Iteratorパターン練習

using UnityEngine;
using System;

public class TestScript : MonoBehaviour
{
	void Start ()
	{
		var bookShelf = new Iterator1.BookShelf ();
		bookShelf.Add (new Book ("111"));
		bookShelf.Add (new Book ("222"));
		bookShelf.Add (new Book ("333"));

		var iterator = bookShelf.Iterator ();
		while (iterator.HasNext ()) {
			var book = iterator.Next ();
			Debug.Log (book.GetName ());
		}
	}
}

インターフェース

public interface Aggeregate<T>
{
	Iterator<T> Iterator ();
}

public interface Iterator<T>
{
	bool HasNext ();

	T Next ();
}

実装

using System.Collections.Generic;

namespace Iterator1
{
	public class BookShelf : Aggeregate<Book>
	{
		List<Book> books = new List<Book> ();

		public Book GetAt (int index)
		{
			return books [index];
		}

		public void Add (Book data)
		{
			books.Add (data);
		}

		public void RemoveAt (int index)
		{
			books.RemoveAt (index);
		}

		public int GetCount ()
		{
			return books.Count;
		}

		public Iterator<Book> Iterator ()
		{
			return new BookIterator (this);
		}

	}

	public class BookIterator : Iterator<Book>
	{
		private BookShelf bookShelf;
		private int index;

		public BookIterator (BookShelf bookShelf)
		{
			this.bookShelf = bookShelf;
		}

		public bool HasNext ()
		{
			return index < bookShelf.GetCount ();
		}

		public Book Next ()
		{
			var item = bookShelf.GetAt (index);
			index++;
			return item;
		}

	}

}