[JS] Wzorzec Posrednik

function AutoCoder(){
	this.getMaxSpeed = function(carName) {
		switch(carName) {
			case "bmw": return 320; break;
			case "mercedes": return 340; break;
			default : 0; break;
		}
	}
}

var diary = (function(){
	var diary = '';
	return{
		add: function(msg){ diary += msg + "\n"; },
		show: function(){
			cl(diary);
			diary = "";
		}
	}
})();

function AutoProxy(){
	var autoCode = new AutoCoder();
	var autoCache = {};

	return {
		getmaxSpeed: function(carName) {
			if(!autoCache[carName]) {
				autoCache[carName] = autoCoder.getMaxSpeed(carName);
			}

			diary.add(carName +": " + autoCache[carName]);
			return autoCache[carName];
		},

		getCount: function(){
			var count = 0,
			    code;
			for (code in autoCache) {
				++count;
			}
			return count;
		}
	}

}

//var autoCoder = new AutoCoder();
//autoCoder.getMaxSpeed("bmw");

//cl(carCalc.getMaxSpeed("mercedes"));

/*
var autoProxy = new AutoProxy();
autoProxy.getmaxSpeed('bmw');
autoProxy.getmaxSpeed('mercedes');

diary.add("cache size: " + autoProxy.getCount());
diary.show();
*/