代理模式
需求：
小明让小李替他追小丽（送洋娃娃，送花，送巧克力）
没有代理的代码：
# -*- encoding: utf-8 -*-
#追求者类
class Pursuit
attr_accessor :mm
def initialize(mm)
@mm = mm
end
def give_dolls
puts "#{mm.name} 送你洋娃娃"
end
def give_flowers
puts "#{mm.name} 送你鲜花"
end
def give_chocolate
puts "#{mm.name} 送你巧克力"
end
end
#被追求者类
class Girl
attr_accessor :name
def initialize(name)
@name = name
end
end
xiao_hong = Girl.new('小红')
xiao_ming = Pursuit.new(xiao_hong)
xiao_ming.give_dolls
xiao_ming.give_flowers
xiao_ming.give_chocolate
只有代理的代码：
# -*- encoding: utf-8 -*-
#代理类
class Proxy
attr_accessor :mm
def initialize(mm)
@mm = mm
end
def give_dolls
puts "#{mm.name} 送你洋娃娃"
end
def give_flowers
puts "#{mm.name} 送你鲜花"
end
def give_chocolate
puts "#{mm.name} 送你巧克力"
end
end
#被追求者类
class Girl
attr_accessor :name
def initialize(name)
@name = name
end
end
xiao_hong = Girl.new('小红')
xiao_ming = Proxy.new(xiao_hong)
xiao_ming.give_dolls
xiao_ming.give_flowers
xiao_ming.give_chocolate
只是把追求者类换成了代理类。
实际的代理模式代码：
# -*- encoding: utf-8 -*-
#公共接口module
module GiveGift
def give_dolls
end
def give_flowers
end
def give_chocolate
end
end
#追求者类
class Pursuit
include GiveGift
attr_accessor :mm, :name
def initialize(mm)
@mm = mm
end
def give_dolls
puts "#{mm.name} 替#{name}送你洋娃娃"
end
def give_flowers
puts "#{mm.name} 替#{name}送你鲜花"
end
def give_chocolate
puts "#{mm.name} 替#{name}送你巧克力"
end
end
#代理类
class Proxy
include GiveGift
attr_accessor :gg
def initialize(mm)
@gg = Pursuit.new(mm)
end
def give_dolls
gg.give_dolls
end
def give_flowers
gg.give_flowers
end
def give_chocolate
gg.give_chocolate
end
end
#被追求者类
class Girl
attr_accessor :name
def initialize(name)
@name = name
end
end
xiao_hong = Girl.new('小红')
xiao_ming = Proxy.new(xiao_hong)
xiao_ming.gg.name = '小明'
xiao_ming.give_dolls
xiao_ming.give_flowers
xiao_ming.give_chocolate
装饰模式
需求：
给人搭配不同的服饰
代码版本一
# -*- encoding: utf-8 -*-
class Person
attr_accessor :name
def initialize(name)
@name = name
end
def wear_t_shirts
puts '大T恤'
end
def wear_big_trouser
puts '垮裤'
end
def wear_sneakers
puts '破球鞋'
end
def wear_suit
puts '西装'
end
def wear_tie
puts '领带'
end
def wear_leather_shoes
puts '皮鞋'
end
def show
puts "*****装扮的#{name}\n\n"
end
end
xc=Person.new('小菜')
puts "******第一种装扮"
xc.wear_t_shirts
xc.wear_big_trouser
xc.wear_sneakers
xc.show
puts "******第二种装扮"
xc.wear_suit
xc.wear_tie
xc.wear_leather_shoes
xc.show
这样写的话，功能是实现了，问题是如果增加“超人”的装扮，就要修改Person类，违反了开放-封闭原则。
代码版本二
# -*- encoding: utf-8 -*-
class Person
attr_accessor :name
def initialize(name)
@name = name
enddef show
puts "*****装扮的#{name}\n\n"
end
end
class Finery
def show
end
end
class TShirts Finery
def show
puts '大T恤'
end
end
class BigTrouser Finery
def show
puts '垮裤'
end
end
class Sneakers Finery
def show
puts '破球鞋'
end
end
class Suit Finery
def show
puts '西装'
end
end
class Tie Finery
def show
puts '领带'
end
end
class LeatherShoes Finery
def show
puts '皮鞋'
end
end
xc=Person.new('小菜')
ts = TShirts.new
bt = BigTrouser.new
sk = Sneakers.new
puts "******第一种装扮"
ts.show
bt.show
sk.show
xc.show
suit = Suit.new
tie = Tie.new
ls = LeatherShoes.new
puts "******第二种装扮"
suit.show
tie.show
ls.show
xc.show
这样改了之后，如果增加超人装扮，确实不需要去修改Person类。存在的问题是，各种衣服是独立的，并且暴露在外边的，就是一件一件穿的，没有顺序，没有控制。
代码版本三
# -*- encoding: utf-8 -*-
class Person
attr_accessor :name
def initialize(name=nil)
@name = name
end
def show
puts "*****装扮的#{name}\n\n"
end
end
class Finery Person
attr_accessor :componet
def decorate(componet)
@componet = componet
end
def show
componet.show if componet
end
end
class TShirts Finery
def show
super
puts '大T恤'
end
end
class BigTrouser Finery
def show
super
puts '垮裤'
end
end
class Sneakers Finery
def show
super
puts '破球鞋'
end
end
class Suit Finery
def show
super
puts '西装'
end
end
class Tie Finery
def show
super
puts '领带'
end
end
class LeatherShoes Finery
def show
super
puts '皮鞋'
end
end
xc=Person.new('小菜')
ts = TShirts.new
bt = BigTrouser.new
sk = Sneakers.new
puts "******第一种装扮"
ts.decorate xc
bt.decorate ts
sk.decorate bt
sk.show
suit = Suit.new
tie = Tie.new
ls = LeatherShoes.new
puts "******第二种装扮"
suit.decorate xc
tie.decorate suit
ls.decorate bt
ls.show
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