public void SplitLeaf(Key key, long position)
{
UnfreezeStack();
TreeLeaf sourceLeaf = CurrentLeaf;
int splitPoint = LeafOffset;
// The amount of data we are copying from the current key.
int amount = sourceLeaf.Length - splitPoint;
// Create a new empty node
TreeLeaf emptyLeaf = CreateLeaf(key);
emptyLeaf.SetLength(amount);
// Copy the data at the end of the leaf into a buffer
byte[] buf = new byte[amount];
sourceLeaf.Read(splitPoint, buf, 0, amount);
// And write it out to the new leaf
emptyLeaf.Write(0, buf, 0, amount);
// Set the new size of the node
sourceLeaf.SetLength(splitPoint);
// Update the stack properties
UpdateStackProperties(-amount);
// And insert the new leaf after
InsertLeaf(key, emptyLeaf, false);
}
public long Create()
{
if (initialized)
{
throw new InvalidOperationException("This tree store is already initialized.");
}
// Temporary node heap for creating a starting database
TreeNodeHeap nodeHeap = new TreeNodeHeap(17, 4 * 1024 * 1024);
// Write a root node to the store,
// Create an empty head node
TreeLeaf headLeaf = nodeHeap.CreateLeaf(null, Key.Head, 256);
// Insert a tree identification pattern
headLeaf.Write(0, new byte[] { 1, 1, 1, 1 }, 0, 4);
// Create an empty tail node
TreeLeaf tailLeaf = nodeHeap.CreateLeaf(null, Key.Tail, 256);
// Insert a tree identification pattern
tailLeaf.Write(0, new byte[] { 1, 1, 1, 1 }, 0, 4);
// The write sequence,
TreeWrite seq = new TreeWrite();
seq.NodeWrite(headLeaf);
seq.NodeWrite(tailLeaf);
IList <NodeId> refs = Persist(seq);
// Create a branch,
TreeBranch rootBranch = nodeHeap.CreateBranch(null, MaxBranchSize);
rootBranch.Set(refs[0], 4, Key.Tail, refs[1], 4);
seq = new TreeWrite();
seq.NodeWrite(rootBranch);
refs = Persist(seq);
// The written root node reference,
NodeId rootId = refs[0];
// Delete the head and tail leaf, and the root branch
nodeHeap.Delete(headLeaf.Id);
nodeHeap.Delete(tailLeaf.Id);
nodeHeap.Delete(rootBranch.Id);
// Write this version info to the store,
long versionId = WriteSingleVersionInfo(1, rootId, new List <NodeId>(0));
// Make a first version
VersionInfo versionInfo = new VersionInfo(1, rootId, versionId);
versions.Add(versionInfo);
// Flush this to the version list
IAreaWriter versionList = nodeStore.CreateArea(64);
versionList.WriteInt4(0x01433);
versionList.WriteInt4(1);
versionList.WriteInt8(versionId);
versionList.Finish();
// Get the versions id
long versionListId = versionList.Id;
// The final header
IAreaWriter header = nodeStore.CreateArea(64);
header.WriteInt4(0x09391); // The magic value,
header.WriteInt4(1); // The version
header.WriteInt8(versionListId);
header.Finish();
// Set up the internal variables,
headerId = header.Id;
initialized = true;
// And return the header reference
return(headerId);
}
