mirror of
https://github.com/Ryujinx/Ryujinx.git
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618 lines
20 KiB
C#
618 lines
20 KiB
C#
using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Diagnostics.CodeAnalysis;
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namespace Ryujinx.Common.Collections
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{
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/// <summary>
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/// Dictionary that provides the ability for O(logN) Lookups for keys that exist in the Dictionary, and O(logN) lookups for keys immediately greater than or less than a specified key.
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/// </summary>
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/// <typeparam name="K">Key</typeparam>
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/// <typeparam name="V">Value</typeparam>
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public class TreeDictionary<K, V> : IntrusiveRedBlackTreeImpl<Node<K, V>>, IDictionary<K, V> where K : IComparable<K>
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{
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#region Public Methods
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/// <summary>
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/// Returns the value of the node whose key is <paramref name="key"/>, or the default value if no such node exists.
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/// </summary>
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/// <param name="key">Key of the node value to get</param>
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/// <returns>Value associated w/ <paramref name="key"/></returns>
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/// <exception cref="ArgumentNullException"><paramref name="key"/> is null</exception>
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public V Get(K key)
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{
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ArgumentNullException.ThrowIfNull(key);
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Node<K, V> node = GetNode(key);
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if (node == null)
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{
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return default;
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}
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return node.Value;
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}
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/// <summary>
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/// Adds a new node into the tree whose key is <paramref name="key"/> key and value is <paramref name="value"/>.
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/// <br></br>
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/// <b>Note:</b> Adding the same key multiple times will cause the value for that key to be overwritten.
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/// </summary>
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/// <param name="key">Key of the node to add</param>
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/// <param name="value">Value of the node to add</param>
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/// <exception cref="ArgumentNullException"><paramref name="key"/> or <paramref name="value"/> are null</exception>
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public void Add(K key, V value)
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{
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ArgumentNullException.ThrowIfNull(key);
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ArgumentNullException.ThrowIfNull(value);
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Insert(key, value);
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}
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/// <summary>
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/// Removes the node whose key is <paramref name="key"/> from the tree.
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/// </summary>
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/// <param name="key">Key of the node to remove</param>
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/// <exception cref="ArgumentNullException"><paramref name="key"/> is null</exception>
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public void Remove(K key)
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{
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ArgumentNullException.ThrowIfNull(key);
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if (Delete(key) != null)
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{
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Count--;
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}
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}
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/// <summary>
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/// Returns the value whose key is equal to or immediately less than <paramref name="key"/>.
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/// </summary>
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/// <param name="key">Key for which to find the floor value of</param>
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/// <returns>Key of node immediately less than <paramref name="key"/></returns>
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/// <exception cref="ArgumentNullException"><paramref name="key"/> is null</exception>
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public K Floor(K key)
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{
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Node<K, V> node = FloorNode(key);
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if (node != null)
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{
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return node.Key;
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}
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return default;
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}
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/// <summary>
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/// Returns the node whose key is equal to or immediately greater than <paramref name="key"/>.
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/// </summary>
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/// <param name="key">Key for which to find the ceiling node of</param>
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/// <returns>Key of node immediately greater than <paramref name="key"/></returns>
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/// <exception cref="ArgumentNullException"><paramref name="key"/> is null</exception>
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public K Ceiling(K key)
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{
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Node<K, V> node = CeilingNode(key);
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if (node != null)
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{
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return node.Key;
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}
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return default;
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}
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/// <summary>
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/// Finds the value whose key is immediately greater than <paramref name="key"/>.
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/// </summary>
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/// <param name="key">Key to find the successor of</param>
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/// <returns>Value</returns>
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public K SuccessorOf(K key)
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{
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Node<K, V> node = GetNode(key);
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if (node != null)
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{
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Node<K, V> successor = SuccessorOf(node);
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return successor != null ? successor.Key : default;
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}
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return default;
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}
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/// <summary>
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/// Finds the value whose key is immediately less than <paramref name="key"/>.
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/// </summary>
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/// <param name="key">Key to find the predecessor of</param>
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/// <returns>Value</returns>
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public K PredecessorOf(K key)
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{
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Node<K, V> node = GetNode(key);
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if (node != null)
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{
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Node<K, V> predecessor = PredecessorOf(node);
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return predecessor != null ? predecessor.Key : default;
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}
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return default;
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}
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/// <summary>
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/// Adds all the nodes in the dictionary as key/value pairs into <paramref name="list"/>.
