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/**
* Copyright 2014 IBM Corp.
*
* 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.
**/
var when = require("when");
var assert = require("assert");
var userSettings = null;
var globalSettings = null;
var storage = null;
var persistentSettings = {
init: function(settings) {
userSettings = settings;
for (var i in settings) {
if (settings.hasOwnProperty(i)) {
(function() {
var j = i;
persistentSettings.__defineGetter__(j,function() { return userSettings[j]; });
persistentSettings.__defineSetter__(j,function() { throw new Error("Property '"+i+"' is read-only"); });
})();
}
}
globalSettings = null;
},
load: function(_storage) {
storage = _storage;
return storage.getSettings().then(function(_settings) {
globalSettings = _settings;
});
},
get: function(prop) {
if (userSettings.hasOwnProperty(prop)) {
return userSettings[prop];
}
if (globalSettings === null) {
throw new Error("Settings not available");
}
return globalSettings[prop];
},
set: function(prop,value) {
if (userSettings.hasOwnProperty(prop)) {
throw new Error("Property '"+prop+"' is read-only");
}
if (globalSettings === null) {
throw new Error("Settings not available");
}
var current = globalSettings[prop];
globalSettings[prop] = value;
try {
assert.deepEqual(current,value);
return when.resolve();
} catch(err) {
return storage.saveSettings(globalSettings);
}
},
available: function() {
return (globalSettings !== null);
},
reset: function() {
userSettings = null;
globalSettings = null;
storage = null;
}
}
module.exports = persistentSettings;
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