The Tor Browser / file comparison
comparison: browser/components/sessionstore/src/TabStateCache.jsm
browser/components/sessionstore/src/TabStateCache.jsm
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| 1 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 2 * License, v. 2.0. If a copy of the MPL was not distributed with this file, | |
| 3 * You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 4 | |
| 5 "use strict"; | |
| 6 | |
| 7 this.EXPORTED_SYMBOLS = ["TabStateCache"]; | |
| 8 | |
| 9 /** | |
| 10 * A cache for tabs data. | |
| 11 * | |
| 12 * This cache implements a weak map from tabs (as XUL elements) | |
| 13 * to tab data (as objects). | |
| 14 * | |
| 15 * Note that we should never cache private data, as: | |
| 16 * - that data is used very seldom by SessionStore; | |
| 17 * - caching private data in addition to public data is memory consuming. | |
| 18 */ | |
| 19 this.TabStateCache = Object.freeze({ | |
| 20 /** | |
| 21 * Retrieves cached data for a given |browser|. | |
| 22 * | |
| 23 * @param browser (xul:browser) | |
| 24 * The browser to retrieve cached data for. | |
| 25 * @return (object) | |
| 26 * The cached data stored for the given |browser|. | |
| 27 */ | |
| 28 get: function (browser) { | |
| 29 return TabStateCacheInternal.get(browser); | |
| 30 }, | |
| 31 | |
| 32 /** | |
| 33 * Updates cached data for a given |browser|. | |
| 34 * | |
| 35 * @param browser (xul:browser) | |
| 36 * The browser belonging to the given tab data. | |
| 37 * @param newData (object) | |
| 38 * The new data to be stored for the given |browser|. | |
| 39 */ | |
| 40 update: function (browser, newData) { | |
| 41 TabStateCacheInternal.update(browser, newData); | |
| 42 } | |
| 43 }); | |
| 44 | |
| 45 let TabStateCacheInternal = { | |
| 46 _data: new WeakMap(), | |
| 47 | |
| 48 /** | |
| 49 * Retrieves cached data for a given |browser|. | |
| 50 * | |
| 51 * @param browser (xul:browser) | |
| 52 * The browser to retrieve cached data for. | |
| 53 * @return (object) | |
| 54 * The cached data stored for the given |browser|. | |
| 55 */ | |
| 56 get: function (browser) { | |
| 57 return this._data.get(browser.permanentKey); | |
| 58 }, | |
| 59 | |
| 60 /** | |
| 61 * Updates cached data for a given |browser|. | |
| 62 * | |
| 63 * @param browser (xul:browser) | |
| 64 * The browser belonging to the given tab data. | |
| 65 * @param newData (object) | |
| 66 * The new data to be stored for the given |browser|. | |
| 67 */ | |
| 68 update: function (browser, newData) { | |
| 69 let data = this._data.get(browser.permanentKey) || {}; | |
| 70 | |
| 71 for (let key of Object.keys(newData)) { | |
| 72 let value = newData[key]; | |
| 73 if (value === null) { | |
| 74 delete data[key]; | |
| 75 } else { | |
| 76 data[key] = value; | |
| 77 } | |
| 78 } | |
| 79 | |
| 80 this._data.set(browser.permanentKey, data); | |
| 81 } | |
| 82 }; |
