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Contents
# This class delegates method calls to the given object.
# If the returned value is an instance of the original object,
# the smart delegator will return a new instance of itself with
# the original object.
#
# This is in contrast to SimpleDelegator which will return the
# original object.
#
# The chart below demonstrates the difference:
#
# `mymessage` ->
# SimpleDelegator ->
# OriginalObject ->
# invokes `mymessage` returning self ->
# returns OriginalObject
# `mymessage` ->
# SmartDelegator ->
# OriginalObject ->
# invokes `mymessage` returning self ->
# returns SmartDelegator decorating OriginalObject
class SmartDelegator
attr_reader :object
def initialize(object)
@object = object
end
def respond_to?(method, include_private = false)
super || object.respond_to?(method, include_private)
end
def inspect
"SmartDelegator(#{object.inspect})"
end
def method_missing(method, *args, &block)
returned_object = object.public_send(method, *args, &block)
if returned_object.class == object.class
self.class.new(returned_object)
else
returned_object
end
end
end
Version data entries
8 entries across 8 versions & 1 rubygems