RetroZilla/extensions/inspector/resources/content/jsutil/system/PrefUtils.js
2015-10-20 23:03:22 -04:00

124 lines
4.2 KiB
JavaScript

/* ***** 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 mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 2001
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Joe Hewitt <hewitt@netscape.com> (original author)
*
* 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 ***** */
/***************************************************************
* PrefUtils -------------------------------------------------
* Utility for easily using the Mozilla preferences system.
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
* REQUIRED IMPORTS:
****************************************************************/
//////////// global variables /////////////////////
//////////// global constants ////////////////////
const nsIPrefBranch = Components.interfaces.nsIPrefBranch;
////////////////////////////////////////////////////////////////////////////
//// class PrefUtils
var PrefUtils =
{
mPrefs: null,
init: function()
{
var prefService = XPCU.getService("@mozilla.org/preferences-service;1", "nsIPrefService");
this.mPrefs = prefService.getBranch(null);
},
addObserver: function(aDomain, aFunction)
{
if (!this.mPrefs) this.init();
var pbi = XPCU.QI(this.mPrefs, "nsIPrefBranchInternal");
if (pbi)
pbi.addObserver(aDomain, aFunction, false);
},
removeObserver: function(aDomain, aFunction)
{
if (!this.mPrefs) this.init();
var pbi = XPCU.QI(this.mPrefs, "nsIPrefBranchInternal");
if (pbi)
pbi.removeObserver(aDomain, aFunction);
},
setPref: function(aName, aValue)
{
if (!this.mPrefs) this.init();
var type = this.mPrefs.getPrefType(aName);
try {
if (type == nsIPrefBranch.PREF_STRING) {
var str = Components.classes["@mozilla.org/supports-string;1"]
.createInstance(Components.interfaces.nsISupportsString);
str.data = aValue;
this.mPrefs.setComplexValue(aName, Components.interfaces.nsISupportsString, str);
} else if (type == nsIPrefBranch.PREF_BOOL) {
this.mPrefs.setBoolPref(aName, aValue);
} else if (type == nsIPrefBranch.PREF_INT) {
this.mPrefs.setIntPref(aName, aValue);
}
} catch(ex) {
debug("ERROR: Unable to write pref \"" + aName + "\".\n");
}
},
getPref: function(aName)
{
if (!this.mPrefs) this.init();
var type = this.mPrefs.getPrefType(aName);
try {
if (type == nsIPrefBranch.PREF_STRING) {
return this.mPrefs.getComplexValue(aName, Components.interfaces.nsISupportsString).data;
} else if (type == nsIPrefBranch.PREF_BOOL) {
return this.mPrefs.getBoolPref(aName);
} else if (type == nsIPrefBranch.PREF_INT) {
return this.mPrefs.getIntPref(aName);
}
} catch(ex) {
debug("ERROR: Unable to read pref \"" + aName + "\".\n");
}
return null;
}
};