Tukukkk

How can I create a constraint with Hibernate? I'm mapping two classes, "Team" and "Match", but I want that a match JUST can happens if the teams are from the same League. The way that I'm doing right now I can create a match with teams from differents leagues (which isn't interesting in this case).
Is there some annotation that "wraps" my teams, home and away, just being from one league? Or I have to do this in my system?

Thanks.

@Table(name = "match")

@Entity

public class Match implements Serializable {



private static final long serialVersionUID = 1L;

@Id

@GeneratedValue(strategy = GenerationType.AUTO)

private Integer id;

@ManyToOne

@JoinColumn(name = "id_league")

private League league;

@ManyToOne

@JoinColumn(name = "id_home", referencedColumnName="id")

private Team home;

@ManyToOne

@JoinColumn(name = "id_away", referencedColumnName="id")

private Team away;

@Column

private Integer goalsHome;

@Column

private Integer goalsAway;

@Temporal(value = TemporalType.DATE)

private Date matchDate;

and

@Table(name="team")

@Entity

public class Team implements Serializable {



private static final long serialVersionUID = 1L;



@Id

@GeneratedValue(strategy = GenerationType.AUTO)

private Integer id;

@Column(length = 55)

private String name;

@ManyToOne

@JoinColumn(name = "id_league")

private League league;

@OneToMany

private List<Match> match;