package

lib/src/Data/KeyList.dart

@@ -0,0 +1,156 @@
+/*
+ 
+Copyright (c) 2019 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.
+
+*/
+import '../Core/IEventHandler.dart';
+import '../Core/IDestructible.dart';
+
+import 'dart:collection';
+import 'Codec.dart';
+
+class KeyList<KT, T> extends IEventHandler with MapMixin<KT, T>
+{
+
+    dynamic owner;
+    
+    Map<KT, T> _map = new Map<KT, T>();
+    
+    Iterator<KT>  get iterator => _map.keys.iterator;
+
+    Iterable<KT> get keys => _map.keys;
+    Iterable<T> get values => _map.values;
+    
+
+    operator[](index) => _map[index];
+
+    operator []= (index, value) => add(index, value);
+            
+
+    at(int index) => _map.values.elementAt(index);
+
+    
+    bool _removableList;
+
+
+    T take(KT key)
+    {
+        if (_map.containsKey(key))
+        {
+            var v = _map[key];
+            remove(key);
+            return v;
+        }
+        else
+            return null;
+    }
+
+    
+    List<T> toArray() => _map.values.toList();
+
+    void add(KT key, T value)
+    {
+        if (_removableList)
+            if (value != null)
+                (value as IDestructible).on("destroy", _itemDestroyed);
+
+        if (_map.containsKey(key))
+        {
+            var oldValue = _map[key];
+            if (_removableList)
+                if (oldValue != null)
+                    (oldValue as IDestructible).off("destroy", _itemDestroyed);
+
+            _map[key] = value;
+
+            emitArgs("modified", [key, oldValue, value, this]);
+        }
+        else
+        {
+            _map[key] = value;
+
+            emitArgs("add", [value, this]);
+
+        }
+    
+    }
+
+    _itemDestroyed(T sender)
+    {
+        removeValue(sender);
+    }
+
+    removeValue(T value)
+    {
+        var toRemove = new List<KT>();
+        for (var k in _map.keys)
+            if (_map[k] == value)
+                toRemove.add(k);
+
+        for (var k in toRemove)
+            remove(k);
+    }
+
+    clear()
+    {
+        if (_removableList)
+            for (var v in _map.values)
+                (v as IDestructible)?.off("destroy", _itemDestroyed);
+                
+        _map.clear();
+
+        emitArgs("cleared", [this]);
+        
+    }
+
+
+
+    T remove(key)
+    {
+        if (!_map.containsKey(key))
+            return null;
+
+        var value = _map[key];
+
+        if (_removableList)
+           (value as IDestructible)?.off("destroy", _itemDestroyed);
+
+        
+        _map.remove(key);
+
+        emitArgs("removed", [key, value, this]);
+
+        return value;
+    }
+
+    
+
+    int get count => _map.length;
+    
+    bool contains(KT key) => _map.containsKey(key);
+
+    
+    KeyList([owner = null])
+    {
+        _removableList = Codec.implementsInterface<T, IDestructible>();
+        this.owner = owner;
+    }
+}