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  • delegate.rb

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SimpleDelegator

A concrete implementation of Delegator, this class provides the means to delegate all supported method calls to the object passed into the constructor and even to change the object being delegated to at a later time with _setobj_ .

Public Class Methods

new(obj) click to toggle source

Pass in the obj you would like to delegate method calls to.

 
               # File delegate.rb, line 200
def initialize(obj)
  super
  @_sd_obj = obj
end

Public Instance Methods

__getobj__() click to toggle source

Returns the current object method calls are being delegated to.

 
               # File delegate.rb, line 206
def __getobj__
  @_sd_obj
end
__setobj__(obj) click to toggle source

Changes the delegate object to obj.

It's important to note that this does not cause SimpleDelegator's methods to change. Because of this, you probably only want to change delegation to objects of the same type as the original delegate.

Here's an example of changing the delegation object.

names = SimpleDelegator.new(%w{James Edward Gray II})
puts names[1]    # => Edward
names.__setobj__(%w{Gavin Sinclair})
puts names[1]    # => Sinclair

 
               # File delegate.rb, line 224
def __setobj__(obj)
  raise ArgumentError, "cannot delegate to self" if self.equal?(obj)
  @_sd_obj = obj
end
clone() click to toggle source

Clone support for the object returned by _getobj_.

 
               # File delegate.rb, line 230
def clone
  new = super
  new.__setobj__(__getobj__.clone)
  new
end
dup() click to toggle source

Duplication support for the object returned by _getobj_.

 
               # File delegate.rb, line 236
def dup
  new = super
  new.__setobj__(__getobj__.clone)
  new
end