require 'singleton'
module Mack
module Utils
#
# Provides a convenient way to register items in a map.
#
# ds - july 2008
#
class RegistryMap
include Singleton
include Extlib::Hook
# The list of registered items
attr_reader :registered_items
def initialize # :nodoc:
reset!
end
# Override this method to set the initial state of the registered_items Array.
# By default this list is empty.
def initial_state
{}
end
# Resets the registered_items list to the list specified by the initial_state method.
def reset!
@registered_items = self.initial_state.dup
end
# Adds an object to the list at a specified position. By default the position is last.
def add(tag, klass, position = -1)
@registered_items[tag] ||= []
arr = self.registered_items[tag]
position = arr.size if position == -1
arr.insert(position, klass)
arr.uniq!
arr.compact!
end
# Removes an object from the list.
def remove(tag, klass)
return false if @registered_items[tag] == nil
self.registered_items[tag].delete(klass)
end
class << self
# Returns the list of registered items.
def registered_items
self.instance.registered_items
end
# Emptys out the list of registered_items.
def clear!
registered_items.clear
end
# Resets the registered_items list to the list specified by the initial_state method.
def reset!
self.instance.reset!
end
# Adds an object to the list at a specified position. By default the position is last.
def add(tag, klass, position = -1)
self.instance.add(tag, klass, position)
end
# Removes an object from the list.
def remove(tag, klass)
self.instance.remove(tag, klass)
end
# Moves an object to the top of the registered_items list.
def move_to_top(tag, klass)
self.instance.add(tag, klass, 0)
end
# Moves an object to the bottom of the registered_items list.
def move_to_bottom(tag, klass)
remove(tag, klass)
self.instance.add(tag, klass)
end
end
end # RegistryMap
end # Utils
end # Mack
