# Abstract Factoryパターン
#
# Java言語で学ぶデザインパターンと同様の例題をRubyで記述した。
#
# coded by Takehiro Kaga
#
class Item
def initialize(caption)
@caption = caption
end
def makeHTML # abstruct method
end
end
class Link < Item
def initialize(caption, url)
super(caption)
@url = url
end
end
class Tray < Item
def initialize(caption)
@tray = Array.new
super(caption)
end
def add(item)
@tray.push(item)
end
end
class Page
def initialize(title, author)
@title = title
@author = author
@content = Array.new
end
def add(item)
@content.push(item)
end
def output
filename = @title + ".HTML"
@file = File.open(filename, "w")
@file.puts(self.makeHTML) # Pageを継承したクラスのmakeHTMLを使う
@file.close
puts filename + " を作成しました。"
end
def makeHTML # abstruct method
end
end
class Factory
def initialize
@factory = nil
end
def getFactory(classname)
@factory = eval(classname + ".new")
end
def createLink(caption, url) # abstruct method
end
def createTray(caption) # abstruct method
end
def createPage(title, author) # abstruct method
end
end
class ListFactory < Factory
def createLink(caption, url)
ListLink.new(caption, url)
end
def createTray(caption)
ListTray.new(caption)
end
def createPage(title, author)
ListPage.new(title, author)
end
end
class ListLink < Link
def initialize(caption, url)
@caption = caption
@url = url
super(@caption, @url)
end
def makeHTML
" " + @caption + "\n"
end
end
class ListTray < Tray
def initialize(caption)
@caption = caption
super(@caption)
end
def makeHTML
@buffer = ""
@buffer += "\n"
@buffer += @caption + "\n"
@buffer += "\n"
@tray.each {|item| @buffer += item.makeHTML }
@buffer += "
\n"
@buffer += "\n"
@buffer
end
end
class ListPage < Page
def initialize(title, author)
@title = title
@author = author
super(@title, @author)
end
def makeHTML
@buffer = ""
@buffer += "" + @title + "\n"
@buffer += "\n"
@buffer += "" + @title + "
\n"
@buffer += "\n"
@content.each {|item| @buffer += item.makeHTML }
@buffer += "
\n"
@buffer += "
" + @author + ""
@buffer += "\n"
@buffer
end
end
#---------------------------------------------------------------
factory = Factory.new.getFactory("ListFactory")
asahi = factory.createLink("朝日新聞", "http://www.asahi.com/")
yomiuri = factory.createLink("読売新聞", "http://www.yomiuri.co.jp/")
us_yahoo = factory.createLink("Yahoo!", "http://www.yahoo.com/")
jp_yahoo = factory.createLink("Yahoo!Japan", "http://www.yahoo.co.jp/")
excite = factory.createLink("Excite", "http://www.excite.com/")
google = factory.createLink("Google", "http://www.google.com/")
traynews = factory.createTray("新聞")
traynews.add(asahi)
traynews.add(yomiuri)
trayyahoo = factory.createTray("Yahoo!")
trayyahoo.add(us_yahoo)
trayyahoo.add(jp_yahoo)
traysearch = factory.createTray("サーチエンジン")
traysearch.add(trayyahoo)
traysearch.add(excite)
traysearch.add(google)
page = factory.createPage("LinkPage", "加賀赳寛")
page.add(traynews)
page.add(traysearch)
page.output
#--------プログラムはここまで------------------------------
リターン http://www.ceres.dti.ne.jp/~kaga/