public void TestPropagatingSplit()
{
var store = new Store();
var btree = new PersistentBTree <IntData>(store.GetNextObjectId(), 3, store);
btree.Insert(1, null);
btree.Insert(2, null);
btree.Insert(3, null);
btree.Insert(4, null);
btree.Insert(5, null);
btree.Insert(6, null);
btree.Insert(7, null);
AssertOrderInList(InOrderTraversal(btree));
Assert.IsNotNull(btree.Root);
Assert.AreEqual(1, btree.Root.Keys.Count);
Assert.AreEqual(4ul, btree.Root.Keys[0].Key);
// root has two child nodes
Assert.AreEqual(2, btree.Root.ChildNodes.Count);
// 1st root child has 1 key
Assert.AreEqual(1, btree.LoadNode(btree.Root.ChildNodes[0]).Keys.Count);
Assert.AreEqual(2ul, btree.LoadNode(btree.Root.ChildNodes[0]).Keys[0].Key);
// 2nd root child has 1 keys
Assert.AreEqual(1, btree.LoadNode(btree.Root.ChildNodes[1]).Keys.Count);
Assert.AreEqual(6ul, btree.LoadNode(btree.Root.ChildNodes[1]).Keys[0].Key);
}
public void TestInsertAfterRootSplit()
{
var store = new Store();
var btree = new PersistentBTree <IntData>(store.GetNextObjectId(), 3, store);
btree.Insert(1, null);
btree.Insert(2, null);
btree.Insert(3, null);
btree.Insert(4, null);
Assert.IsNotNull(btree.Root);
Assert.AreEqual(1, btree.Root.Keys.Count);
Assert.AreEqual(2ul, btree.Root.Keys[0].Key);
// root has two child nodes
Assert.AreEqual(2, btree.Root.ChildNodes.Count);
// left child has 1 key
Assert.AreEqual(1ul, btree.LoadNode(btree.Root.ChildNodes[0]).Keys[0].Key);
Assert.AreEqual(1, btree.LoadNode(btree.Root.ChildNodes[0]).Keys.Count);
// right child has 2 keys
Assert.AreEqual(2, btree.LoadNode(btree.Root.ChildNodes[1]).Keys.Count);
Assert.AreEqual(3ul, btree.LoadNode(btree.Root.ChildNodes[1]).Keys[0].Key);
Assert.AreEqual(4ul, btree.LoadNode(btree.Root.ChildNodes[1]).Keys[1].Key);
}
private static void TraverseNode <T>(PersistentBTree <T> tree, Node <T> node, List <Entry <T> > keys) where T : class, IStorable
{
if (node.ChildNodes.Count == 0)
{
keys.AddRange(node.Keys);
return;
}
for (int i = 0; i < node.Keys.Count; i++)
{
TraverseNode(tree, tree.LoadNode(node.ChildNodes[i]), keys);
keys.Add(node.Keys[i]);
}
TraverseNode(tree, tree.LoadNode(node.ChildNodes.Last()), keys);
}
public void TestRootSplit()
{
var store = new Store();
var btree = new PersistentBTree <IntData>(store.GetNextObjectId(), 3, store);
btree.Insert(1, null);
btree.Insert(2, null);
btree.Insert(3, null);
AssertOrderInList(InOrderTraversal <IntData>(btree));
Assert.IsNotNull(btree.Root);
Assert.AreEqual(1, btree.Root.Keys.Count);
Assert.AreEqual(2ul, btree.Root.Keys[0].Key);
Assert.AreEqual(2, btree.Root.ChildNodes.Count);
Assert.AreEqual(1ul, btree.LoadNode(btree.Root.ChildNodes[0]).Keys[0].Key);
Assert.AreEqual(3ul, btree.LoadNode(btree.Root.ChildNodes[1]).Keys[0].Key);
}
public void TestDeleteInLeafWithRightSiblingBorrow()
{
var store = new Store();
var btree = new PersistentBTree <IntData>(store.GetNextObjectId(), 3, store);
btree.Insert(1, null);
btree.Insert(2, null);
btree.Insert(3, null);
btree.Insert(4, null);
Assert.IsNotNull(btree.Lookup(1));
btree.Delete(1);
Assert.IsNull(btree.Lookup(1));
AssertOrderInList(InOrderTraversal(btree));
Assert.AreEqual(3ul, btree.Root.Keys[0].Key);
Assert.AreEqual(2ul, btree.LoadNode(btree.Root.ChildNodes[0]).Keys[0].Key);
Assert.AreEqual(4ul, btree.LoadNode(btree.Root.ChildNodes[1]).Keys[0].Key);
}
public void TestNonRootSplit()
{
var store = new Store();
var btree = new PersistentBTree <IntData>(store.GetNextObjectId(), 3, store);
btree.Insert(1, null);
btree.Insert(2, null);
btree.Insert(3, null);
btree.Insert(4, null);
btree.Insert(5, null);
AssertOrderInList(InOrderTraversal(btree));
Assert.IsNotNull(btree.Root);
Assert.AreEqual(2, btree.Root.Keys.Count);
Assert.AreEqual(2ul, btree.Root.Keys[0].Key);
Assert.AreEqual(4ul, btree.Root.Keys[1].Key);
// root has three child nodes
Assert.AreEqual(3, btree.Root.ChildNodes.Count);
// root has 2 keys
Assert.AreEqual(2ul, btree.Root.Keys[0].Key);
Assert.AreEqual(4ul, btree.Root.Keys[1].Key);
// left child has 1 key
Assert.AreEqual(1ul, btree.LoadNode(btree.Root.ChildNodes[0]).Keys[0].Key);
Assert.AreEqual(1, btree.LoadNode(btree.Root.ChildNodes[0]).Keys.Count);
// middle child has 1 keys
Assert.AreEqual(1, btree.LoadNode(btree.Root.ChildNodes[1]).Keys.Count);
Assert.AreEqual(3ul, btree.LoadNode(btree.Root.ChildNodes[1]).Keys[0].Key);
// right child has 1 keys
Assert.AreEqual(1, btree.LoadNode(btree.Root.ChildNodes[2]).Keys.Count);
Assert.AreEqual(5ul, btree.LoadNode(btree.Root.ChildNodes[2]).Keys[0].Key);
// check in order traversal
var inorderKeys = InOrderTraversal(btree);
Assert.AreEqual(1ul, inorderKeys.First().Key);
Assert.AreEqual(5ul, inorderKeys.Last().Key);
}