Adaptation

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The adapter pattern is used to 'adapt' an interface provided by a class to one that a consuming pattern can use.

This software implements a registry where adapters can be registered to provide an interface given one or more context objects.

This allows smaller, simpler components.

Typical usage might be as follows:

// Register our adapters
registry.Register(typeof(IEvent), typeof(IHTMLDisplay), typeof(EventHtmlAdapter));
registry.Register(typeof(IImage), typeof(IHTMLDisplay), typeof(ImageHtmlAdapter));
registry.Register(typeof(INewsItem), typeof(IHTMLDisplay), typeof(NewsHtmlAdapter));

// Create our basic objects 

// implements IEvent
Event ev = new Event(); 

// implements INewsItem
NewsItem news = new NewsItem();

// Implements IImage
Image im = new Image();

// Use a SimpleLookup for basic lookup policies
SimpleLookup lookup = new SimpleLookup(registry);
IHTMLDisplay adapter;
foreach(object ob in new object[] { ev, news, im })
{
    adapter = lookup.AdaptTo<IHTMLDisplay>(ob);
    System.Console.WriteLine(adapter.HTML);
}

// Actually, you can register and lookup by class too,
// not just interface
registry = new Registry();
registry.Register(typeof(Event), typeof(IHTMLDisplay), typeof(EventHtmlAdapter));
registry.Register(typeof(Image), typeof(IHTMLDisplay), typeof(ImageHtmlAdapter));
registry.Register(typeof(NewsItem), typeof(IHTMLDisplay), typeof(NewsHtmlAdapter));
lookup = new SimpleLookup(registry);

// This prints the same output as last time
foreach(object ob in new object[] { ev, news, im })
{
    adapter = lookup.AdaptTo<IHTMLDisplay>(ob);
    System.Console.WriteLine(adapter.HTML);
}

Self-Certification

[ ] Internationalized

[X] Unit tests

[ ] End-user documentation

[ ] Internal documentation (documentation, interfaces, etc.)

[ ] Existed and maintained for at least 6 months

[ ] Installs and uninstalls cleanly

[ ] Code structure follows best practice

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