Living in the Tech Avalanche Generation

#Product
class FootballTeam

    def team_id?()
        self.hash
    end

    def team_type_name?()
        @team_type_name
    end

    def team_properties?()
        @team_properties
    end

    def initialize(name)
        @team_type_name = name
        @team_properties = Hash.new(“Staff Role does not exist!”)
    end

end

#Builder
module FootballTeamBuilder

    attr_reader :name
    attr_writer :name

    def footy_team?()
        @footy_team
    end

    def build_init()
        @footy_team = FootballTeam.new(name)
    end

    def build_players(number_of_players)
        @footy_team.team_properties?["Players"] = number_of_players
    end

    def build_ball_shape(shape_of_ball)
        @footy_team.team_properties?["ballshape"] = shape_of_ball
    end

    def build_games_per_season(number_of_games)
        @footy_team.team_properties?["games"] = number_of_games
    end

    def print_team_details()

        attributes =  “****************************” +
            “******************************\r\n”

        attributes += “Created a #{name} team with the “ +
            “following attributes :\r\n”

        @footy_team.team_properties?.each { |k,v|
            attributes += k.to_s + ” “ + v.to_s + “\r\n” }

        attributes += “\n***************************” +
            “*******************************\n”

        return attributes
    end

end

#Concrete Builder”
class AustralianRulesFootballTeamBuilder 

    include FootballTeamBuilder

    def build_all()
        self.name = “Aussie Rules”
        build_init()
        build_ball_shape(“Oval”)
        build_games_per_season(22)
        build_players(18)
    end

end

#Concrete Builder
class RugbyLeagueFootballTeamBuilder

    include FootballTeamBuilder

   def build_all()
        self.name = “Rugby League”
        build_init()
        build_ball_shape(“Oval”)
        build_games_per_season(24)
        build_players(13)
    end

end

#Concrete Builder
class SoccerFootballTeamBuilder

    include FootballTeamBuilder

    def build_all()
        self.name = “Soccer”
        build_init()
        build_ball_shape(“Round”)
        build_games_per_season(44)
        build_players(11)
    end

end

#Director Class
class GoverningBody

    def build_football_team(football_team_builder)
        unless football_team_builder.is_a?(FootballTeamBuilder)
            fail NoNewMethodError.new(“Cannot build with arguments that are “ +
                “not FootballTeamBuilder class objects”)
        end
        football_team_builder.build_all
    end

end

 

Here’s our form and its form load event method.

 

def Form1_Load(sender, e)

      #new up a Director
      f = GoverningBody.new

      #new up a concrete builder
      soccer_builder = SoccerFootballTeamBuilder.new

      #go again a second time with another builder
      aussie_rules_builder = AustralianRulesFootballTeamBuilder.new

      #go again a second time with another builder
      rugby_league_builder = RugbyLeagueFootballTeamBuilder.new

      #pass the bulders build to the Director
      f.build_football_team(soccer_builder)
      f.build_football_team(aussie_rules_builder)
      f.build_football_team(rugby_league_builder)

      #store the teams and details in arrays
      @team1 = [soccer_builder.footy_team?.team_type_name?,
        soccer_builder.print_team_details]
      @team2 = [aussie_rules_builder.footy_team?.team_type_name?,
        aussie_rules_builder.print_team_details]
      @team3 = [rugby_league_builder.footy_team?.team_type_name?,
        rugby_league_builder.print_team_details]

      self.listBox1.Items.Add(@team1[0])
      self.listBox1.Items.Add(@team2[0])
      self.listBox1.Items.Add(@team3[0])

end

Used in concert with a Windows::Forms application (with some help from Ruby In Steel) we can build the following user interface to demonstrate our Builder(s) in action. The entire code can be found here and includes all the code and presentations from previous episodes in the series. Next in the series is the last of the creational patterns, the Prototype pattern.