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module ActiveModel
module StateMachine
class Event
attr_reader :name, :success
def initialize(machine, name, options = {}, &block)
@machine, @name, @transitions = machine, name, []
if machine
machine.klass.send(:define_method, "#{name}!") do |*args|
machine.fire_event(name, self, true, *args)
end
machine.klass.send(:define_method, name.to_s) do |*args|
machine.fire_event(name, self, false, *args)
end
end
update(options, &block)
end
def fire(obj, to_state = nil, *args)
transitions = @transitions.select { |t| t.from == obj.current_state(@machine ? @machine.name : nil) }
raise InvalidTransition if transitions.size == 0
next_state = nil
transitions.each do |transition|
next if to_state && !Array(transition.to).include?(to_state)
if transition.perform(obj)
next_state = to_state || Array(transition.to).first
transition.execute(obj, *args)
break
end
end
next_state
end
def transitions_from_state?(state)
@transitions.any? { |t| t.from? state }
end
def ==(event)
if event.is_a? Symbol
name == event
else
name == event.name
end
end
def update(options = {}, &block)
if options.key?(:success) then @success = options[:success] end
if block then instance_eval(&block) end
self
end
private
def transitions(trans_opts)
Array(trans_opts[:from]).each do |s|
@transitions << StateTransition.new(trans_opts.merge({:from => s.to_sym}))
end
end
end
end
end
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