rosterbean.java

Sun公司的<J2EE Tutorial>范例代码

            players = playerHome.findByCity(city);
        } catch (Exception ex) {
            throw new EJBException(ex.getMessage());
        }

        return copyPlayersToDetails(players);
    } // getPlayersByCity

    public ArrayList getAllPlayers() {
        Debug.print("RosterBean getAllPlayers");

        Collection players = null;

        try {
            players = playerHome.findAll();
        } catch (Exception ex) {
            throw new EJBException(ex.getMessage());
        }

        return copyPlayersToDetails(players);
    } // getAllPlayers

    public ArrayList getPlayersNotOnTeam() {
        Debug.print("RosterBean getPlayersNotOnTeam");

        Collection players = null;

        try {
            players = playerHome.findNotOnTeam();
        } catch (Exception ex) {
            throw new EJBException(ex.getMessage());
        }

        return copyPlayersToDetails(players);
    } // getPlayersNotOnTeam

    public ArrayList getPlayersByPositionAndName(String position, String name) {
        Debug.print("RosterBean getPlayersByPositionAndName");

        Collection players = null;

        try {
            players = playerHome.findByPositionAndName(position, name);
        } catch (Exception ex) {
            throw new EJBException(ex.getMessage());
        }

        return copyPlayersToDetails(players);
    } // getPlayersByPositionAndName

    public ArrayList getLeaguesOfPlayer(String playerId) {
        Debug.print("RosterBean getLeaguesOfPlayer");

        ArrayList detailsList = new ArrayList();
        Collection leagues = null;

        try {
            LocalPlayer player = playerHome.findByPrimaryKey(playerId);

            leagues = player.getLeagues();
        } catch (Exception ex) {
            throw new EJBException(ex.getMessage());
        }

        Iterator i = leagues.iterator();

        while (i.hasNext()) {
            LocalLeague league = (LocalLeague) i.next();
            LeagueDetails details =
                new LeagueDetails(league.getLeagueId(), league.getName(),
                    league.getSport());

            detailsList.add(details);
        }

        return detailsList;
    } // getLeaguesOfPlayer

    public ArrayList getSportsOfPlayer(String playerId) {
        Debug.print("RosterBean getSportsOfPlayer");

        ArrayList sportsList = new ArrayList();
        Collection sports = null;

        try {
            LocalPlayer player = playerHome.findByPrimaryKey(playerId);

            sports = player.getSports();
        } catch (Exception ex) {
            throw new EJBException(ex.getMessage());
        }

        Iterator i = sports.iterator();

        while (i.hasNext()) {
            String sport = (String) i.next();

            sportsList.add(sport);
        }

        return sportsList;
    } // getSportsOfPlayer

    // Team business methods
    public void createTeamInLeague(TeamDetails details, String leagueId) {
        Debug.print("RosterBean createTeamInLeague");

        try {
            LocalLeague league = leagueHome.findByPrimaryKey(leagueId);
            LocalTeam team =
                teamHome.create(details.getId(), details.getName(),
                    details.getCity());

            league.addTeam(team);
        } catch (Exception ex) {
            throw new EJBException(ex.getMessage());
        }
    }

    public void removeTeam(String teamId) {
        Debug.print("RosterBean removeTeam");

        try {
            LocalTeam team = teamHome.findByPrimaryKey(teamId);

            team.remove();
        } catch (Exception ex) {
            throw new EJBException(ex.getMessage());
        }
    }

    public TeamDetails getTeam(String teamId) {
        Debug.print("RosterBean getTeam");

        TeamDetails teamDetails = null;

        try {
            LocalTeam team = teamHome.findByPrimaryKey(teamId);

            teamDetails = new TeamDetails(teamId, team.getName(), team.getCity());
        } catch (Exception ex) {
            throw new EJBException(ex.getMessage());
        }

        return teamDetails;
    }

    // League business methods
    public void createLeague(LeagueDetails details) {
        Debug.print("RosterBean createLeague");

        try {
            LocalLeague league =
                leagueHome.create(details.getId(), details.getName(),
                    details.getSport());
        } catch (Exception ex) {
            throw new EJBException(ex.getMessage());
        }
    }

    public void removeLeague(String leagueId) {
        Debug.print("RosterBean removeLeague");

        try {
            LocalLeague league = leagueHome.findByPrimaryKey(leagueId);

            league.remove();
        } catch (Exception ex) {
            throw new EJBException(ex.getMessage());
        }
    }

    public LeagueDetails getLeague(String leagueId) {
        Debug.print("RosterBean getLeague");

        LeagueDetails leagueDetails = null;

        try {
            LocalLeague league = leagueHome.findByPrimaryKey(leagueId);

            leagueDetails = new LeagueDetails(leagueId, league.getName(),
                    league.getSport());
        } catch (Exception ex) {
            throw new EJBException(ex.getMessage());
        }

        return leagueDetails;
    }

    // SessionBean methods
    public void ejbCreate() throws CreateException {
        Debug.print("RosterBean ejbCreate");

        try {
            playerHome = lookupPlayer();
            teamHome = lookupTeam();
            leagueHome = lookupLeague();
        } catch (NamingException ex) {
            throw new CreateException(ex.getMessage());
        }
    }

    public void ejbActivate() {
        Debug.print("RosterBean ejbActivate");

        try {
            playerHome = lookupPlayer();
            teamHome = lookupTeam();
            leagueHome = lookupLeague();
        } catch (NamingException ex) {
            throw new EJBException(ex.getMessage());
        }
    }

    public void ejbPassivate() {
        playerHome = null;
        teamHome = null;
        leagueHome = null;
    }

    public void ejbRemove() {
    }

    public void setSessionContext(SessionContext sc) {
    }

    // Private methods
    private LocalPlayerHome lookupPlayer() throws NamingException {
        Context initial = new InitialContext();
        Object objref = initial.lookup("java:comp/env/ejb/SimplePlayer");

        return (LocalPlayerHome) objref;
    }

    private LocalTeamHome lookupTeam() throws NamingException {
        Context initial = new InitialContext();
        Object objref = initial.lookup("java:comp/env/ejb/SimpleTeam");

        return (LocalTeamHome) objref;
    }

    private LocalLeagueHome lookupLeague() throws NamingException {
        Context initial = new InitialContext();
        Object objref = initial.lookup("java:comp/env/ejb/SimpleLeague");

        return (LocalLeagueHome) objref;
    }

    private ArrayList copyPlayersToDetails(Collection players) {
        ArrayList detailsList = new ArrayList();
        Iterator i = players.iterator();

        while (i.hasNext()) {
            LocalPlayer player = (LocalPlayer) i.next();
            PlayerDetails details =
                new PlayerDetails(player.getPlayerId(), player.getName(),
                    player.getPosition(), player.getSalary());

            detailsList.add(details);
        }

        return detailsList;
    } // copyPlayersToDetails
} // RosterBean