package my.app.crud.business;

import java.util.List;

import javax.ejb.Stateless;
import javax.ejb.TransactionAttribute;
import javax.ejb.TransactionAttributeType;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;

import my.app.crud.model.Book;

@Stateless
@TransactionAttribute(value = TransactionAttributeType.REQUIRED)
public class BookServiceBean {

	@PersistenceContext
	private EntityManager entityManager;
		
	public Book create() {
		return new Book();
	}
	
	public void delete(Book book) {
		book = entityManager.merge(book);
		entityManager.remove(book);
	}
	
	public Book update(Book book) {
		return entityManager.merge(book);
	}
	
	public Book find(Integer id) {
		return entityManager.find(Book.class, id);
	}
	
	@SuppressWarnings("unchecked")
	public List<Book> getAllBooks() {
		
		Query query = entityManager.createNamedQuery("Book.findAll");
		
		List<Book> result = (List<Book>)query.getResultList();
		
		return result;
	}	
}