1 /*
  2  Copyright (c) 2011, Alexandru Bularca <alexandru.bularca@1and1.ro>
  3  All rights reserved.
  4 
  5  Redistribution and use in source and binary forms, with or without
  6  modification, are permitted provided that the following conditions are met:
  7  * Redistributions of source code must retain the above copyright
  8  notice, this list of conditions and the following disclaimer.
  9  * Redistributions in binary form must reproduce the above copyright
 10  notice, this list of conditions and the following disclaimer in the
 11  documentation and/or other materials provided with the distribution.
 12  * Neither the name of the <organization> nor the
 13  names of its contributors may be used to endorse or promote products
 14  derived from this software without specific prior written permission.
 15 
 16  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 17  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 18  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 19  DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
 20  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 21  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 22  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 23  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 24  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 25  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 26  */
 27 
 28 define(['core-components/lib/amplify.store'], function (driver) {
 29     var storageTypes = {
 30         'persistent': [
 31             'localStorage',
 32             'globalStorage',
 33             'userData'
 34         ],
 35         transient: [
 36             'sessionStorage',
 37             'memory'
 38         ]
 39     };
 40 
 41     function getStorage(type) {
 42         var type = (type) ? 'transient' : 'persistent';
 43 
 44         for (var i in storageTypes[type]) {
 45             var storage = storageTypes[type][i];
 46 
 47             if(storage in driver.store.types) {
 48                 return driver.store.types[storage];
 49             }
 50         }
 51 
 52         return driver.store;
 53     }
 54 
 55     function ClientStorage (viewContext) {
 56         this.context = viewContext.instanceId;
 57     }
 58 
 59     /**
 60      * Set the value of key (add it if key doesn't exist) into storage
 61      *
 62      * @param {String} key
 63      * @param {Object} value
 64      * @param {Boolean} isTransient whether to use persistent storage or transient storage (defaults to false)
 65      * @throws {Error} if client storage is not supported
 66      */
 67     ClientStorage.prototype.set = function (key, value, isTransient) {
 68         var storage = getStorage(isTransient);
 69 
 70         storage(key, value, {expires: false});
 71     };
 72 
 73     /**
 74      * Retrieves the value of key from storage
 75      * @param {String} key
 76      * @param {Boolean} isTransient whether to use persistent storage or transient storage (defaults to false)
 77      * @returns {String|Boolean} the value of key or null on failure
 78      * @throws {Error} if client storage is not supported
 79      */
 80     ClientStorage.prototype.get = function (key, isTransient) {
 81         var storage = getStorage(isTransient);
 82 
 83         value = storage(key);
 84 
 85         return value;
 86     };
 87 
 88     /**
 89      * Remove the key from storage
 90      *
 91      * @param {String} key
 92      * @param {Boolean} isTransient whether to use persistent storage or transient storage (defaults to false)
 93      * @throws {Error} if client storage is not supported
 94      */
 95     ClientStorage.prototype.remove = function (key, isTransient) {
 96         var storage = getStorage(isTransient);
 97 
 98         storage(key, null);
 99     };
100 
101     ClientStorage.prototype.addListener = function (callback) {
102         // TODO: code here later
103     };
104 
105     ClientStorage.prototype.removeListener = function (callback) {
106         // TODO: code here
107     };
108 
109     return ClientStorage;
110 });
111