Acts as Java Class Variable

contagion (ZuNien Lin) — Mon, 06 Aug 2007 03:47:25 GMT

// Ruby's Class Variable is soooooooooooooooo confusing
// http://www.oreillynet.com/ruby/blog/2007/01/nubygems_dont_use_class_variab_1.html
// However, if we use



module JCV

  def self.included(the_class)

    class << the_class

      def acts_like_java_class_variable( *arg)



        the_class = self

        singleton_class = class << self; self; end

        arg.each do |var|

          singleton_class.send :define_method, "#{var}",

                               & lambda{ the_class.send "__real_#{var}"}

          singleton_class.send :define_method, "#{var}=",

                               & lambda{|c| the_class.send "__real_#{var}=",c}

          singleton_class.send :define_method, "__real_#{var}",

                               & lambda{ instance_variable_get "@#{var}"}

          singleton_class.send :define_method, "__real_#{var}=",

                               & lambda{|c| instance_variable_set "@#{var}", c}

        end

      end

    end

  end

end



class A

  include JCV

  acts_like_java_class_variable :count



  @count = 0

  def initialize

    A.count +=1

  end

end

DZone Snippets: ClassVariable code

Acts as Java Class Variable