gecko/dom/settings/SettingsQueue.jsm
Kyle Huey 1482122303 Bug 798491: Add an option to stick all chrome JSMs/JS components in the same compartment. r=mrbkap,philikon
--HG--
extra : rebase_source : 98337b6a8c07d05e8c961a452dd05a7d75c3c60b
2012-10-31 09:13:28 -07:00

31 lines
795 B
JavaScript

/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
this.EXPORTED_SYMBOLS = ["Queue"];
this.Queue = function Queue() {
this._queue = [];
this._index = 0;
}
Queue.prototype = {
getLength: function() { return (this._queue.length - this._index); },
isEmpty: function() { return (this._queue.length == 0); },
enqueue: function(item) { this._queue.push(item); },
dequeue: function() {
if(this.isEmpty())
return undefined;
var item = this._queue[this._index];
if (++this._index * 2 >= this._queue.length){
this._queue = this._queue.slice(this._index);
this._index = 0;
}
return item;
}
}