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/// <br></br>
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/// The key/value pairs will be added in Level Order.
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/// </summary>
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/// <param name="list">List to add the tree pairs into</param>
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public List<KeyValuePair<K, V>> AsLevelOrderList()
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{
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List<KeyValuePair<K, V>> list = new List<KeyValuePair<K, V>>();
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Queue<Node<K, V>> nodes = new Queue<Node<K, V>>();
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if (this.Root != null)
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{
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nodes.Enqueue(this.Root);
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}
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while (nodes.TryDequeue(out Node<K, V> node))
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{
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list.Add(new KeyValuePair<K, V>(node.Key, node.Value));
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if (node.Left != null)
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{
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nodes.Enqueue(node.Left);
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}
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if (node.Right != null)
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{
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nodes.Enqueue(node.Right);
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}
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}
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return list;
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}
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/// <summary>
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/// Adds all the nodes in the dictionary into <paramref name="list"/>.
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/// </summary>
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/// <returns>A list of all KeyValuePairs sorted by Key Order</returns>
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public List<KeyValuePair<K, V>> AsList()
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{
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List<KeyValuePair<K, V>> list = new List<KeyValuePair<K, V>>();
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AddToList(Root, list);
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return list;
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}
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#endregion
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#region Private Methods (BST)
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/// <summary>
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/// Adds all nodes that are children of or contained within <paramref name="node"/> into <paramref name="list"/>, in Key Order.
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/// </summary>
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/// <param name="node">The node to search for nodes within</param>
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/// <param name="list">The list to add node to</param>
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private void AddToList(Node<K, V> node, List<KeyValuePair<K, V>> list)
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{
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if (node == null)
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{
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return;
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}
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AddToList(node.Left, list);
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list.Add(new KeyValuePair<K, V>(node.Key, node.Value));
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AddToList(node.Right, list);
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}
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/// <summary>
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/// Retrieve the node reference whose key is <paramref name="key"/>, or null if no such node exists.
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/// </summary>
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/// <param name="key">Key of the node to get</param>
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/// <returns>Node reference in the tree</returns>
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/// <exception cref="ArgumentNullException"><paramref name="key"/> is null</exception>
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private Node<K, V> GetNode(K key)
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{
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ArgumentNullException.ThrowIfNull(key);
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Node<K, V> node = Root;
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while (node != null)
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{
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int cmp = key.CompareTo(node.Key);
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if (cmp < 0)
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{
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node = node.Left;
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}
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else if (cmp > 0)
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{
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node = node.Right;
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}
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else
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{
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return node;
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}
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}
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return null;
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}
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/// <summary>
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/// Inserts a new node into the tree whose key is <paramref name="key"/> and value is <paramref name="value"/>.
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/// <br></br>
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/// Adding the same key multiple times will overwrite the previous value.
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/// </summary>
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/// <param name="key">Key of the node to insert</param>
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/// <param name="value">Value of the node to insert</param>
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private void Insert(K key, V value)
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{
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Node<K, V> newNode = BSTInsert(key, value);
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RestoreBalanceAfterInsertion(newNode);
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}
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/// <summary>
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/// Insertion Mechanism for a Binary Search Tree (BST).
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/// <br></br>
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/// Iterates the tree starting from the root and inserts a new node where all children in the left subtree are less than <paramref name="key"/>, and all children in the right subtree are greater than <paramref name="key"/>.
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/// <br></br>
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/// <b>Note: </b> If a node whose key is <paramref name="key"/> already exists, it's value will be overwritten.
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/// </summary>
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/// <param name="key">Key of the node to insert</param>
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/// <param name="value">Value of the node to insert</param>
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/// <returns>The inserted Node</returns>
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private Node<K, V> BSTInsert(K key, V value)
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{
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Node<K, V> parent = null;
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Node<K, V> node = Root;
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while (node != null)
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{
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parent = node;
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int cmp = key.CompareTo(node.Key);
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if (cmp < 0)
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{
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node = node.Left;
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}
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else if (cmp > 0)
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{
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node = node.Right;
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}
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else
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{
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node.Value = value;
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return node;
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}
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}
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Node<K, V> newNode = new Node<K, V>(key, value, parent);
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if (newNode.Parent == null)
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{
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Root = newNode;
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}
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else if (key.CompareTo(parent.Key) < 0)
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{
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parent.Left = newNode;
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}
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else
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{
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parent.Right = newNode;
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}
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Count++;
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return newNode;
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}
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/// <summary>
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/// Removes <paramref name="key"/> from the dictionary, if it exists.
