strategy_pattern.cs

//do this once and cache it
var ruleEngineTypes = new Dictionary<LanguageTypes, Type>();
ruleEngineTypes.Add(LanguageTypes.CSharp, typeof(CSharpRuleEngine));
ruleEngineTypes.Add(LanguageTypes.Python, typeof(PythonRuleEngine));
ruleEngineTypes.Add(LanguageTypes.JavaScript, typeof(JavaScriptRuleEngine));

//switch turns into this...
var ruleEngineType = ruleEngineTypes[policy.LanguageType];
var engine = (IRuleEngine)Activator.CreateInstance(ruleEngineType);
engine.Execute(plan);