Class: Statemachine::Transition

Inherits:
Object
  • Object
show all
Defined in:
lib/statemachine/transition.rb

Overview

:nodoc:

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(origin_id, destination_id, event, action) ⇒ Transition

Returns a new instance of Transition.



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# File 'lib/statemachine/transition.rb', line 8

def initialize(origin_id, destination_id, event, action)
  @origin_id = origin_id
  @destination_id = destination_id
  @event = event
  @action = action
end

Instance Attribute Details

#action ⇒ Object (readonly)

Returns the value of attribute action.



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# File 'lib/statemachine/transition.rb', line 5

def action
  @action
end

#destination_id ⇒ Object

Returns the value of attribute destination_id.



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# File 'lib/statemachine/transition.rb', line 6

def destination_id
  @destination_id
end

#event ⇒ Object (readonly)

Returns the value of attribute event.



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# File 'lib/statemachine/transition.rb', line 5

def event
  @event
end

#origin_id ⇒ Object (readonly)

Returns the value of attribute origin_id.



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# File 'lib/statemachine/transition.rb', line 5

def origin_id
  @origin_id
end

Instance Method Details

#exits_and_entries(origin, destination) ⇒ Object 



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# File 'lib/statemachine/transition.rb', line 35

def exits_and_entries(origin, destination)
  return [], [] if origin == destination
  exits = []
  entries = exits_and_entries_helper(exits, origin, destination)
  return exits, entries.reverse
end

#invoke(origin, statemachine, args) ⇒ Object 



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# File 'lib/statemachine/transition.rb', line 15

def invoke(origin, statemachine, args)
  destination = statemachine.get_state(@destination_id)
  exits, entries = exits_and_entries(origin, destination)
  exits.each { |exited_state| exited_state.exit(args) }
  
  if @action
    result = origin.statemachine.invoke_action(@action, args, "transition action from #{origin} invoked by '#{@event}' event") if @action
    transition = !(result === false)
  else
    transition = true
  end
  
  if transition
    terminal_state = entries.last
    terminal_state.activate if terminal_state

    entries.each { |entered_state| entered_state.enter(args) }
  end
end

#to_s ⇒ Object 



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# File 'lib/statemachine/transition.rb', line 42

def to_s
  return "#{@origin_id} ---#{@event}---> #{@destination_id} : #{action}"
end