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binary_search_tree_multi.go
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binary_search_tree_multi.go
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// _ _
// __ _____ __ ___ ___ __ _| |_ ___
// \ \ /\ / / _ \/ _` \ \ / / |/ _` | __/ _ \
// \ V V / __/ (_| |\ V /| | (_| | || __/
// \_/\_/ \___|\__,_| \_/ |_|\__,_|\__\___|
//
// Copyright © 2016 - 2024 Weaviate B.V. All rights reserved.
//
// CONTACT: hello@weaviate.io
//
package lsmkv
import (
"bytes"
"github.com/weaviate/weaviate/adapters/repos/db/lsmkv/rbtree"
"github.com/weaviate/weaviate/entities/lsmkv"
)
type binarySearchTreeMulti struct {
root *binarySearchNodeMulti
}
type value struct {
value []byte
tombstone bool
}
func (t *binarySearchTreeMulti) insert(key []byte, values []value) {
if t.root == nil {
t.root = &binarySearchNodeMulti{
key: key,
values: values,
colourIsRed: false, // root node is always black
}
return
}
if newRoot := t.root.insert(key, values); newRoot != nil {
t.root = newRoot
}
t.root.colourIsRed = false // Can be flipped in the process of balancing, but root is always black
}
func (t *binarySearchTreeMulti) get(key []byte) ([]value, error) {
if t.root == nil {
return nil, lsmkv.NotFound
}
return t.root.get(key)
}
// // set Tombstone for the entire entry, i.e. all values for this key
// func (t *binarySearchTreeMulti) setTombstone(key []byte) {
// if t.root == nil {
// // we need to actively insert a node with a tombstone, even if this node is
// // not present because we still need to propagate the delete into the disk
// // segments. It could refer to an entity which was created in a previous
// // segment and is thus unknown to this memtable
// t.root = &binarySearchNodeMulti{
// key: key,
// value: nil,
// tombstone: true,
// }
// }
// t.root.setTombstone(key)
// }
func (t *binarySearchTreeMulti) flattenInOrder() []*binarySearchNodeMulti {
if t.root == nil {
return nil
}
return t.root.flattenInOrder()
}
type binarySearchNodeMulti struct {
key []byte
values []value
left *binarySearchNodeMulti
right *binarySearchNodeMulti
parent *binarySearchNodeMulti
colourIsRed bool
}
func (n *binarySearchNodeMulti) Parent() rbtree.Node {
if n == nil {
return nil
}
return n.parent
}
func (n *binarySearchNodeMulti) SetParent(parent rbtree.Node) {
if n == nil {
addNewSearchNodeMultiReceiver(&n)
}
if parent == nil {
n.parent = nil
return
}
n.parent = parent.(*binarySearchNodeMulti)
}
func (n *binarySearchNodeMulti) Left() rbtree.Node {
if n == nil {
return nil
}
return n.left
}
func (n *binarySearchNodeMulti) SetLeft(left rbtree.Node) {
if n == nil {
addNewSearchNodeMultiReceiver(&n)
}
if left == nil {
n.left = nil
return
}
n.left = left.(*binarySearchNodeMulti)
}
func (n *binarySearchNodeMulti) Right() rbtree.Node {
if n == nil {
return nil
}
return n.right
}
func (n *binarySearchNodeMulti) SetRight(right rbtree.Node) {
if n == nil {
addNewSearchNodeMultiReceiver(&n)
}
if right == nil {
n.right = nil
return
}
n.right = right.(*binarySearchNodeMulti)
}
func (n *binarySearchNodeMulti) IsRed() bool {
if n == nil {
return false
}
return n.colourIsRed
}
func (n *binarySearchNodeMulti) SetRed(isRed bool) {
n.colourIsRed = isRed
}
func (n *binarySearchNodeMulti) IsNil() bool {
return n == nil
}
func addNewSearchNodeMultiReceiver(nodePtr **binarySearchNodeMulti) {
*nodePtr = &binarySearchNodeMulti{}
}
func (n *binarySearchNodeMulti) insert(key []byte, values []value) *binarySearchNodeMulti {
if bytes.Equal(key, n.key) {
n.values = append(n.values, values...)
return nil
}
if bytes.Compare(key, n.key) < 0 {
if n.left != nil {
return n.left.insert(key, values)
} else {
n.left = &binarySearchNodeMulti{
key: key,
values: values,
parent: n,
colourIsRed: true,
}
return binarySearchNodeMultiFromRB(rbtree.Rebalance(n.left))
}
} else {
if n.right != nil {
return n.right.insert(key, values)
} else {
n.right = &binarySearchNodeMulti{
key: key,
values: values,
parent: n,
colourIsRed: true,
}
return binarySearchNodeMultiFromRB(rbtree.Rebalance(n.right))
}
}
}
func (n *binarySearchNodeMulti) get(key []byte) ([]value, error) {
if bytes.Equal(n.key, key) {
return n.values, nil
}
if bytes.Compare(key, n.key) < 0 {
if n.left == nil {
return nil, lsmkv.NotFound
}
return n.left.get(key)
} else {
if n.right == nil {
return nil, lsmkv.NotFound
}
return n.right.get(key)
}
}
func binarySearchNodeMultiFromRB(rbNode rbtree.Node) (bsNode *binarySearchNodeMulti) {
if rbNode == nil {
bsNode = nil
return
}
bsNode = rbNode.(*binarySearchNodeMulti)
return
}
// func (n *binarySearchNodeMulti) setTombstone(key []byte) {
// if bytes.Equal(n.key, key) {
// n.value = nil
// n.tombstone = true
// }
// if bytes.Compare(key, n.key) < 0 {
// if n.left == nil {
// n.left = &binarySearchNodeMulti{
// key: key,
// value: nil,
// tombstone: true,
// }
// return
// }
// n.left.setTombstone(key)
// return
// } else {
// if n.right == nil {
// n.right = &binarySearchNodeMulti{
// key: key,
// value: nil,
// tombstone: true,
// }
// return
// }
// n.right.setTombstone(key)
// return
// }
// }
func (n *binarySearchNodeMulti) flattenInOrder() []*binarySearchNodeMulti {
var left []*binarySearchNodeMulti
var right []*binarySearchNodeMulti
if n.left != nil {
left = n.left.flattenInOrder()
}
if n.right != nil {
right = n.right.flattenInOrder()
}
right = append([]*binarySearchNodeMulti{n}, right...)
return append(left, right...)
}