API adapter prototype

app.js

/**
 * Base API that all adapters will wrap
 */
var BaseApi = (function ($){
	// Force strict
	"use strict";

	/**
	 * Updates the output div
	 * @param  {string} funcName Name of the function being called
	 * @return {void}
	 */
	var updateOutput = function (funcName, version) {
		$('#output').html('Just fired `'+funcName+'()` from version '+version);
	};

	return {
		updateOutput: updateOutput
	};

})(jQuery);

var Adapter = (function (BaseApi) {
	// Force strict
	"use strict";

	var adapters = {},
		baseApi = BaseApi,

		adapterFactoryException = function (message) {
			return {
				name: 'AdapterFactoryException',
				message: message
			};
		},

		factory = function (version) {
			if (typeof adapters[version] === 'undefined')
				throw adapterFactoryException('Adapter version `'+version+'` does not exist!');

			if (typeof adapters[version].publicInterface === 'undefined')
				throw adapterFactoryException('Adapter must have a publicInterface!');

			return adapters[version].publicInterface;
		},

		register = function (adapter) {
			if (typeof adapter.version === 'undefined')
				throw adapterFactoryException('Adapter must have a version!');

			if (typeof adapters[adapter.version] !== 'undefined')
				throw adapterFactoryException('An adapter of with this version is already registered!');

			adapters[adapter.version] = adapter;
		},

		extend = function (version, adapter) {
			if (typeof adapters[version] === 'undefined')
				throw adapterFactoryException('Adapter version `'+version+'` does not exist!');

			return $.extend(true, {}, adapters[version], adapter);
		};

	return {
		factory: factory,
		register: register,
		extend: extend
	};
})(BaseApi);


(function (Adapter, api) {
	// Force strict
	"use strict";

	var version = '0.1',
		adapter = {
			version: version,
			publicInterface: {
				foo: function () {
					api.updateOutput('foo', version);
				}
			}
		};

	Adapter.register(adapter);
})(Adapter, BaseApi);

(function (Adapter, api) {
	// Force strict
	"use strict";

	var version = '0.2',
		adapter = Adapter.extend('0.1', {
			version: version,
			publicInterface: {
				bar: function () {
					api.updateOutput('bar', version);
				}
			}
		});

	Adapter.register(adapter);
})(Adapter, BaseApi);


(function (Adapter, api) {
	// Force strict
	"use strict";

	var version = '0.3',
		adapter = Adapter.extend('0.2', {
			version: version,
			publicInterface: {
				baz: function () {
					api.updateOutput('baz', version);
				},
				foo: function () {
					api.updateOutput('foo', version);
				}
			}
		});

	Adapter.register(adapter);
})(Adapter, BaseApi);