/// <summary>
/// Finds the book by tag.
/// </summary>
/// <param name="tagPredicate">The tag predicate.</param>
/// <returns></returns>
/// <exception cref="System.ArgumentNullException">tagPredicate</exception>
/// <exception cref="System.ArgumentException">
/// books count is 0
/// or
/// tagPredicate can't find such book.
/// </exception>
public Book FindBookByTag(IPredicate <Book> tagPredicate)
{
if (tagPredicate == null)
{
throw new ArgumentNullException($"{nameof(tagPredicate)} is null");
}
if (this.books.Count == 0)
{
throw new ArgumentException($"{nameof(books)} has 0 elements");
}
foreach (Book book in books)
{
if (tagPredicate.Find(book))
{
return(book);
}
}
throw new ArgumentException($"{nameof(tagPredicate)} can't find such book");
}