/usr/share/xul-ext/downthemall/modules/preferences.jsm is in xul-ext-downthemall 2.0.13-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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const EXPORTED_SYMBOLS = [
'get',
'getExt',
'getBranch',
'set',
'setExt',
'hasUserValue',
'hasUserValueExt',
'getChildren',
'getChildrenExt',
'reset',
'resetExt',
'resetBranch',
'resetBranchExt',
'resetAllExt',
'addObserver',
'removeObserver',
'makeObserver'
];
// Base extension branch
// Third parties reusing this module must specify own branch!
const EXT = 'extensions.dta.';
const Cc = Components.classes;
const Ci = Components.interfaces;
const Ctor = Components.Constructor;
const log = Components.utils.reportError;
const nsIPrefBranch = Ci.nsIPrefBranch;
const nsIPrefBranch2 = Ci.nsIPrefBranch2;
const PREF_STRING = nsIPrefBranch.PREF_STRING;
const PREF_INT = nsIPrefBranch.PREF_INT;
const PREF_BOOL = nsIPrefBranch.PREF_BOOL;
const SupportsString = new Ctor('@mozilla.org/supports-string;1', 'nsISupportsString');
const prefs = Cc['@mozilla.org/preferences-service;1'].getService(Ci.nsIPrefBranch);
/**
* Gets a preference (based on root)
* @param key (string) Key of the preference
* @param defaultValue (mixed) Default value to be returned if preference does not exist
* @return (mixed) Value of the preference or defaultValue
*/
function get(key, defaultValue){
try {
let rv;
switch (prefs.getPrefType(key)) {
case PREF_INT:
rv = prefs.getIntPref(key);
break;
case PREF_BOOL:
rv = prefs.getBoolPref(key);
break;
default:
rv = getMultiByte(key);
break;
}
if (rv != undefined) {
return rv;
}
}
catch (ex) {
// no-op
}
return defaultValue;
}
/**
* Gets a preference (based on extension branch)
* @param key (string) Key of the preference
* @param defaultValue (mixed) Default value to be returned if preference does not exist
* @return (mixed) Value of the preference or defaultValue
*/
function getExt(key, defaultValue) {
return get(EXT + key, defaultValue);
}
/**
* Gets a preference branch
* @param branch (string) Branch to get
* @return (nsIPrefBranch) Requested branch
*/
function getBranch(branch) {
return prefs.getBranch(branch);
}
/**
* Sets a preference (based on root)
* @param key (string) Key of the preference to set
* @param value (mixed) value of the preference to set
* @throws Value-type/Preference-type mismatch
*/
function set(key, value){
if (typeof value == 'number' || value instanceof Number) {
return prefs.setIntPref(key, value);
}
if (typeof value == 'boolean' || value instanceof Boolean) {
return prefs.setBoolPref(key, value);
}
return setMultiByte(key, value);
}
/**
* Sets a preference (based on branch)
* @param key (string) Key of the preference to set
* @param value (mixed) value of the preference to set
* @throws Value-type/Preference-type mismatch
*/
function setExt(key, value){
return set(EXT + key, value);
}
// Helper: get a (multi-byte) string
function getMultiByte(key, defaultValue){
try {
return prefs.getComplexValue(key, Ci.nsISupportsString).data;
}
catch (ex) {
// no-op
}
return defaultValue;
}
//Helper: Set a (multi-byte) string
function setMultiByte(key, value) {
let str = new SupportsString();
str.data = value.toString();
prefs.setComplexValue(key, Ci.nsISupportsString, str);
}
/**
* Preference has a user provided value, i.e. not the default value (based on root)
* @param key (string) Key of the preference to check
* @return (boolean) Has user value
*/
function hasUserValue(key) {
try {
return prefs.prefHasUserValue(key);
}
catch (ex) {
// no-op
}
return false;
}
/**
* Preference has a user provided value, i.e. not the default value (based on branch)
* @param key (string) Key of the preference to check
* @return (boolean) Has user value
*/
function hasUserValueExt(key) {
return hasUserValue(EXT + key);
}
/**
* Enumerate all children of a preference (based on root)
* @param key (string) Key of the preference
* @return (array) Sub-preferences
*/
function getChildren(key) {
return prefs.getChildList(key, {});
}
/**
* Enumerate all children of a preference (based on branch)
* @param key (string) Key of the preference
* @return (array) Sub-preferences
*/
function getChildrenExt(key) {
return getChildren(EXT + key);
}
/**
* Resets a preference to the original value
* @param key (string) Key of the preference
* @return (boolean) Preference reset
*/
function reset(key) {
try {
return prefs.clearUserPref(key);
}
catch (ex) {
// no-op
}
return false;
}
/**
* Resets a preference to the original value (based on branch)
* @param key (string) Key of the preference
* @return (boolean) Preference reset
*/
function resetExt(key) {
if (key.search(new RegExp('/^' + EXT + '/')) != 0) {
key = EXT + key;
}
return reset(key);
}
/**
* Resets a whole branch
* @param branch (string) Branch to reset
*/
function resetBranch(branch) {
try {
prefs.resetBranch(branch);
}
catch (ex) {
// BEWARE: not yet implemented in XPCOM 1.8/trunk.
let children = prefs.getChildList(branch, {});
for each (let key in children) {
reset(key);
}
}
}
/**
* Resets a whole branch (based on extension branch)
* @param branch (string) Branch to reset
*/
function resetBranchExt(branch) {
resetBranch(EXT + branch);
}
/**
* Resets the whole extension branch (aka. restore all)
*/
function resetAllExt() {
resetBranchExt('');
}
/**
* Adds a preference observer
* @param branch (string) Branch to add the preference observer for
* @param obj (object) Preference observer. Must implement observe(). QueryInterface added as required.
* @return
*/
function addObserver(branch, obj) {
makeObserver(obj);
prefs.QueryInterface(nsIPrefBranch2).addObserver(branch, obj, true);
return function() removeObserver(branch, obj);
}
/**
* Removes a preference observer again
* @param branch (string) Branch to add the preference observer for
* @param obj (object) Preference observer. Must have been added before
*/
function removeObserver(branch, obj) {
prefs.QueryInterface(nsIPrefBranch2).removeObserver(branch, obj);
}
/**
* Converts/encapsulates object into weak nsIObserser.
* Object must already implement observe().
* Object may already implement QueryInterface
* @param obj (object) Object to convert
*/
function makeObserver(obj) {
try {
if (
obj.QueryInterface(Ci.nsISupportsWeakReference)
&& obj.QueryInterface(Ci.nsIObserver)
) {
return;
}
}
catch (ex) {
// fall-through
}
// Need to convert/encapsulate object
// Store old QI
let __QueryInterface = obj.QueryInterface;
// Rewrite QI to support required interfaces
obj.QueryInterface = function(iid) {
if (
iid.equals(Components.interfaces.nsISupports)
|| iid.equals(Components.interfaces.nsISupportsWeakReference)
|| iid.equals(Components.interfaces.nsIWeakReference)
|| iid.equals(Components.interfaces.nsIObserver)
) {
return obj;
}
if (__QueryInterface) {
return __QueryInterface.call(this, iid);
}
throw Components.results.NS_ERROR_NO_INTERFACE;
};
// nsiWeakReference
obj.QueryReferent = function(iid) {
return obj.QueryInterface(iid);
};
// nsiSupportsWeakReference
obj.GetWeakReference = function() {
return obj;
};
}
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