!(function () {
    BI.Queue = function (capacity) {
        this.capacity = capacity;
        this.array = [];
    };
    BI.Queue.prototype = {
        constructor: BI.Queue,

        contains: function (v) {
            return BI.contains(this.array, v);
        },

        indexOf: function (v) {
            return BI.contains(this.array, v);
        },

        getElementByIndex: function (index) {
            return this.array[index];
        },

        push: function (v) {
            this.array.push(v);
            if (this.capacity && this.array.length > this.capacity) {
                this.array.shift();
            }
        },

        pop: function () {
            this.array.pop();
        },

        shift: function () {
            this.array.shift();
        },

        unshift: function (v) {
            this.array.unshift(v);
            if (this.capacity && this.array.length > this.capacity) {
                this.array.pop();
            }
        },

        remove: function (v) {
            BI.remove(this.array, v);
        },

        splice: function () {
            this.array.splice.apply(this.array, arguments);
        },

        slice: function () {
            this.array.slice.apply(this.array, arguments);
        },

        size: function () {
            return this.array.length;
        },

        each: function (fn, scope) {
            var scope = scope || window;
            var fn = fn || null;
            if (fn == null || typeof (fn) !== "function") {
                return;
            }
            for (var i = 0; i < this.array.length; i++) {
                var re = fn.call(scope, i, this.array[i], this.array);
                if (re == false) {
                    break;
                }
            }
        },

        toArray: function () {
            return this.array;
        },

        fromArray: function (array) {
            var self = this;
            BI.each(array, function (i, v) {
                self.push(v);
            });
        },

        clear: function () {
            this.array.length = 0;
        }
    };
})();