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Update Observers js module to latest version

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This commit is contained in:
Dan Mills 2008-11-03 14:40:28 -08:00
parent bf42503d89
commit 3de7d24138
1 changed files with 11 additions and 5 deletions
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16
services/sync/modules/Observers.js
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@ -56,8 +56,10 @@ let Observers = {
remove: function(callback, topic) {
let observer = Observers._observers[topic][callback];
Observers._service.removeObserver(observer, topic);
delete this._observers[topic][callback];
if (observer) {
Observers._service.removeObserver(observer, topic);
delete this._observers[topic][callback];
}
},
notify: function(subject, topic, data) {
@ -67,6 +69,8 @@ let Observers = {
_service: Cc["@mozilla.org/observer-service;1"].
getService(Ci.nsIObserverService),
// Observers indexed by callback. This lets us get the observer
// to remove when a caller calls |remove|, passing it a callback.
_observers: {}
};
@ -81,10 +85,12 @@ Observer.prototype = {
// Pass the wrappedJSObject for subjects that have one. Otherwise pass
// the subject itself. This way we support both wrapped subjects created
// using this module and those that are real XPCOM components.
if (subject && subject.wrappedJSObject)
this._callback(subject.wrappedJSObject, topic, data);
let unwrappedSubject = subject.wrappedJSObject || subject;
if (typeof this._callback == "function")
this._callback(unwrappedSubject, topic, data);
else
this._callback(subject, topic, data);
this._callback.observe(unwrappedSubject, topic, data);
}
}