Sharing Data between the Context and the Strategy : Strategy « Design Patterns « Ruby






  1. Ruby
  2. Design Patterns
  3. Strategy

Sharing Data between the Context and the Strategy


class Document
  attr_reader :title, :text

  attr_accessor :formatter

  def initialize(formatter)
    @title = 'Document'
    @text =  ['Things are going', ' well.']
    @formatter = formatter
  end

  def output_report
    @formatter.output_report(self)
  end
end

class Formatter
  def output_report(context)
    raise 'Abstract method called'
  end
end

class HTMLFormatter < Formatter
  def output_report(context)
    puts('<html>')
    puts('  <head>')
    puts("    <title>#{context.title}</title>")
    puts('  </head>')
    puts('  <body>')
    context.text.each do |line|
      puts("    <p>#{line}</p>")
    end
    puts('  </body>')
    puts('</html>')
  end
end








Related examples in the same category

1.Replacing the Algorithm with the Strategy
2.Strategy pattern with Ruby dynamic attributes