2 * Copyright (C) 2016 Devin Rousso <webkit@devinrousso.com>. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
26 WI.Collection = class Collection extends WI.Object
28 constructor(items = [])
32 this._items = new Set;
34 for (let item of items)
40 get items() { return this._items; }
44 throw WI.NotImplementedError.subclassMustOverride();
47 objectIsRequiredType(object)
49 throw WI.NotImplementedError.subclassMustOverride();
54 let isValidType = this.objectIsRequiredType(item);
55 console.assert(isValidType);
59 console.assert(!this._items.has(item));
60 this._items.add(item);
64 this.dispatchEventToListeners(WI.Collection.Event.ItemAdded, {item});
69 let wasRemoved = this._items.delete(item);
70 console.assert(wasRemoved);
72 this.itemRemoved(item);
74 this.dispatchEventToListeners(WI.Collection.Event.ItemRemoved, {item});
79 let items = new Set(this._items);
83 this.itemsCleared(items);
85 for (let item of items)
86 this.dispatchEventToListeners(WI.Collection.Event.ItemRemoved, {item});
91 return Array.from(this._items);
96 return this.toArray();
103 // Implemented by subclasses.
108 // Implemented by subclasses.
113 // Implemented by subclasses.
117 WI.Collection.Event = {
118 ItemAdded: "collection-item-added",
119 ItemRemoved: "collection-item-removed",