public CollectionIndex(BufferReader reader)
{
this.Slot = reader.ReadByte();
this.IndexType = reader.ReadByte();
this.Name = reader.ReadCString();
this.Expression = reader.ReadCString();
this.Unique = reader.ReadBoolean();
this.Head = reader.ReadPageAddress(); // 5
this.Tail = reader.ReadPageAddress(); // 5
this.MaxLevel = reader.ReadByte(); // 1
this.FreeIndexPageList = reader.ReadUInt32(); // 4
this.BsonExpr = BsonExpression.Create(this.Expression);
}
public CollectionPage(PageBuffer buffer)
: base(buffer)
{
if (this.PageType != PageType.Collection)
{
throw new LiteException(0, $"Invalid CollectionPage buffer on {PageID}");
}
// create new buffer area to store BsonDocument indexes
var area = _buffer.Slice(PAGE_HEADER_SIZE, PAGE_SIZE - PAGE_HEADER_SIZE);
using (var r = new BufferReader(new[] { area }, false))
{
// read position for FreeDataPage and FreeIndexPage
for (var i = 0; i < PAGE_FREE_LIST_SLOTS; i++)
{
this.FreeDataPageID[i] = r.ReadUInt32();
this.FreeIndexPageID[i] = r.ReadUInt32();
}
// read create/last analyzed (16 bytes)
this.CreationTime = r.ReadDateTime();
this.LastAnalyzed = r.ReadDateTime();
// skip reserved area
r.Skip(P_INDEXES - r.Position);
// read indexes count (max 256 indexes per collection)
var count = r.ReadByte(); // 1 byte
for (var i = 0; i < count; i++)
{
var index = new CollectionIndex(
slot: r.ReadByte(),
name: r.ReadCString(),
expr: r.ReadCString(),
unique: r.ReadBoolean())
{
Head = r.ReadPageAddress(), // 5
Tail = r.ReadPageAddress(), // 5
MaxLevel = r.ReadByte(), // 1
KeyCount = r.ReadUInt32(), // 4
UniqueKeyCount = r.ReadUInt32() // 4
};
_indexes[index.Name] = index;
}
}
}
