Module: SubstAttr::Substitute

Extended by:
Substitute
Included in:
Substitute
Defined in:
lib/subst_attr/substitute.rb,
lib/subst_attr/substitute/null_object.rb

Defined Under Namespace

Modules: NullObject

Instance Method Summary collapse

Instance Method Details

#build(interface = nil) ⇒ Object 



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# File 'lib/subst_attr/substitute.rb', line 5

def build(interface=nil)
  if interface
    specialization = specialization(interface)
    return specialization if specialization
  end

  return NullObject.build(interface)
end

#call(attr_name, receiver) ⇒ Object 



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# File 'lib/subst_attr/substitute.rb', line 14

def call(attr_name, receiver)
  interface = receiver.send(attr_name).class
  substitute = build(interface)
  receiver.send :"#{attr_name}=", substitute
  substitute
end

#specialization(interface) ⇒ Object 



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# File 'lib/subst_attr/substitute.rb', line 21

def specialization(interface)
  constant_name = :Substitute

  reflection = Reflect.(interface, constant_name, strict: false, ancestors: true)

  if reflection.nil?
    return nil
  end

  specialization_module = reflection.constant

  if specialization_module.equal?(self)
    return nil
  end

  unless specialization_module.respond_to?(:build)
    return nil
  end

  specialization_module.send(:build)
end