Two-Way Adapter Pattern
Description:
Adapter Pattern:» The Adapter pattern joins together types that were not designed to work with each other;
» The Adapter pattern enables a system to use classes whose interfaces don't quite match its requirements.
Two-Way Adapter Pattern:
» Enables different clients to view an object differently;
» The Two-way adapter addresses the problem where the characteristics of one system have to be used in the other, and vice versa. An Adapter class is set up to absorb the important common methods of both and to provide adaptations to both.
Use When:
» Create a reusable class to cooperate with yet-to-be-built classes.;» Change the names of methods as called and as implemented;
» Support different sets of methods for different purposes.
//Define the Seabird Two-Way Adapter Object.
//The SeabirdAdapter class (object) represents the two-way adapter class, and is the common interface between the two adapted classes (objects).
public class SeabirdAdapter : Seacraft, IAircraft
{
public int Height { get; private set; }
public void TakeOff()
{
while (!Airborne)
{
IncreaseRevs();
}
}
public bool Airborne
{
get
{
return (Height > 50);
}
}
public override void IncreaseRevs()
{
base.IncreaseRevs();
if (Speed > 40)
{
Height += 100;
}
}
}
//The SeabirdAdapter class (object) represents the two-way adapter class, and is the common interface between the two adapted classes (objects).
public class SeabirdAdapter : Seacraft, IAircraft
{
public int Height { get; private set; }
public void TakeOff()
{
while (!Airborne)
{
IncreaseRevs();
}
}
public bool Airborne
{
get
{
return (Height > 50);
}
}
public override void IncreaseRevs()
{
base.IncreaseRevs();
if (Speed > 40)
{
Height += 100;
}
}
}
//Define the AirCraft Interface and Handler Object.
//Define the IAircraft interface to be used as the target interface, which represents the first adapter.
public interface IAircraft
{
bool Airborne { get; }
void TakeOff();
int Height { get; }
}
//The Aircraft class (object) represents a class to be adapted.
sealed class Aircraft : IAircraft
{
public Aircraft()
{
Height = 0;
Airborne = false;
}
public bool Airborne { get; private set; }
public int Height { get; private set; }
public void TakeOff()
{
Console.WriteLine("Aircraft engine takeoff!");
Airborne = true;
Height = 200;
}
}
//Define the IAircraft interface to be used as the target interface, which represents the first adapter.
public interface IAircraft
{
bool Airborne { get; }
void TakeOff();
int Height { get; }
}
//The Aircraft class (object) represents a class to be adapted.
sealed class Aircraft : IAircraft
{
public Aircraft()
{
Height = 0;
Airborne = false;
}
public bool Airborne { get; private set; }
public int Height { get; private set; }
public void TakeOff()
{
Console.WriteLine("Aircraft engine takeoff!");
Airborne = true;
Height = 200;
}
}