Rename

Esiur/Data/KeyList.cs

@@ -0,0 +1,244 @@
+/*
+ 
+Copyright (c) 2017 Ahmed Kh. Zamil
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
+*/
+
+using System;
+using System.IO;
+using System.Collections;
+using System.Security.Cryptography;
+using System.Text;
+using System.Reflection;
+using System.Collections.Generic;
+using System.Linq;
+using System.Linq.Expressions;
+using Esiur.Core;
+
+namespace Esiur.Data
+{
+
+    public class KeyList<KT, T> : IEnumerable<KeyValuePair<KT, T>>
+    {
+        private readonly object syncRoot = new object();
+        private Dictionary<KT, T> dic;
+
+        public delegate void Modified(KT key, T oldValue, T newValue, KeyList<KT, T> sender);
+        public delegate void Added(T value, KeyList<KT, T> sender);
+        public delegate void Removed(KT key, T value, KeyList<KT, T> sender);
+        public delegate void Cleared(KeyList<KT, T> sender);
+
+        public event Modified OnModified;
+        public event Removed OnRemoved;
+        public event Cleared OnCleared;
+        public event Added OnAdd;
+
+        bool removableList;
+
+        public object SyncRoot
+        {
+            get
+            {
+                return syncRoot;
+            }
+        }
+
+        public T Take(KT key)
+        {
+            if (dic.ContainsKey(key))
+            {
+                var v = dic[key];
+                Remove(key);
+                return v;
+            }
+            else
+                return default(T);
+        }
+
+        public void Sort(Func<KeyValuePair<KT, T>, object> keySelector)
+        {
+            dic = dic.OrderBy(keySelector).ToDictionary(x => x.Key, x => x.Value);
+        }
+
+        public T[] ToArray()
+        {
+            var a = new T[Count];
+            dic.Values.CopyTo(a, 0);
+            return a;
+        }
+
+        public void Add(KT key, T value)
+        {
+            lock (syncRoot)
+            {
+                if (removableList)
+                    if (value != null)
+                        ((IDestructible)value).OnDestroy += ItemDestroyed;
+
+                if (dic.ContainsKey(key))
+                {
+                    var oldValue = dic[key];
+                    if (removableList)
+                        if (oldValue != null)
+                            ((IDestructible)oldValue).OnDestroy -= ItemDestroyed;
+                    dic[key] = value;
+                    if (OnModified != null)
+                        OnModified(key, oldValue, value, this);
+                }
+                else
+                {
+                    dic.Add(key, value);
+
+                    if (OnAdd != null)
+                        OnAdd(value, this);
+                }
+            }
+        }
+
+        private void ItemDestroyed(object sender)
+        {
+            RemoveValue((T)sender);
+        }
+
+        public void RemoveValue(T value)
+        {
+            var toRemove = new List<KT>();
+            foreach (var kv in dic)
+                if (kv.Value.Equals(value))
+                    toRemove.Add(kv.Key);
+
+            foreach (var k in toRemove)
+                Remove(k);
+        }
+
+        public T this[KT key]
+        {
+            get
+            {
+                if (dic.ContainsKey(key))
+                    return dic[key];
+                else
+                    return default(T);
+            }
+            set
+            {
+                 Add(key, value);
+            }
+        }
+
+     
+        public IEnumerator<KeyValuePair<KT, T>> GetEnumerator()
+        {
+            return dic.GetEnumerator();
+        }
+
+        IEnumerator IEnumerable.GetEnumerator()
+        {
+            return dic.GetEnumerator();
+        }
+
+
+        public void Clear()
+        {
+            if (removableList)
+                foreach (IDestructible v in dic.Values)
+                    if (v != null)
+                        v.OnDestroy -= ItemDestroyed;
+
+            lock (syncRoot)
+                dic.Clear();
+
+            if (OnCleared != null)
+                OnCleared(this);
+        }
+
+        public Dictionary<KT, T>.KeyCollection Keys
+        {
+            get { return dic.Keys; }
+        }
+
+        public Dictionary<KT, T>.ValueCollection Values
+        {
+            get
+            {
+                return dic.Values;
+            }
+        }
+
+        public void Remove(KT key)
+        {
+            if (!dic.ContainsKey(key))
+                return;
+
+            var value = dic[key];
+
+            if (removableList)
+                if (value != null)
+                    ((IDestructible)value).OnDestroy -= ItemDestroyed;
+
+            lock (syncRoot)
+                dic.Remove(key);
+
+            if (OnRemoved != null)
+                OnRemoved(key, value, this);
+        }
+
+        public object Owner
+        {
+            get;
+            set;
+        }
+
+        public int Count
+        {
+            get { return dic.Count; }
+        }
+        public bool Contains(KT Key)
+        {
+            return dic.ContainsKey(Key);
+        }
+        public bool ContainsKey(KT Key)
+        {
+            return dic.ContainsKey(Key);
+        }
+        public bool ContainsValue(T Value)
+        {
+            return dic.ContainsValue(Value);
+        }
+
+        
+        public KeyList(object owner = null)
+        {
+            #if NETSTANDARD
+                        removableList = (typeof(IDestructible).GetTypeInfo().IsAssignableFrom(typeof(T).GetTypeInfo()));
+#else
+                        removableList = (typeof(IDestructible).IsAssignableFrom(typeof(T)));
+#endif
+
+            this.Owner = owner;
+
+            if (typeof(KT) == typeof(string))
+                dic = (Dictionary<KT, T>)(object)new Dictionary<string, T>(StringComparer.OrdinalIgnoreCase);
+            else
+                dic = new Dictionary<KT, T>();
+        }
+    }
+}