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-/* ***** BEGIN LICENSE BLOCK *****
- * Version: MPL 1.1/GPL 2.0/LGPL 2.1
- *
- * The contents of this file are subject to the Mozilla Public License Version
- * 1.1 (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.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
- * for the specific language governing rights and limitations under the
- * License.
- *
- * The Original Code is Preferences.
- *
- * The Initial Developer of the Original Code is Mozilla.
- * Portions created by the Initial Developer are Copyright (C) 2008
- * the Initial Developer. All Rights Reserved.
- *
- * Contributor(s):
- * Myk Melez <myk@mozilla.org>
- * Daniel Aquino <mr.danielaquino@gmail.com>
- * Atul Varma <atul@mozilla.com>
- * Erik Vold <erikvvold@gmail.com>
- *
- * Alternatively, the contents of this file may be used under the terms of
- * either the GNU General Public License Version 2 or later (the "GPL"), or
- * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
- * in which case the provisions of the GPL or the LGPL are applicable instead
- * of those above. If you wish to allow use of your version of this file only
- * under the terms of either the GPL or the LGPL, and not to allow others to
- * use your version of this file under the terms of the MPL, indicate your
- * decision by deleting the provisions above and replace them with the notice
- * and other provisions required by the GPL or the LGPL. If you do not delete
- * the provisions above, a recipient may use your version of this file under
- * the terms of any one of the MPL, the GPL or the LGPL.
- *
- * ***** END LICENSE BLOCK ***** */
-
-"use strict";
-
-// The minimum and maximum integers that can be set as preferences.
-// The range of valid values is narrower than the range of valid JS values
-// because the native preferences code treats integers as NSPR PRInt32s,
-// which are 32-bit signed integers on all platforms.
-const MAX_INT = 0x7FFFFFFF;
-const MIN_INT = -0x80000000;
-
-const {Cc,Ci,Cr} = require("chrome");
-
-var prefSvc = Cc["@mozilla.org/preferences-service;1"].
- getService(Ci.nsIPrefService).getBranch(null);
-
-var get = exports.get = function get(name, defaultValue) {
- switch (prefSvc.getPrefType(name)) {
- case Ci.nsIPrefBranch.PREF_STRING:
- return prefSvc.getComplexValue(name, Ci.nsISupportsString).data;
-
- case Ci.nsIPrefBranch.PREF_INT:
- return prefSvc.getIntPref(name);
-
- case Ci.nsIPrefBranch.PREF_BOOL:
- return prefSvc.getBoolPref(name);
-
- case Ci.nsIPrefBranch.PREF_INVALID:
- return defaultValue;
-
- default:
- // This should never happen.
- throw new Error("Error getting pref " + name +
- "; its value's type is " +
- prefSvc.getPrefType(name) +
- ", which I don't know " +
- "how to handle.");
- }
-};
-
-var set = exports.set = function set(name, value) {
- var prefType;
- if (typeof value != "undefined" && value != null)
- prefType = value.constructor.name;
-
- switch (prefType) {
- case "String":
- {
- var string = Cc["@mozilla.org/supports-string;1"].
- createInstance(Ci.nsISupportsString);
- string.data = value;
- prefSvc.setComplexValue(name, Ci.nsISupportsString, string);
- }
- break;
-
- case "Number":
- // We throw if the number is outside the range or not an integer, since
- // the result will not be what the consumer wanted to store.
- if (value > MAX_INT || value < MIN_INT)
- throw new Error("you cannot set the " + name +
- " pref to the number " + value +
- ", as number pref values must be in the signed " +
- "32-bit integer range -(2^31) to 2^31-1. " +
- "To store numbers outside that range, store " +
- "them as strings.");
- if (value % 1 != 0)
- throw new Error("cannot store non-integer number: " + value);
- prefSvc.setIntPref(name, value);
- break;
-
- case "Boolean":
- prefSvc.setBoolPref(name, value);
- break;
-
- default:
- throw new Error("can't set pref " + name + " to value '" + value +
- "'; it isn't a string, integer, or boolean");
- }
-};
-
-var has = exports.has = function has(name) {
- return (prefSvc.getPrefType(name) != Ci.nsIPrefBranch.PREF_INVALID);
-};
-
-var isSet = exports.isSet = function isSet(name) {
- return (has(name) && prefSvc.prefHasUserValue(name));
-};
-
-var reset = exports.reset = function reset(name) {
- try {
- prefSvc.clearUserPref(name);
- } catch (e if e.result == Cr.NS_ERROR_UNEXPECTED) {
- // The pref service throws NS_ERROR_UNEXPECTED when the caller tries
- // to reset a pref that doesn't exist or is already set to its default
- // value. This interface fails silently in those cases, so callers
- // can unconditionally reset a pref without having to check if it needs
- // resetting first or trap exceptions after the fact. It passes through
- // other exceptions, however, so callers know about them, since we don't
- // know what other exceptions might be thrown and what they might mean.
- }
-};