Class: Rule::Engine::State

Inherits:
Object
  • Object
show all
Defined in:
lib/rule/engine/state.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name) ⇒ State

Returns a new instance of State.



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# File 'lib/rule/engine/state.rb', line 7

def initialize(name)
  @name = name
  @transitions = []
end

Instance Attribute Details

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/rule/engine/state.rb', line 5

def name
  @name
end

Instance Method Details

#add_transition(to, blk) ⇒ Object 



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# File 'lib/rule/engine/state.rb', line 12

def add_transition(to, blk)
  @transitions << Transition.new(self, to, blk)
end

#next_state(object) ⇒ Object 



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# File 'lib/rule/engine/state.rb', line 28

def next_state(object)
  transitions = valid_transitions(object)
  if transitions.any?
    return transitions.
      sort_by{|transition| transition.instance_variable_get("@priority")}.
      last.
      to_state
  else 
    return self
  end 
end

#valid_transitions(object) ⇒ Object 



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# File 'lib/rule/engine/state.rb', line 16

def valid_transitions(object)
  @transitions.map { |transition|
    begin
      transition.run!(object)
    rescue Rule::Engine::InvalidTransition
      nil
    else 
      transition
    end 
  }.compact
end