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/*
* Copyright (c) 2014 Samsung Electronics Co., Ltd. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*global define, console*/
/**
* Settings model.
* @requires {@link core/storage/idb}
* @requires {@link core/event}
* @namespace Altimeter/models/settings
* @memberof Altimeter/models
*/
define({
name: 'models/settings',
requires: [
'core/storage/idb',
'core/event'
],
def: function modelsSettings(req) {
'use strict';
/**
* Core event module.
* @type {Module}
*/
var e = req.core.event,
/**
* Core IDB storage module.
* @type {Module}
*/
s = req.core.storage.idb,
/**
* Storage key.
* @type {string}
*/
STORAGE_KEY = 'settings',
/**
* Default pressure.
* @type {object}
*/
DEFAULT = Object.freeze({
pressure: 1013.25
}),
/**
* Settings object.
* @type {object}
*/
settings = {};
/**
* Saves settings to storage.
*/
function saveSettings() {
s.add(STORAGE_KEY, settings);
}
/**
* Sets given settings property.
* @memberof Altimeter/models/settings
* @param {string} property
* @param {number} value
* @return {boolean}
*/
function set(property, value) {
if (property !== undefined && value !== undefined) {
settings[property] = value;
saveSettings();
return true;
}
return false;
}
/**
* Returns given settings property.
* @memberof Altimeter/models/settings
* @param {string} property
* @return {number}
*/
function get(property) {
if (settings[property] === undefined) {
console.error('Settings not initialized yet.');
return null;
}
return settings[property];
}
/**
* Initializes module.
*/
function init() {
s.get(STORAGE_KEY);
}
/**
* Handles core.storage.idb.read event.
* @param {event} ev
*/
function onRead(ev) {
if (ev.detail.key !== STORAGE_KEY) {
return;
}
if (typeof ev.detail.value !== 'object') {
settings = {
pressure: DEFAULT.pressure
};
saveSettings();
} else {
settings = ev.detail.value;
}
e.fire('ready');
}
/**
* Make sure that init is run when storage is ready.
* @memberof Altimeter/models/settings
*/
function runInit() {
if (s.isReady()) {
init();
} else {
e.listen('core.storage.idb.open', init);
}
}
e.listeners({
'core.storage.idb.read': onRead
});
return {
init: runInit,
get: get,
set: set
};
}
});
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