Created
November 4, 2012 09:40
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Strategy Pattern and Proc Object in Ruby
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| 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.call(self) | |
| end | |
| end | |
| HTML_FORMATTER = lambda do |context| | |
| puts "<html><head><title>#{context.title}</title></head>" | |
| puts '<body>' | |
| context.text.each do |line| | |
| puts "<p>#{line}</p>" | |
| end | |
| puts '</body></html>' | |
| end | |
| report = Report.new(&HTML_FORMATTER) | |
| report.output_report | |
| # <html><head><title>report title</title></head> | |
| # <body> | |
| # <p>text1</p> | |
| # <p>text2</p> | |
| # <p>text3</p> | |
| # </body></html> | |
| PLAIN_FORMATTER = lambda do |context| | |
| puts "*** #{report.title} ***" | |
| report.text.each do |line| | |
| puts(line) | |
| end | |
| end | |
| report.formatter = PLAIN_FORMATTER | |
| report.output_report | |
| # *** report title *** | |
| # text1 | |
| # text2 | |
| # text3 |
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