Andrew Zambazos
130 lines
3.2 KiB
JavaScript
130 lines
3.2 KiB
JavaScript
/*
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* Copyright (C) 2016 Devin Rousso <webkit@devinrousso.com>. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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WI.Collection = class Collection extends WI.Object
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{
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constructor(items = [])
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{
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super();
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this._items = new Set;
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for (let item of items)
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this.add(item);
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}
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// Public
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get size()
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{
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return this._items.size;
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}
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get displayName()
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{
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throw WI.NotImplementedError.subclassMustOverride();
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}
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objectIsRequiredType(object)
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{
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throw WI.NotImplementedError.subclassMustOverride();
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}
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add(item)
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{
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let isValidType = this.objectIsRequiredType(item);
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console.assert(isValidType);
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if (!isValidType)
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return;
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console.assert(!this._items.has(item));
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this._items.add(item);
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this.itemAdded(item);
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this.dispatchEventToListeners(WI.Collection.Event.ItemAdded, {item});
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}
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remove(item)
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{
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let wasRemoved = this._items.delete(item);
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console.assert(wasRemoved);
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this.itemRemoved(item);
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this.dispatchEventToListeners(WI.Collection.Event.ItemRemoved, {item});
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}
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has(...args)
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{
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return this._items.has(...args);
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}
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clear()
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{
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let items = new Set(this._items);
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this._items.clear();
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this.itemsCleared(items);
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for (let item of items)
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this.dispatchEventToListeners(WI.Collection.Event.ItemRemoved, {item});
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}
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toJSON()
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{
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return Array.from(this);
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}
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[Symbol.iterator]()
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{
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return this._items[Symbol.iterator]();
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}
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// Protected
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itemAdded(item)
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{
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// Implemented by subclasses.
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}
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itemRemoved(item)
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{
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// Implemented by subclasses.
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}
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itemsCleared(items)
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{
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// Implemented by subclasses.
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}
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};
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WI.Collection.Event = {
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ItemAdded: "collection-item-added",
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ItemRemoved: "collection-item-removed",
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};
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