How to extend the provided Trees in Kotlin?

[mohit92]

I want to extend the FileLoggingTree to add a default tag to all the logs but since the class is not open, I can not extend it.

[MFlisar]

Try v5.2.4

It allows you to provide a custom formatter like following:

L.formatter = DefaultFormatter()

You can extend the DefaultFormatter and add a prefix to any log line now.

Following would do what you want:

class MyFormatter: DefaultFormatter()
{
     override fun formatLogPrefix(lumberjackTag: String?, stackData: StackData) : String {
          return "MY-PREFIX-" + super.formatLogPrefix(lumberjackTag, stackData)
     }
}