Class: SimpleDelegator
Overview
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_ .
Constant Summary
Constants inherited from Delegator
Instance Method Summary collapse
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#__getobj__ ⇒ Object
Returns the current object method calls are being delegated to.
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#__setobj__(obj) ⇒ Object
Changes the delegate object to obj.
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#clone ⇒ Object
Clone support for the object returned by _getobj_.
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#dup ⇒ Object
Duplication support for the object returned by _getobj_.
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#initialize(obj) ⇒ SimpleDelegator
constructor
Pass in the obj you would like to delegate method calls to.
Methods inherited from Delegator
#marshal_dump, #marshal_load, #method_missing, #respond_to?
Constructor Details
#initialize(obj) ⇒ SimpleDelegator
Pass in the obj you would like to delegate method calls to.
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# File 'lib/delegate.rb', line 199 def initialize(obj) super @_sd_obj = obj end |
Dynamic Method Handling
This class handles dynamic methods through the method_missing method in the class Delegator
Instance Method Details
#__getobj__ ⇒ Object
Returns the current object method calls are being delegated to.
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# File 'lib/delegate.rb', line 205 def __getobj__ @_sd_obj end |
#__setobj__(obj) ⇒ Object
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
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# File 'lib/delegate.rb', line 223 def __setobj__(obj) raise ArgumentError, "cannot delegate to self" if self.equal?(obj) @_sd_obj = obj end |
#clone ⇒ Object
Clone support for the object returned by _getobj_.
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# File 'lib/delegate.rb', line 229 def clone new = super new.__setobj__(__getobj__.clone) new end |
#dup ⇒ Object
Duplication support for the object returned by _getobj_.
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# File 'lib/delegate.rb', line 235 def dup new = super new.__setobj__(__getobj__.clone) new end |