Class: Transitions::Event

Inherits:
Object
  • Object
show all
Defined in:
lib/transitions/event.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(machine, name, options = {}, &block) ⇒ Event

Returns a new instance of Event.



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# File 'lib/transitions/event.rb', line 5

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

    machine.klass.send(:define_method, "can_#{name}?") do |*_args|
      machine.events_for(current_state).include?(name.to_sym)
    end

    machine.klass.send(:define_method, "can_execute_#{name}?") do |*args|
      event = name.to_sym

      send("can_#{name}?", *args) &&
        machine.events[event].can_execute_transition_from_state?(current_state, self, *args)
    end
  end
  update(options, &block)
end

Instance Attribute Details

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/transitions/event.rb', line 3

def name
  @name
end

#success ⇒ Object (readonly)

Returns the value of attribute success.



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# File 'lib/transitions/event.rb', line 3

def success
  @success
end

#timestamp ⇒ Object

Returns the value of attribute timestamp.



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# File 'lib/transitions/event.rb', line 3

def timestamp
  @timestamp
end

Instance Method Details

#==(event) ⇒ Object 



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# File 'lib/transitions/event.rb', line 56

def ==(event)
  if event.is_a? Symbol
    name == event
  else
    name == event.name
  end
end

#can_execute_transition_from_state?(state, obj, *args) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/transitions/event.rb', line 52

def can_execute_transition_from_state?(state, obj, *args)
  @transitions.select { |t| t.from? state }.any? { |t| t.executable?(obj, *args) }
end

#fire(obj, to_state = nil, *args) ⇒ Object 



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# File 'lib/transitions/event.rb', line 30

def fire(obj, to_state = nil, *args)
  transitions = @transitions.select { |t| t.from == obj.current_state }
  fail InvalidTransition, error_message_for_invalid_transitions(obj) if transitions.size == 0

  next_state = nil
  transitions.each do |transition|
    next if to_state && !Array(transition.to).include?(to_state)
    if transition.executable?(obj, *args)
      next_state = to_state || Array(transition.to).first
      transition.execute(obj, *args)
      update_event_timestamp(obj, next_state) if timestamp_defined?
      break
    end
  end
  # Update timestamps on obj if a timestamp has been defined
  next_state
end

#timestamp_defined? ⇒ Boolean

Has the timestamp option been specified for this event?

Returns:

  • (Boolean) 


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# File 'lib/transitions/event.rb', line 65

def timestamp_defined?
  !@timestamp.nil?
end

#transitions_from_state?(state) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/transitions/event.rb', line 48

def transitions_from_state?(state)
  @transitions.any? { |t| t.from? state }
end

#update(options = {}, &block) ⇒ Object 



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# File 'lib/transitions/event.rb', line 69

def update(options = {}, &block)
  @success       = build_success_callback(options[:success]) if options.key?(:success)
  self.timestamp = options[:timestamp] if options[:timestamp]
  instance_eval(&block) if block
  self
end

#update_event_timestamp(obj, next_state) ⇒ Object

update the timestamp attribute on obj



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# File 'lib/transitions/event.rb', line 77

def update_event_timestamp(obj, next_state)
  obj.send "#{timestamp_attribute_name(obj, next_state)}=", Time.now
end