Serialize Cart

In a language that supports OOP paradigm, we have the following code that serializes the content of a shopping cart to JSON format:

class ShoppingCart
  private content : Dictionary<int, string> 

  public function serialize() : string
    return new JsonSerializer().serialize(content.clone())
  end function
end class

class JsonSerializer  
  public function serialize(value : Dictionary<int, string>) : string
    ' Code that serializes dictionary to JSON format and returns it as string
  end function
end class

A client wants to have the possibility of allowing loosely coupled plugins to be able to serialize the shopping cart content to their own formats (e.g., XML). Select lines of code that, together, would extend the code above to allow this.

(Select all acceptable answers.)

class JsonSerializer

Should be changed to:

class JsonSerializer inherits ISerializer

Add interface definition:

interface ISerializer
  public function serialize(Dictionary<int, string>) : string
end interface

Add a definition for enumeration that will be extended as new plugins will be added (e.g., to add XML serialization):

enumeration SerializerType
  Json,
  Xml
end enumeration

Change ShoppingCart's serialize implementation to one like below (e.g., to add XML serialization):

public function serialize(serializer : SerializerType) : string
  if(serializer == SerializerType.Json)
    return new JsonSerializer().serialize(content.clone())
  else if(serializer == SerializerType.Xml)
    return new XmlSerializer().serialize(content.clone())
  else 
    throw Error("Not implemented error!");
  end if    
end function

Change ShoppingCart's serialize implementation to:

public function serialize(serializer : ISerializer) : string
  return serializer.serialize(content.clone())
end function

Change the ShoppingCart's access modifiers of data members from private to public. Like:

private content : Dictionary<int, string>

to:

public content : Dictionary<int, string>

so that plugins can directly manipulate and save the shopping cart.

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