RussOlsenTemplateMethod
Refactoringの順序
- 初期code(p.55)を入力
- legacy code(p.56)を入力
- p.60まで読む
- p.68にならいrefactor開始
- p.68を３枚print outして，下記に書き換え
- Report (Abstract class)
- HTMLReport < Report (Concrete class I)
- PlainTextReport < Report (Concrete class II)
- raise, hook, concrete methodを峻別
- そのとおりにrefactoring, まちがってたらraiseが起こる．
template55.rb
class Report
def initialize
@title = '月次報告'
@text = ['順調','さいこ〜〜〜']
end
def output_report
puts '<html>'
puts ' <head>'
puts ' <meta charset="UTF-8">'
puts " <title>#{@title}</title>"
puts ' </head>'
puts ' <body>'
@text.each{|line|
puts(" <p>#{line}</p>")
}
puts ' </body>'
puts '</html>'
end
end
report = Report.new
report.output_report
template68.rb
No.4のHTMLのrefactor修了後，これを３枚印刷
class Report
def initialize
@title = '月次報告'
@text = ['順調','さいこ〜〜〜']
end
def output_report
output_start
output_head
output_body_start
output_body
output_body_end
output_end
end
def output_start
puts ' <html>'
end
def output_head
puts ' <head>'
puts ' <meta charset="UTF-8">'
puts " <title>#{@title}</title>"
puts ' </head>'
end
def output_body_start
puts ' <body>'
end
def output_body
@text.each{|line|
output_line(line)
}
end
def output_line(line)
puts " <p>#{line}</p>"
end
def output_body_end
puts ' </body>'
end
def output_end
puts '</html>'
end
endtemplate61-1.rb(最終版)
class Report
def initialize
@title = '月次報告'
@text = ['順調','さいこ〜〜〜']
end
def output_report
output_start
output_head
output_body_start
output_body
output_body_end
output_end
end
def output_start; end
def output_head
raise 'Called absract method: output_head'
end
def output_body_start; end
def output_body
@text.each{|line|
output_line(line)
}
end
def output_line(line)
raise 'Called absract method: output_line'
end
def output_body_end; end
def output_end; end
end
class HTMLReport < Report
def output_start
puts ' <html>'
end
def output_head
puts ' <head>'
puts ' <meta charset="UTF-8">'
puts " <title>#{@title}</title>"
puts ' </head>'
end
def output_body_start
puts ' <body>'
end
def output_line(line)
puts " <p>#{line}</p>"
end
def output_body_end
puts ' </body>'
end
def output_end
puts '</html>'
end
end
class PlainTextReport < Report
def output_head
puts "***#{@title}***"
end
def output_line(line)
puts "#{line}"
end
end
report = HTMLReport.new
report.output_report
report = PlainTextReport.new
report.output_report
Keyword(s):
References:[MultiScale14]