Adapter Design Pattern Archives

Introduction:
Sometimes you have set of classes with different interfaces and you want to call logic on those classes in a consistent way. Adapter design pattern solve this issue, by providing a technique (best practice) to wrap those classes somehow to make it easy to deal with this set of classes. Also Adapter is responsible of data transformation between heterogeneous interfaces .
The main benefits from Adapter Design pattern is letting classes work together that could not otherwise because of incompatible interfaces.

Example:

class Program
{
static void Main(string[] args)
{
PersonBase p1 = new GoodPerson(“111111”);
PersonBase p2 = new GoodPerson(“222222”);
PersonBase p3 = new GoodPerson(“333333”);
p1.Display();
p2.Display();
p3.Display();
Console.ReadKey();
}
}
class PersonDataBank
{
//Lagecy APIs
public float GetTall(string uniqueId)
{
switch (uniqueId)
{
case “111111”:
return 100f;
case “222222”:
return 102f;
case “333333”:
return 103f;
default:
return 150f;
}
}
public DateTime GetDateOfBith(string uniqueId)
{
switch (uniqueId)
{
case “111111”:
return DateTime.Parse(“1/1/2000”); ;
case “222222”:
return DateTime.Parse(“1/1/2001”); ;
case “333333”:
return DateTime.Parse(“1/1/2002”); ;
default:
return DateTime.Parse(“1/1/2003”); ;
}
}
public string GetBirthPlace(string uniqueId)
{
switch (uniqueId)
{
case “111111”:
return “USA,Los Angeles”;
case “222222”:
return “USA,SD”;
case “333333”:
return “USA,LV”;
default:
return “USA,WA”;
}
}
}
class PersonBase
{
public float Tall {get;set;}
public DateTime DateOfBirth {get;set;}
public string BithPlace {get;set;}
protected string uniqueId { get; set; }
public PersonBase(string uniqueId)
{
this.uniqueId = uniqueId;
}
public virtual void Display()
{
Console.WriteLine(“\nPerson: {0} “, this.uniqueId);
}
}
class GoodPerson: PersonBase
{
public GoodPerson(string uniqueId) :base(uniqueId)
{
}
public override void Display()
{
PersonDataBank bank = new PersonDataBank();
base.DateOfBirth = bank.GetDateOfBith(base.uniqueId);
base.BithPlace = bank.GetBirthPlace(base.uniqueId);
base.Tall = bank.GetTall(base.uniqueId);
base.Display();
Console.WriteLine(” DOB: {0}”, DateOfBirth);
Console.WriteLine(” Birth Place : {0}”, BithPlace);
Console.WriteLine(” Tall: {0}”, Tall);
Console.WriteLine(“=====================”);
}
}

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