/* Notes:
* Adapters are often used when client code is written to expect classes
* from one framework, and it meant to work with classes from a totally
* different framework. Assume you cannot change the code of either framework.
* the solution is for you to write an adapter, which appears like a
* native class to each framework.
*
* There are two different types of adapters - class adapter and object
* adapter. Class adapters are based on multiple inheritance - specifically
* the interface of the target class and the implementation of the adaptee.
* Unfortunately C# supports multiple inheritance for interfaces but not
* for classes. Object adapters derive from the target (single inheritance)
* and maintain a private instance of the adoptee.
*
* The sample code here shows an object adapter. We have a class called
* FrameworkYAdaptee which we wish to use, yet the (bulk of) the client code
* (in GenericClientCode) is written to expect a class called FrameworkXTarget.
* To solve the probelm we create an Adapter class, which it a FrameworkXTarget
* to the client, and calls FrameworkYAdaptee.
*
*/
namespace Adapter_DesignPattern
{
using System;
class FrameworkXTarget
{
virtual public void SomeRequest(int x)
{
// normal implementation of SomeRequest goes here
}
}
class FrameworkYAdaptee
{
public void QuiteADifferentRequest(string str)
{
Console.WriteLine("QuiteADifferentRequest = {0}", str);
}
}
class OurAdapter : FrameworkXTarget
{
private FrameworkYAdaptee adaptee = new FrameworkYAdaptee();
override public void SomeRequest(int a)
{
string b;
b = a.ToString();
adaptee.QuiteADifferentRequest(b);
}
}
/// <summary>
/// Summary description for Client.
/// </summary>
public class Client
{
void GenericClientCode(FrameworkXTarget x)
{
// We assume this function contains client-side code that only
// knows about FrameworkXTarget.
x.SomeRequest(4);
// other calls to FrameworkX go here
// ...
}
public static int Main(string[] args)
{
Client c = new Client();
FrameworkXTarget x = new OurAdapter();
c.GenericClientCode(x);
return 0;
}
}
}
