Class: NullChainer

Inherits:
BasicObject
Defined in:
lib/nullobject_chain.rb

Class Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(obj) ⇒ NullChainer

Returns a new instance of NullChainer.



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# File 'lib/nullobject_chain.rb', line 7

def initialize(obj)
  @obj = obj
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(name, *args, &block) ⇒ Object 



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# File 'lib/nullobject_chain.rb', line 19

def method_missing(name, *args, &block)
  begin
    ::NullChainer.new(@obj.send(name, *args, &block))
  rescue ::NoMethodError
    if @obj.nil?
      ::NullChainer.new(nil)
    else
      raise $!
    end
  end
end

Class Attribute Details

.use_nullobject ⇒ Object

Returns the value of attribute use_nullobject.



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# File 'lib/nullobject_chain.rb', line 3

def use_nullobject
  @use_nullobject
end

Instance Method Details

#get ⇒ Object 



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# File 'lib/nullobject_chain.rb', line 11

def get
  if @obj.is_a?(::NilClass) && ::NullChainer.use_nullobject
    ::Null::Object.instance
  else
    @obj
  end
end