Created
November 4, 2012 09:00
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Strategy Pattern in Ruby
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| class Formatter | |
| def output_report(title, text) | |
| raise 'Called abstract method !!' | |
| end | |
| end | |
| class HTMLFormatter < Formatter | |
| def output_report(report) | |
| puts "<html><head><title>#{report.title}</title></head>" | |
| puts '<body>' | |
| report.text.each do |line| | |
| puts "<p>#{line}</p>" | |
| end | |
| puts '</body></html>' | |
| end | |
| end | |
| class PlainTextFormatter < Formatter | |
| def output_report(report) | |
| puts "*** #{report.title} ***" | |
| report.text.each do |line| | |
| puts(line) | |
| end | |
| end | |
| end | |
| class Report | |
| attr_reader :title, :text | |
| attr_accessor :formatter | |
| def initialize(formatter) | |
| @title = 'report title' | |
| @text = ['text1', 'text2', 'text3'] | |
| @formatter = formatter | |
| end | |
| def output_report | |
| @formatter.output_report(self) | |
| end | |
| end | |
| report = Report.new(HTMLFormatter.new) | |
| report.output_report | |
| # <html><head><title>report title</title></head> | |
| # <body> | |
| # <p>text1</p> | |
| # <p>text2</p> | |
| # <p>text3</p> | |
| # </body></html> | |
| report.formatter = PlainTextFormatter.new | |
| report.output_report | |
| # *** report title *** | |
| # text1 | |
| # text2 | |
| # text3 |
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