/// <summary>
/// Create new index node and persist into page segment
/// </summary>
public IndexNode(IndexPage page, byte index, BufferSlice segment, byte slot, byte level, BsonValue key, PageAddress dataBlock)
{
_page = page;
_segment = segment;
this.Position = new PageAddress(page.PageID, index);
this.Slot = slot;
this.Level = level;
this.Key = key;
this.DataBlock = dataBlock;
this.NextNode = PageAddress.Empty;
this.Next = new PageAddress[level];
this.Prev = new PageAddress[level];
for (var i = 0; i < level; i++)
{
this.SetPrev((byte)i, PageAddress.Empty);
this.SetNext((byte)i, PageAddress.Empty);
}
// persist in buffer read only data
segment[P_SLOT] = slot;
segment[P_LEVEL] = level;
segment.Write(dataBlock, P_DATA_BLOCK);
segment.WriteIndexKey(key, P_KEY);
// prevNode/nextNode must be defined as Empty
segment.Write(this.NextNode, P_NEXT_NODE);
page.IsDirty = true;
}
/// <summary>
/// Update NextNode pointer (update in buffer too). Also, set page as dirty
/// </summary>
public void SetNextNode(PageAddress value)
{
this.NextNode = value;
_segment.Write(value, P_NEXT_NODE);
_page.IsDirty = true;
}
public void Insert(IEnumerable <KeyValuePair <BsonValue, PageAddress> > items, int order, BufferSlice buffer)
{
var query = order == Query.Ascending ?
items.OrderBy(x => x.Key, _collation) : items.OrderByDescending(x => x.Key, _collation);
var offset = 0;
foreach (var item in query)
{
buffer.WriteIndexKey(item.Key, offset);
var keyLength = IndexNode.GetKeyLength(item.Key, false);
if (keyLength > MAX_INDEX_KEY_LENGTH)
{
throw LiteException.InvalidIndexKey($"Sort key must be less than {MAX_INDEX_KEY_LENGTH} bytes.");
}
offset += keyLength;
buffer.Write(item.Value, offset);
offset += PageAddress.SIZE;
_remaining++;
}
_count = _remaining;
}
public void SetNextBlock(PageAddress nextBlock)
{
this.NextBlock = nextBlock;
// update segment buffer with NextBlock (uint + byte)
_segment.Write(nextBlock, P_NEXT_BLOCK);
_page.IsDirty = true;
}
/// <summary>
/// Create new DataBlock and fill into buffer
/// </summary>
public DataBlock(DataPage page, byte index, BufferSlice segment, bool extend, PageAddress nextBlock)
{
_page = page;
_segment = segment;
this.Position = new PageAddress(page.PageID, index);
this.NextBlock = nextBlock;
this.Extend = extend;
// byte 00: Data Index
segment.Write(extend, P_EXTEND);
// byte 01-05 (can be updated in "UpdateNextBlock")
segment.Write(nextBlock, P_NEXT_BLOCK);
// byte 06-EOL: Buffer
this.Buffer = segment.Slice(P_BUFFER, segment.Count - P_BUFFER);
page.IsDirty = true;
}
public void Insert(IEnumerable <KeyValuePair <BsonValue, PageAddress> > items, int order, BufferSlice buffer)
{
var query = order == Query.Ascending ?
items.OrderBy(x => x.Key) : items.OrderByDescending(x => x.Key);
var offset = 0;
foreach (var item in query)
{
buffer.WriteIndexKey(item.Key, offset);
offset += GetKeyLength(item.Key);
buffer.Write(item.Value, offset);
offset += PageAddress.SIZE;
_remaining++;
}
_count = _remaining;
}
