orbit-common-local-storage.js

(function() {

// Share loader properties from globalized Orbit package
var define = window.Orbit.__define__;
var requireModule = window.Orbit.__requireModule__;

define('orbit-common/local-storage-source', ['exports', 'orbit/lib/assert', 'orbit-common/memory-source'], function (exports, assert, MemorySource) {

  'use strict';

  var supportsLocalStorage = function() {
    try {
      return 'localStorage' in window && window['localStorage'] !== null;
    } catch(e) {
      return false;
    }
  };

  /**
   Source for storing data in local storage

   @class LocalStorageSource
   @extends MemorySource
   @namespace OC
   @param {OC.Schema} schema
   @param {Object}    [options]
   @constructor
   */
  var LocalStorageSource = MemorySource['default'].extend({
    init: function(schema, options) {
      assert.assert('Your browser does not support local storage!', supportsLocalStorage());

      this._super.apply(this, arguments);

      options = options || {};
      this.namespace = options['namespace'] || 'orbit'; // local storage key
      this._autosave = options['autosave'] !== undefined ? options['autosave'] : true;
      var autoload = options['autoload'] !== undefined ? options['autoload'] : true;

      this._isDirty = false;

      this.on('didTransform', function() {
        this._saveData();
      }, this);

      if (autoload) this.load();
    },

    load: function() {
      var storage = window.localStorage.getItem(this.namespace);
      if (storage) {
        this.reset(JSON.parse(storage));
      }
    },

    enableAutosave: function() {
      if (!this._autosave) {
        this._autosave = true;
        if (this._isDirty) this._saveData();
      }
    },

    disableAutosave: function() {
      if (this._autosave) {
        this._autosave = false;
      }
    },

    /////////////////////////////////////////////////////////////////////////////
    // Internals
    /////////////////////////////////////////////////////////////////////////////

    _saveData: function(forceSave) {
      if (!this._autosave && !forceSave) {
        this._isDirty = true;
        return;
      }
      window.localStorage.setItem(this.namespace, JSON.stringify(this.retrieve()));
      this._isDirty = false;
    }
  });

  exports['default'] = LocalStorageSource;

});
window.OC.LocalStorageSource = requireModule("orbit-common/local-storage-source")["default"];

})();
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