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 | package test;
 
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.Random;
 
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
 
 
@Stateless
public class BookManager implements BookManager_Interface {
	private Collection books;
	@PersistenceContext
	EntityManager em;
	public void deleteBookById(long id) {
		em.remove(em.find(Book2.class, id));
	}
 
	public Collection getAllBooks() {
		// TODO Auto-generated method stub
		loadData();
		return books;
	}
 
	public void init() {
		// TODO Auto-generated method stub
		// TODO Auto-generated method stub
		Random random = new Random();
		em.persist(new Book2(random.nextLong(), "David Roos", "Struts book", true));
	    em.persist(new Book2(random.nextLong(), "Micheal Jackson", "Java book", true));
	    em.persist(new Book2(random.nextLong(), "Bruce Lee", "Java2 book", false));
	    em.persist(new Book2(random.nextLong(), "Tom Jones" ,"EJB book", true));
	    em.persist(new Book2(random.nextLong(), "Mc Donald", "Jboss for beginners", false));
        em.persist(new Book2(random.nextLong(), "Lars Mars", "Using Myeclipse for cooking", true));
        em.persist(new Book2(random.nextLong(), "Mary Jane", "EJB or spending your weekends", true));
 
	}
 
	public Book2 loadBookById(long id) {
		// TODO Auto-generated method stub
 
		return (Book2)em.find(Book2.class, id);
	}
 
	public void loadData() {
		// TODO Auto-generated method stub
        books = (Collection)em.createQuery("from Book2");
        if (books == null)
            init();
	}
 
 
 
 
	public long saveToDB(Book2 book) {
		 loadData();
 
	        // laliluna 04.10.2004 loop over collection and trying to find the book
	        boolean bookExist = false;
	        ArrayList booksNew = (ArrayList) books;
	        int index = 0;
	        for (Iterator iter = books.iterator(); iter.hasNext();) {
	            Book2 element = (Book2) iter.next();
	            // laliluna 04.10.2004 if book is found do an update
	            if (element.getId() == book.getId()) {
	            	booksNew.set(index, book);
	                bookExist = true;
	                break;
	            }
	            index++;
	        }
 
	        books = booksNew;
 
	        // laliluna 04.10.2004 if book is not found, create a new book
	        if (bookExist == false) {
	            Random random = new Random();
	            book.setId(random.nextLong());
em.persist(book);	       
}
 
	        // laliluna 04.10.2004 save to DB ;-)
 
	        return book.getId();
	}
 
 
 
 
 
} | 
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