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Adapter Pattern

Adapter Pattern 


Gamma Categorization: Structural Design Pattern
Summary: Convert the interface of a class into another interface clients expect. Adapter lets classes work together that couldn't otherwise because of incompatible interfaces.

Sample Code

Problem: We want to be able to operate an API that will take photos with both Canon or Nikon APIs.

Code

public class CanonAPI
{
    public void TakePhoto() => System.Console.WriteLine("Taking a photo via Canon API.");
}

public class NikonAPI
{
    public void PhotoShoot() => System.Console.WriteLine("Taking a photo via Nikon API.");
}

public interface ICameraAPIAdapter
{
    void Shoot();
}

public class CanonAdapter : ICameraAPIAdapter
{
    public CanonAPI CanonAPI { get; set;}

    public CanonAdapter(CanonAPI canonAPI)
        {
        this.CanonAPI = canonAPI;
    }

    public void Shoot()
    {
        this.CanonAPI.TakePhoto();
    }
}

public class NikonAdapter : ICameraAPIAdapter
{
    public NikonAPI NikonAPI { get; set;}

    public NikonAdapter(NikonAPI nikonAPI)
        {
        this.NikonAPI = nikonAPI;
    }

    public void Shoot()
    {
        this.NikonAPI.PhotoShoot();
    }
}

Usage

ICameraAPIAdapter adapter = new CanonAdapter(new CanonAPI());
adapter.Shoot(); 

Output

Taking a photo via Canon API.

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