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/// </summary>
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/// <param name="key">Key of the node to delete</param>
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/// <returns>The deleted Node</returns>
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private Node<K, V> Delete(K key)
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{
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// O(1) Retrieval
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Node<K, V> nodeToDelete = GetNode(key);
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if (nodeToDelete == null) return null;
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Node<K, V> replacementNode;
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if (LeftOf(nodeToDelete) == null || RightOf(nodeToDelete) == null)
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{
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replacementNode = nodeToDelete;
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}
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else
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{
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replacementNode = PredecessorOf(nodeToDelete);
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}
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Node<K, V> tmp = LeftOf(replacementNode) ?? RightOf(replacementNode);
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if (tmp != null)
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{
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tmp.Parent = ParentOf(replacementNode);
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}
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if (ParentOf(replacementNode) == null)
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{
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Root = tmp;
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}
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else if (replacementNode == LeftOf(ParentOf(replacementNode)))
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{
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ParentOf(replacementNode).Left = tmp;
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}
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else
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{
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ParentOf(replacementNode).Right = tmp;
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}
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if (replacementNode != nodeToDelete)
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{
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nodeToDelete.Key = replacementNode.Key;
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nodeToDelete.Value = replacementNode.Value;
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}
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if (tmp != null && ColorOf(replacementNode) == Black)
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{
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RestoreBalanceAfterRemoval(tmp);
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}
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return replacementNode;
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}
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/// <summary>
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/// Returns the node whose key immediately less than or equal to <paramref name="key"/>.
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/// </summary>
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/// <param name="key">Key for which to find the floor node of</param>
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/// <returns>Node whose key is immediately less than or equal to <paramref name="key"/>, or null if no such node is found.</returns>
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/// <exception cref="ArgumentNullException"><paramref name="key"/> is null</exception>
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private Node<K, V> FloorNode(K key)
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{
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ArgumentNullException.ThrowIfNull(key);
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Node<K, V> tmp = Root;
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while (tmp != null)
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{
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int cmp = key.CompareTo(tmp.Key);
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if (cmp > 0)
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{
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if (tmp.Right != null)
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{
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tmp = tmp.Right;
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}
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else
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{
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return tmp;
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}
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}
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else if (cmp < 0)
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{
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if (tmp.Left != null)
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{
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tmp = tmp.Left;
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}
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else
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{
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Node<K, V> parent = tmp.Parent;
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Node<K, V> ptr = tmp;
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while (parent != null && ptr == parent.Left)
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{
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ptr = parent;
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parent = parent.Parent;
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}
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return parent;
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}
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}
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else
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{
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return tmp;
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}
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}
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return null;
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}
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/// <summary>
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/// Returns the node whose key is immediately greater than or equal to than <paramref name="key"/>.
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/// </summary>
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/// <param name="key">Key for which to find the ceiling node of</param>
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/// <returns>Node whose key is immediately greater than or equal to <paramref name="key"/>, or null if no such node is found.</returns>
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/// <exception cref="ArgumentNullException"><paramref name="key"/> is null</exception>
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private Node<K, V> CeilingNode(K key)
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{
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ArgumentNullException.ThrowIfNull(key);
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Node<K, V> tmp = Root;
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while (tmp != null)
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{
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int cmp = key.CompareTo(tmp.Key);
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if (cmp < 0)
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{
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if (tmp.Left != null)
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{
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tmp = tmp.Left;
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}
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else
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{
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return tmp;
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}
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}
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else if (cmp > 0)
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{
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if (tmp.Right != null)
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{
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tmp = tmp.Right;
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}
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else
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{
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Node<K, V> parent = tmp.Parent;
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Node<K, V> ptr = tmp;
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while (parent != null && ptr == parent.Right)
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{
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ptr = parent;
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parent = parent.Parent;
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}
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return parent;
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}
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}
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else
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{
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return tmp;
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}
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}
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return null;
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}
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#endregion
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#region Interface Implementations
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// Method descriptions are not provided as they are already included as part of the interface.
