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