/// <summary>
/// Finds books according to tag
/// </summary>
/// <param name="tag">Object that contains a rule of searching</param>
/// <returns>New <see cref="BookListService"/> object with specified books</returns>
public BookListService FindBookByTag(ITagContainer tag)
{
if (ReferenceEquals(tag, null))
{
throw new ArgumentNullException();
}
BookListService temp = new BookListService(this.logger);
foreach (var t in bookList)
{
if (tag.Contain(t))
{
temp.AddBook(t);
}
}
return(temp);
}
/// <summary>
/// Finds a book by a given criterion
/// </summary>
/// <param name="tag">search criteria</param>
/// <returns>list of matching books</returns>
public List <Book> FindBookByTag(ITagContainer tag)
{
if (tag == null)
{
throw new ArgumentNullException("Tag must be not null");
}
List <Book> temp = new List <Book>();
List <Book> books = GetAllBooks();
foreach (var book in books)
{
if (tag.Contain(book))
{
temp.Add(book);
}
}
logger.Debug("Book was found");
return(temp);
}