//-------------
// Identifiable
//-------------
public class Identifiable {

	public static final int INVALID_ID = -1;
	
	private int _id;

	protected Identifiable() {
		setID(INVALID_ID);
	}
	
	protected Identifiable(int id) {
		setID(id);
	}
	
	public int getID() {
		return _id;
	}
	
	public void setID(int id) {
		_id = id;
	}
	
	public boolean hasID() {
		return (_id != INVALID_ID);
	}	
}


//--------
// BookDTO
//--------
public class BookDTO extends Identifiable {

	private String _title;
	private String _author;
	private Genre _genre;
	
	public BookDTO() {
		return;
	}
	
	public BookDTO(int id, String title, String author, Genre genre) {
		super(id);
		setTitle(title);
		setAuthor(author);
		setGenre(genre);
	}
	
	public String getTitle() {
		return _title;
	}
	
	public void setTitle(String title) {
		_title = title;
	}
	
	public String getAuthor() {
		return _author;
	}
	
	public void setAuthor(String author) {
		_author = author;
	}
	
	public Genre getGenre() {
		return _genre;
	}
	
	public void setGenre(Genre genre) {
		_genre = genre;
	}
}


//----------
// MemberDTO
//----------
public class MemberDTO extends Identifiable {

	private String _name;
	private EmailAddress _emailAddress;
	
	public MemberDTO() {
		return;
	}
	
	public MemberDTO(int id, String name, EmailAddress emailAddress) {
		super(id);
		setName(name);
		setEmailAddress(emailAddress);
	}

	public String getName() {
		return _name;
	}

	public void setName(String name) {
		_name = name;
	}

	public EmailAddress getEmailAddress() {
		return _emailAddress;
	}

	public void setEmailAddress(EmailAddress emailAddress) {
		_emailAddress = emailAddress;
	}	
}


//-----------
// ReadingDTO
//-----------
public class ReadingDTO {

	private int _member;
	private int _book;
	
	public ReadingDTO() {
		return;
	}
	
	public ReadingDTO(int member, int book) {
		setMember(member);
		setBook(book);
	}
	
	public int getMember() {
		return _member;
	}
	
	public void setMember(int member) {
		_member = member;
	}
	
	public int getBook() {
		return _book;
	}
	
	public void setBook(int book) {
		_book = book;
	}	
}