/*
* The Iterator Pattern
*
* Provides a way to access the elements of an aggregate object
* sequentially without exposing its underlying representation.
*
* Example:
* Print out menu of the cafe and print out the categories of the meal.
*
* 1. Ask the object for its iterator.
* 2. Use iterator to iterate through the items in the aggregate.
* 3. Iteration code works with any kind of agregate objects.
*
* A class should have only one reason to change. (Design Principle #6)
*
*
*/
static void Main(string[] args)
{
var pancakeHouseMenue = new PancakeHouseMenu();
var dinerMenu = new DinerMenu();
IEnumerable vegMenu = new VegeterianMenu();
IIterator pancakeHouseIter = pancakeHouseMenue.CreateIterator();
IIterator dinerMenuIter = dinerMenu.CreateIterator();
//IEnumerator vegMenuEnu = vegMenu.GetEnumerator();
Console.WriteLine("MENU (with iterators)\n----\nBREAKFAST");
PrintMenu(pancakeHouseIter);
Console.WriteLine("LUNCH");
PrintMenu(dinerMenuIter);
Console.WriteLine("VEGETERIAN");
foreach (var i in vegMenu)
{
Console.WriteLine(i as string);
}
}
public VegeterianMenuEnumerator(VegeterianMenu vegeterianMenu)
{
this.vegeterianMenu = vegeterianMenu;
}