class IRB::Notifier::CompositeNotifier

#def_notifier.
object you create, sibling notifiers can be initialized with
create a new composite notifier. Using the first composite notifier
The Notifier class provides a class-method Notifier.def_notifier to
the appropriate level for output.
This class will allow you to generate other notifiers, and assign them
intent of representing a leveled notification system for irb.
A class that can be used to create a group of notifier objects with the

def def_notifier(level, prefix = "")

This method returns the newly created instance.

be used as the index of the #notifiers Array.
The given +prefix+ will be assigned to the notifier, and +level+ will

Creates a new LeveledNotifier in the composite #notifiers group. 
def def_notifier(level, prefix = "")
  notifier = LeveledNotifier.new(self, level, prefix)
  @notifiers[level] = notifier
  notifier
end

def initialize(prefix, base_notifier)

+base_notifier+ to use for output.
Create a new composite notifier object with the given +prefix+, and 
def initialize(prefix, base_notifier)
  super
  @notifiers = [D_NOMSG]
  @level_notifier = D_NOMSG
end

def level_notifier=(value)

AbstractNotifier
found in the existing #notifiers Array, or an instance of
An ErrUnrecognizedLevel exception is raised if the given +value+ is not

ErrUndefinedNotifier exception is raised.
If no notifier exists at the index +value+ in the #notifiers Array, an

index +value+ in the #notifiers Array.
When an Integer is given, #level_notifier is set to the notifier at the

#level_notifier is set to the given object.
When the given +value+ is an instance of AbstractNotifier,

Sets the leveled notifier for this object. 
def level_notifier=(value)
  case value
  when AbstractNotifier
    @level_notifier = value
  when Integer
    l = @notifiers[value]
    raise ErrUndefinedNotifier, value unless l
    @level_notifier = l
  else
    raise ErrUnrecognizedLevel, value unless l
  end
end