot = segment.ReadByte(P_SLOT);
this.Level = segment.ReadByte(P_LEVEL);
this.DataBlock = segment.ReadPageAddress(P_DATA_BLOCK);
this.NextNode = segment.ReadPageAddress(P_NEXT_NODE);
this.Next = new PageAddress[this.Level];
this.Prev = new PageAddress[this.Level];
for (var i = 0; i < this.Level; i++)
{
this.Prev[i] = segment.ReadPageAddress(P_PREV_NEXT + (i * PageAddress.SIZE * 2));
this.Next[i] = segment.ReadPageAddress(P_PREV_NEXT + (i * PageAddress.SIZE * 2) + PageAddress.SIZE);
}
this.Key = segment.ReadIndexKey(P_KEY);
}
/// <summary>
/// Read new DataBlock from filled page segment
/// </summary>
public DataBlock(DataPage page, byte index, BufferSlice segment)
{
_page = page;
_segment = segment;
this.Position = new PageAddress(page.PageID, index);
// byte 00: Extend
this.Extend = segment.ReadBool(P_EXTEND);
// byte 01-05: NextBlock (PageID, Index)
this.NextBlock = segment.ReadPageAddress(P_NEXT_BLOCK);
// byte 06-EOL: Buffer
this.Buffer = segment.Slice(P_BUFFER, segment.Count - P_BUFFER);
}