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Ruby使用設(shè)計(jì)模式中的代理模式與裝飾模式的代碼實(shí)例

 更新時(shí)間:2016年03月16日 12:02:11   作者:范孝鵬  
這篇文章主要介紹了Ruby使用設(shè)計(jì)模式中的代理模式與裝飾模式的代碼實(shí)例,代理模式與裝飾模式都可以歸類為結(jié)構(gòu)型的設(shè)計(jì)模式,需要的朋友可以參考下

代理模式

需求:

小明讓小李替他追小麗(送洋娃娃,送花,送巧克力)

沒有代理的代碼:

# -*- encoding: utf-8 -*-

#追求者類
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} 送你鮮花"
 end
 
 def give_chocolate
  puts "#{mm.name} 送你巧克力"
 end

end

#被追求者類
class Girl
 attr_accessor :name
 
 def initialize(name)
  @name = name
 end
end

xiao_hong = Girl.new('小紅')

xiao_ming = Pursuit.new(xiao_hong)
xiao_ming.give_dolls
xiao_ming.give_flowers
xiao_ming.give_chocolate

只有代理的代碼:

# -*- encoding: utf-8 -*-

#代理類
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} 送你鮮花"
 end
 
 def give_chocolate
  puts "#{mm.name} 送你巧克力"
 end

end

#被追求者類
class Girl
 attr_accessor :name
 
 def initialize(name)
  @name = name
 end
end

xiao_hong = Girl.new('小紅')

xiao_ming = Proxy.new(xiao_hong)
xiao_ming.give_dolls
xiao_ming.give_flowers
xiao_ming.give_chocolate

只是把追求者類換成了代理類。

實(shí)際的代理模式代碼:

# -*- encoding: utf-8 -*-

#公共接口module
module GiveGift
 def give_dolls
 end
 
 def give_flowers
 end
 
 def give_chocolate
 end
end

#追求者類
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}送你鮮花"
 end
 
 def give_chocolate
  puts "#{mm.name} 替#{name}送你巧克力"
 end

end

#代理類
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

#被追求者類
class Girl
 attr_accessor :name
 
 def initialize(name)
  @name = name
 end
end

xiao_hong = Girl.new('小紅')

xiao_ming = Proxy.new(xiao_hong)
xiao_ming.gg.name = '小明'
xiao_ming.give_dolls
xiao_ming.give_flowers
xiao_ming.give_chocolate


裝飾模式
 
需求:

給人搭配不同的服飾

代碼版本一

# -*- 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 '垮褲'
 end
 
 def wear_sneakers
  puts '破球鞋'
 end
 
 def wear_suit
  puts '西裝'
 end
 
 def wear_tie
  puts '領(lǐng)帶'
 end
 
 def wear_leather_shoes
  puts '皮鞋'
 end
 
 def show
  puts "*****裝扮的#{name}\n\n"
 end

end


xc=Person.new('小菜')
puts "******第一種裝扮"
xc.wear_t_shirts
xc.wear_big_trouser
xc.wear_sneakers
xc.show

puts "******第二種裝扮"
xc.wear_suit
xc.wear_tie
xc.wear_leather_shoes
xc.show

這樣寫的話,功能是實(shí)現(xiàn)了,問題是如果增加“超人”的裝扮,就要修改Person類,違反了開放-封閉原則。

 

代碼版本二

# -*- encoding: utf-8 -*-

class Person
 attr_accessor :name
 
 def initialize(name)
  @name = name
 enddef show
  puts "*****裝扮的#{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 '垮褲'
 end
end

class Sneakers < Finery
 def show
  puts '破球鞋'
 end
end

class Suit < Finery
 def show
  puts '西裝'
 end
end

class Tie < Finery
 def show
  puts '領(lǐng)帶'
 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 "******第一種裝扮"
ts.show
bt.show
sk.show
xc.show


suit = Suit.new
tie = Tie.new
ls = LeatherShoes.new
puts "******第二種裝扮"
suit.show
tie.show
ls.show
xc.show

這樣改了之后,如果增加超人裝扮,確實(shí)不需要去修改Person類。存在的問題是,各種衣服是獨(dú)立的,并且暴露在外邊的,就是一件一件穿的,沒有順序,沒有控制。

代碼版本三

# -*- encoding: utf-8 -*-

class Person
 attr_accessor :name
 
 def initialize(name=nil)
  @name = name
 end
 
 def show
  puts "*****裝扮的#{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 '垮褲'
 end
end

class Sneakers < Finery
 def show
  super
  puts '破球鞋'
 end
end

class Suit < Finery
 def show
  super
  puts '西裝'
 end
end

class Tie < Finery
 def show
  super
  puts '領(lǐng)帶'
 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 "******第一種裝扮"
ts.decorate xc
bt.decorate ts
sk.decorate bt
sk.show


suit = Suit.new
tie = Tie.new
ls = LeatherShoes.new
puts "******第二種裝扮"
suit.decorate xc
tie.decorate suit
ls.decorate bt
ls.show

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