Class: ChainOfResponsibility::Handler

Inherits:
Object
  • Object
show all
Defined in:
lib/chain_of_responsibility/handler.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(successor = MissingSuccessor.new) ⇒ Handler

Returns a new instance of Handler.



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# File 'lib/chain_of_responsibility/handler.rb', line 8

def initialize(successor = MissingSuccessor.new)
  @successor = successor
end

Instance Attribute Details

#successor ⇒ Object (readonly)

Returns the value of attribute successor.



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# File 'lib/chain_of_responsibility/handler.rb', line 12

def successor
  @successor
end

Instance Method Details

#applicable? ⇒ Boolean

Returns:

  • (Boolean)

Raises:



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# File 'lib/chain_of_responsibility/handler.rb', line 26

def applicable?(*)
  raise MethodNotImplementedError, "applicable?"
end

#call(*args) ⇒ Object 



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# File 'lib/chain_of_responsibility/handler.rb', line 14

def call(*args)
  if applicable?(*args)
    resolve(*args)
  else
    successor.call(*args)
  end
end

#resolve ⇒ Object

Raises:



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# File 'lib/chain_of_responsibility/handler.rb', line 22

def resolve(*)
  raise MethodNotImplementedError, "resolve"
end