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public bool ContainsKey(K key)
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{
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ArgumentNullException.ThrowIfNull(key);
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return GetNode(key) != null;
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}
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bool IDictionary<K, V>.Remove(K key)
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{
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int count = Count;
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Remove(key);
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return count > Count;
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}
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public bool TryGetValue(K key, [MaybeNullWhen(false)] out V value)
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{
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ArgumentNullException.ThrowIfNull(key);
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Node<K, V> node = GetNode(key);
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value = node != null ? node.Value : default;
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return node != null;
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}
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public void Add(KeyValuePair<K, V> item)
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{
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ArgumentNullException.ThrowIfNull(item.Key);
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Add(item.Key, item.Value);
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}
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public bool Contains(KeyValuePair<K, V> item)
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{
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if (item.Key == null)
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{
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return false;
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}
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Node<K, V> node = GetNode(item.Key);
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if (node != null)
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{
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return node.Key.Equals(item.Key) && node.Value.Equals(item.Value);
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}
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return false;
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}
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public void CopyTo(KeyValuePair<K, V>[] array, int arrayIndex)
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{
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if (arrayIndex < 0 || array.Length - arrayIndex < this.Count)
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{
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throw new ArgumentOutOfRangeException(nameof(arrayIndex));
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}
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SortedList<K, V> list = GetKeyValues();
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int offset = 0;
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for (int i = arrayIndex; i < array.Length && offset < list.Count; i++)
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{
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array[i] = new KeyValuePair<K, V>(list.Keys[i], list.Values[i]);
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offset++;
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}
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}
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public bool Remove(KeyValuePair<K, V> item)
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{
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Node<K, V> node = GetNode(item.Key);
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if (node == null)
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{
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return false;
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}
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if (node.Value.Equals(item.Value))
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{
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int count = Count;
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Remove(item.Key);
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return count > Count;
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}
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return false;
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}
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public IEnumerator<KeyValuePair<K, V>> GetEnumerator()
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{
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return GetKeyValues().GetEnumerator();
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}
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IEnumerator IEnumerable.GetEnumerator()
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{
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return GetKeyValues().GetEnumerator();
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}
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public ICollection<K> Keys => GetKeyValues().Keys;
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public ICollection<V> Values => GetKeyValues().Values;
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public bool IsReadOnly => false;
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public V this[K key]
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{
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get => Get(key);
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set => Add(key, value);
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}
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#endregion
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#region Private Interface Helper Methods
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/// <summary>
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/// Returns a sorted list of all the node keys / values in the tree.
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/// </summary>
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/// <returns>List of node keys</returns>
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private SortedList<K, V> GetKeyValues()
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{
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SortedList<K, V> set = new SortedList<K, V>();
|
|
Queue<Node<K, V>> queue = new Queue<Node<K, V>>();
|
|
if (Root != null)
|
|
{
|
|
queue.Enqueue(Root);
|
|
}
|
|
|
|
while (queue.TryDequeue(out Node<K, V> node))
|
|
{
|
|
set.Add(node.Key, node.Value);
|
|
if (null != node.Left)
|
|
{
|
|
queue.Enqueue(node.Left);
|
|
}
|
|
if (null != node.Right)
|
|
{
|
|
queue.Enqueue(node.Right);
|
|
}
|
|
}
|
|
|
|
return set;
|
|
}
|
|
|
|
#endregion
|
|
}
|
|
|
|
/// <summary>
|
|
/// Represents a node in the TreeDictionary which contains a key and value of generic type K and V, respectively.
|
|
/// </summary>
|
|
/// <typeparam name="K">Key of the node</typeparam>
|
|
/// <typeparam name="V">Value of the node</typeparam>
|
|
public class Node<K, V> : IntrusiveRedBlackTreeNode<Node<K, V>> where K : IComparable<K>
|
|
{
|
|
internal K Key;
|
|
internal V Value;
|
|
|
|
internal Node(K key, V value, Node<K, V> parent)
|
|
{
|
|
Key = key;
|
|
Value = value;
|
|
Parent = parent;
|
|
}
|
|
}
|
|
}
|