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( function () {
'use strict';
// Catch exceptions to avoid fatal in Chrome's "Block data storage" mode
// which throws when accessing the localStorage property itself, as opposed
// to the standard behaviour of throwing on getItem/setItem. (T148998)
var
localStorage = ( function () {
try {
return window.localStorage;
} catch ( e ) {}
}() ),
sessionStorage = ( function () {
try {
return window.sessionStorage;
} catch ( e ) {}
}() );
/**
* A wrapper for an HTML5 Storage interface (`localStorage` or `sessionStorage`)
* that is safe to call on all browsers.
*
* @class mw.SafeStorage
* @private
* @param {Object|undefined} store The Storage instance to wrap around
*/
function SafeStorage( store ) {
this.store = store;
}
/**
* Retrieve value from device storage.
*
* @param {string} key Key of item to retrieve
* @return {string|null|boolean} String value, null if no value exists, or false
* if localStorage is not available.
*/
SafeStorage.prototype.get = function ( key ) {
try {
return this.store.getItem( key );
} catch ( e ) {}
return false;
};
/**
* Set a value in device storage.
*
* @param {string} key Key name to store under
* @param {string} value Value to be stored
* @return {boolean} Whether the save succeeded or not
*/
SafeStorage.prototype.set = function ( key, value ) {
try {
this.store.setItem( key, value );
return true;
} catch ( e ) {}
return false;
};
/**
* Remove a value from device storage.
*
* @param {string} key Key of item to remove
* @return {boolean} Whether the save succeeded or not
*/
SafeStorage.prototype.remove = function ( key ) {
try {
this.store.removeItem( key );
return true;
} catch ( e ) {}
return false;
};
/**
* A wrapper for the HTML5 `localStorage` interface
* that is safe to call on all browsers.
*
* @class
* @singleton
* @extends mw.SafeStorage
*/
mw.storage = new SafeStorage( localStorage );
/**
* A wrapper for the HTML5 `sessionStorage` interface
* that is safe to call on all browsers.
*
* @class
* @singleton
* @extends mw.SafeStorage
*/
mw.storage.session = new SafeStorage( sessionStorage );
}() );
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