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cache-offline-debug.js
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cache-offline-min.js
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cache-offline.js
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Editing: cache-offline-debug.js
YUI.add('cache-offline', function (Y, NAME) { /** * Provides a Cache subclass which uses HTML5 `localStorage` for persistence. * * @module cache * @submodule cache-offline */ /** * Extends Cache utility with offline functionality. * @class CacheOffline * @extends Cache * @constructor */ function CacheOffline() { CacheOffline.superclass.constructor.apply(this, arguments); } var localStorage = null, JSON = Y.JSON; // Bug 2529572 try { localStorage = Y.config.win.localStorage; } catch(e) { Y.log("Could not access localStorage.", "warn", "cache"); } ///////////////////////////////////////////////////////////////////////////// // // CacheOffline events // ///////////////////////////////////////////////////////////////////////////// /** * @event error * @description Fired when an entry could not be added, most likely due to * exceeded browser quota. * <dl> * <dt>error (Object)</dt> <dd>The error object.</dd> * </dl> */ ///////////////////////////////////////////////////////////////////////////// // // CacheOffline static // ///////////////////////////////////////////////////////////////////////////// Y.mix(CacheOffline, { /** * Class name. * * @property NAME * @type String * @static * @final * @value "cacheOffline" */ NAME: "cacheOffline", ATTRS: { ///////////////////////////////////////////////////////////////////////////// // // CacheOffline Attributes // ///////////////////////////////////////////////////////////////////////////// /** * @attribute sandbox * @description A string that must be passed in via the constructor. * This identifier is used to sandbox one cache instance's entries * from another. Calling the cache instance's flush and length methods * or get("entries") will apply to only these sandboxed entries. * @type String * @default "default" * @initOnly */ sandbox: { value: "default", writeOnce: "initOnly" }, /** * @attribute expires * @description Absolute Date when data expires or * relative number of milliseconds. Zero disables expiration. * @type Date | Number * @default 86400000 (one day) */ expires: { value: 86400000 }, /** * @attribute max * @description Disabled. * @readOnly * @default null */ max: { value: null, readOnly: true }, /** * @attribute uniqueKeys * @description Always true for CacheOffline. * @readOnly * @default true */ uniqueKeys: { value: true, readOnly: true, setter: function() { return true; } } }, /** * Removes all items from all sandboxes. Useful if localStorage has * exceeded quota. Only supported on browsers that implement HTML 5 * localStorage. * * @method flushAll * @static */ flushAll: function() { var store = localStorage, key; if(store) { if(store.clear) { store.clear(); } // FF2.x and FF3.0.x else { for (key in store) { if (store.hasOwnProperty(key)) { store.removeItem(key); delete store[key]; } } } Y.log("All sandboxes of OfflineCache flushed", "info", "cache"); } else { Y.log("Could not flush all OfflineCache sandboxes.", "warn", "cache"); } } }); Y.extend(CacheOffline, Y.Cache, localStorage ? { ///////////////////////////////////////////////////////////////////////////// // // Offline is supported // ///////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////// // // CacheOffline protected methods // ///////////////////////////////////////////////////////////////////////////// /** * Always return null. * * @method _setMax * @protected */ _setMax: function(value) { return null; }, /** * Gets size. * * @method _getSize * @protected */ _getSize: function() { var count = 0, i=0, l=localStorage.length; for(; i<l; ++i) { // Match sandbox id if(localStorage.key(i).indexOf(this.get("sandbox")) === 0) { count++; } } return count; }, /** * Gets all entries. * * @method _getEntries * @protected */ _getEntries: function() { var entries = [], i=0, l=localStorage.length, sandbox = this.get("sandbox"); for(; i<l; ++i) { // Match sandbox id if(localStorage.key(i).indexOf(sandbox) === 0) { entries[i] = JSON.parse(localStorage.key(i).substring(sandbox.length)); } } return entries; }, /** * Adds entry to cache. * * @method _defAddFn * @param e {EventFacade} Event Facade with the following properties: * <dl> * <dt>entry (Object)</dt> <dd>The cached entry.</dd> * </dl> * @protected */ _defAddFn: function(e) { var entry = e.entry, request = entry.request, cached = entry.cached, expires = entry.expires; // Convert Dates to msecs on the way into localStorage entry.cached = cached.getTime(); entry.expires = expires ? expires.getTime() : expires; try { localStorage.setItem(this.get("sandbox")+JSON.stringify({"request":request}), JSON.stringify(entry)); Y.log("Cached offline entry: " + Y.dump(entry), "info", "cache"); } catch(error) { this.fire("error", {error:error}); Y.log("Could not cache offline entry: " + Y.dump(entry) + " due to error: " + Y.dump(error), "warn", "cache"); } }, /** * Flushes cache. * * @method _defFlushFn * @param e {EventFacade} Event Facade object. * @protected */ _defFlushFn: function(e) { var key, i=localStorage.length-1; for(; i>-1; --i) { // Match sandbox id key = localStorage.key(i); if(key.indexOf(this.get("sandbox")) === 0) { localStorage.removeItem(key); } } }, ///////////////////////////////////////////////////////////////////////////// // // CacheOffline public methods // ///////////////////////////////////////////////////////////////////////////// /** * Adds a new entry to the cache of the format * {request:request, response:response, cached:cached, expires: expires}. * * @method add * @param request {Object} Request value must be a String or JSON. * @param response {Object} Response value must be a String or JSON. */ /** * Retrieves cached object for given request, if available. * Returns null if there is no cache match. * * @method retrieve * @param request {Object} Request object. * @return {Object} Cached object with the properties request, response, * and expires, or null. */ retrieve: function(request) { this.fire("request", {request: request}); var entry, expires, sandboxedrequest; try { sandboxedrequest = this.get("sandbox")+JSON.stringify({"request":request}); try { entry = JSON.parse(localStorage.getItem(sandboxedrequest)); } catch(e) { } } catch(e2) { } if(entry) { // Convert msecs to Dates on the way out of localStorage entry.cached = new Date(entry.cached); expires = entry.expires; expires = !expires ? null : new Date(expires); entry.expires = expires; if(this._isMatch(request, entry)) { this.fire("retrieve", {entry: entry}); Y.log("Retrieved offlinecached response: " + Y.dump(entry) + " for request: " + Y.dump(request), "info", "cache"); return entry; } } return null; } } : ///////////////////////////////////////////////////////////////////////////// // // Offline is not supported // ///////////////////////////////////////////////////////////////////////////// { /** * Always return null. * * @method _setMax * @protected */ _setMax: function(value) { return null; } }); Y.CacheOffline = CacheOffline; }, '3.18.1', {"requires": ["cache-base", "json"]});
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