using System;

using System.Collections.Generic;

​

// classes I can not touch

class GenericDataType {}

class ProductDataType : GenericDataType {}

class ContentDataType : GenericDataType {}

​

// bridges

class ParserdType {}

class ParserdTypeProduct : ParserdType{}

class ParserdTypeContent : ParserdType{}

​

​

// builds bridges

class DataTypearser {

   public List<ParserdType> parseAll(List<GenericDataType> list) {

      var resultList = new List<ParserdType>();

      foreach(var item in list) {

          var parsed = parse(item);

          if(parsed != null){

              resultList.Add(parsed);

          }

      }

      return resultList; 

   }

   public ParserdType parse(ContentDataType o) {

      // do something

      // ...

      Console.WriteLine("doing something");

      return new ParserdTypeProduct();

   }

   public ParserdType parse(ProductDataType o) {

      // do something else

      // ...

      Console.WriteLine("doing something else");

      return new ParserdTypeContent();

   }

   public ParserdType parse(GenericDataType o) {

      Console.WriteLine("doing nothing");

      return null;

   }

   public ParserdType parse(object o) {

      Console.WriteLine("alé");

      return null;

   }

}

​

​

public class Program

{

    public static void Main()

    {

        var list = new List<GenericDataType>{

            new GenericDataType(),

            new ProductDataType(),

            new ContentDataType(),

        };

        var parser = new DataTypearser();

        parser.parseAll(list);

    }

}