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67 lines
2.2 KiB
JavaScript
67 lines
2.2 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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this.EXPORTED_SYMBOLS = [
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"TelemetryUtils"
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];
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const {classes: Cc, interfaces: Ci, results: Cr, utils: Cu} = Components;
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this.TelemetryUtils = {
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/**
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* Takes a date and returns it trunctated to a date with daily precision.
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*/
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truncateToDays: function(date) {
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return new Date(date.getFullYear(),
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date.getMonth(),
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date.getDate(),
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0, 0, 0, 0);
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},
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/**
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* Check if the difference between the times is within the provided tolerance.
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* @param {Number} t1 A time in milliseconds.
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* @param {Number} t2 A time in milliseconds.
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* @param {Number} tolerance The tolerance, in milliseconds.
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* @return {Boolean} True if the absolute time difference is within the tolerance, false
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* otherwise.
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*/
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areTimesClose: function(t1, t2, tolerance) {
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return Math.abs(t1 - t2) <= tolerance;
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},
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/**
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* Get the next midnight for a date.
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* @param {Object} date The date object to check.
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* @return {Object} The Date object representing the next midnight.
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*/
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getNextMidnight: function(date) {
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let nextMidnight = new Date(this.truncateToDays(date));
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nextMidnight.setDate(nextMidnight.getDate() + 1);
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return nextMidnight;
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},
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/**
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* Get the midnight which is closer to the provided date.
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* @param {Object} date The date object to check.
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* @param {Number} tolerance The tolerance within we find the closest midnight.
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* @return {Object} The Date object representing the closes midnight, or null if midnight
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* is not within the midnight tolerance.
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*/
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getNearestMidnight: function(date, tolerance) {
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let lastMidnight = this.truncateToDays(date);
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if (this.areTimesClose(date.getTime(), lastMidnight.getTime(), tolerance)) {
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return lastMidnight;
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}
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const nextMidnightDate = this.getNextMidnight(date);
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if (this.areTimesClose(date.getTime(), nextMidnightDate.getTime(), tolerance)) {
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return nextMidnightDate;
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}
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return null;
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},
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};
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