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# Replace Inheritance with Delegation | |
# http://refactoring.com/catalog/replaceInheritanceWithDelegation.html | |
# class Roster < Array | |
# attr_accessor :title | |
# def to_s | |
# out = "#{title}\n" | |
# each do |item| | |
# out += "#{item}\n" | |
# end | |
# return out | |
# end | |
# end | |
# class Roster | |
# attr_accessor :title | |
# def initialize | |
# @people = Array.new | |
# end | |
# def <<(person) | |
# @people << person | |
# end | |
# def [](index) | |
# @people[index] | |
# end | |
# def size | |
# @people.size | |
# end | |
# def each | |
# @people.each {|p| yield(p)} | |
# end | |
# def to_s | |
# out = "#{title}\n" | |
# each do |item| | |
# out += "#{item}\n" | |
# end | |
# return out | |
# end | |
# end | |
require 'forwardable' | |
class Roster | |
extend Forwardable | |
attr_accessor :title | |
def initialize | |
@people = Array.new | |
end | |
def_delegators :@people, :<<, :[], :size, :each | |
def to_s | |
out = "#{title}\n" | |
each do |item| | |
out += "#{item}\n" | |
end | |
return out | |
end | |
end | |
require 'test/unit' | |
class RosterTest < Test::Unit::TestCase | |
def setup | |
@roster = Roster.new | |
@roster.title = "Employees" | |
@roster << "Joe" | |
end | |
def test_size | |
assert_equal(1, @roster.size) | |
end | |
def test_index | |
assert_equal("Joe", @roster[0]) | |
end | |
def test_to_s | |
assert_equal("Employees\nJoe\n", @roster.to_s) | |
end | |
end |
Author
shepmaster
commented
Oct 2, 2010
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