@Named
@ViewScoped
public class CollectorView implements Serializable {
    
    private Book book;
	
	private List<Book> books;
    
    @PostConstruct
    public void init() {
        book = new Book();
        books = new ArrayList<Book>();
        
    }
	
	public void createNew() {
		if(books.contains(book)) {
			FacesMessage msg = new FacesMessage("Dublicated", "This book has already been added");
			FacesContext.getCurrentInstance().addMessage(null, msg);
		} 
        else {
            books.add(book);
            book = new Book();
        }
	}
	
	public String reinit() {
		book = new Book();
		
		return null;
	}

	public Book getBook() {
		return book;
	}

	public List<Book> getBooks() {
		return books;
	}
}

public class Book implements Serializable {
    
    private String title;
	private String author;
	private String publisher;
	private Integer pages;

	public String getTitle() {
		return title;
	}

	public void setTitle(String title) {
		this.title = title;
	}

	public String getAuthor() {
		return author;
	}

	public void setAuthor(String author) {
		this.author = author;
	}

	public String getPublisher() {
		return publisher;
	}

	public void setPublisher(String publisher) {
		this.publisher = publisher;
	}

	public Integer getPages() {
		return pages;
	}

	public void setPages(Integer pages) {
		this.pages = pages;
	}

	public boolean equals(Object obj) {
		if(!(obj instanceof Book))
			return false;
		
		Book book = (Book) obj;
		
		return (book.getTitle() != null && book.getTitle().equals(title)) && (book.getAuthor() != null && book.getAuthor().equals(author));
	}

	public int hashCode() {
		int hash = 1;
		if(title != null)
			hash = hash * 31 + title.hashCode();
		
		if(author != null)
			hash = hash * 29 + author.hashCode();

		return hash;
	}
}