gecko-dev/dom/settings/SettingsDB.jsm

115 строки
4.1 KiB
JavaScript

/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
let Cc = Components.classes;
let Ci = Components.interfaces;
let Cu = Components.utils;
this.EXPORTED_SYMBOLS = ["SettingsDB", "SETTINGSDB_NAME", "SETTINGSSTORE_NAME"];
const DEBUG = false;
function debug(s) {
if (DEBUG) dump("-*- SettingsDB: " + s + "\n");
}
this.SETTINGSDB_NAME = "settings";
this.SETTINGSDB_VERSION = 2;
this.SETTINGSSTORE_NAME = "settings";
Cu.import("resource://gre/modules/IndexedDBHelper.jsm");
Cu.import("resource://gre/modules/FileUtils.jsm");
Cu.import("resource://gre/modules/NetUtil.jsm");
this.SettingsDB = function SettingsDB() {}
SettingsDB.prototype = {
__proto__: IndexedDBHelper.prototype,
upgradeSchema: function upgradeSchema(aTransaction, aDb, aOldVersion, aNewVersion) {
let objectStore;
if (aOldVersion == 0) {
objectStore = aDb.createObjectStore(SETTINGSSTORE_NAME, { keyPath: "settingName" });
if (DEBUG) debug("Created object stores");
} else if (aOldVersion == 1) {
if (DEBUG) debug("Get object store for upgrade and remove old index");
objectStore = aTransaction.objectStore(SETTINGSSTORE_NAME);
objectStore.deleteIndex("settingValue");
} else {
if (DEBUG) debug("Get object store for upgrade");
objectStore = aTransaction.objectStore(SETTINGSSTORE_NAME);
}
// Loading resource://app/defaults/settings.json doesn't work because
// settings.json is not in the omnijar.
// So we look for the app dir instead and go from here...
let settingsFile = FileUtils.getFile("DefRt", ["settings.json"], false);
if (!settingsFile || (settingsFile && !settingsFile.exists())) {
// On b2g desktop builds the settings.json file is moved in the
// profile directory by the build system.
settingsFile = FileUtils.getFile("ProfD", ["settings.json"], false);
if (!settingsFile || (settingsFile && !settingsFile.exists())) {
return;
}
}
let chan = NetUtil.newChannel(settingsFile);
let stream = chan.open();
// Obtain a converter to read from a UTF-8 encoded input stream.
let converter = Cc["@mozilla.org/intl/scriptableunicodeconverter"]
.createInstance(Ci.nsIScriptableUnicodeConverter);
converter.charset = "UTF-8";
let rawstr = converter.ConvertToUnicode(NetUtil.readInputStreamToString(
stream,
stream.available()) || "");
let settings;
try {
settings = JSON.parse(rawstr);
} catch(e) {
if (DEBUG) debug("Error parsing " + settingsFile.path + " : " + e);
return;
}
stream.close();
objectStore.openCursor().onsuccess = function(event) {
let cursor = event.target.result;
if (cursor) {
let value = cursor.value;
if (value.settingName in settings) {
if (DEBUG) debug("Upgrade " +settings[value.settingName]);
value.defaultValue = settings[value.settingName];
delete settings[value.settingName];
if ("settingValue" in value) {
value.userValue = value.settingValue;
delete value.settingValue;
}
cursor.update(value);
} else if ("userValue" in value || "settingValue" in value) {
value.defaultValue = undefined;
if (aOldVersion == 1 && value.settingValue) {
value.userValue = value.settingValue;
delete value.settingValue;
}
cursor.update(value);
} else {
cursor.delete();
}
cursor.continue();
} else {
for (let name in settings) {
if (DEBUG) debug("Set new:" + name +", " + settings[name]);
objectStore.add({ settingName: name, defaultValue: settings[name], userValue: undefined });
}
}
};
},
init: function init(aGlobal) {
this.initDBHelper(SETTINGSDB_NAME, SETTINGSDB_VERSION,
[SETTINGSSTORE_NAME], aGlobal);
}
}