using System;
using System.Collections;

namespace jive
{
  public static class ConversionExtensions
  {
    public static T downcast_to<T>(this object object_to_cast)
    {
      return (T) object_to_cast;
    }

    public static T converted_to<T>(this object item_to_convert)
    {
      if (item_to_convert.is_an_implementation_of<IConvertible>())
        return (T) Convert.ChangeType(item_to_convert, typeof (T));
      return item_to_convert.downcast_to<T>();
    }

    public static bool is_an_implementation_of<T>(this object item)
    {
      return item is T;
    }

    public static void call_on<T>(this object target, Action<T> action) where T : class
    {
      if (target as T != null) action(target as T);
    }

    public static void call_on_each<T>(this IEnumerable items, Action<T> action) where T : class
    {
      foreach (var item in items) item.call_on(action);
    }
  }
}