attendeemanager.java

来自「100多M的J2EE培训内容」· Java 代码 · 共 94 行

package com.borland.training.meetings.sessions;

import java.util.*;
import javax.ejb.*;
import javax.naming.*;
import com.borland.training.meetings.entities.*;
import com.borland.training.meetings.sessions.*;

class AttendeeManager {

  private static AttendeeManager instance = null;
  private AttendeeValueFactory attendeeValueFactory;
  private MeetingValueFactory meetingValueFactory;
  private EJBHomeFactory homeFactory;

  private AttendeeManager() throws NamingException {
    homeFactory = EJBHomeFactory.getInstance();
    attendeeValueFactory = AttendeeValueFactory.getInstance();
    meetingValueFactory = MeetingValueFactory.getInstance();
  }

  public static AttendeeManager getInstance() throws NamingException {
    if(instance == null) {
      instance = new AttendeeManager();
    }
    return instance;
  }

  public Long createAttendee(AttendeeValue attendeeValue)
    throws FinderException, NamingException {

    try {
      AttendeeHome attendeeHome =
        (AttendeeHome) homeFactory.lookupByLocalEJBReference("Attendee");
      Attendee attendee = attendeeHome.create(attendeeValue.getName(),
        attendeeValue.getPosition(),
        attendeeValue.getTitle(),
        attendeeValue.getPhone(),
        attendeeValue.getEmail());
      return attendee.getId();
    }
    catch(Exception e) {
      throw new EJBException(e);
    }
  }

  // Updating the attendee's meeting list is not supported here.
  // This functionality is provided by the Meeting bean.

  public void updateAttendee(AttendeeValue attendeeValue)
    throws FinderException, NamingException {

    try {
      Attendee attendee = attendeeValueFactory.findAttendee(attendeeValue.getId());
      attendee.setName(attendeeValue.getName());
      attendee.setPosition(attendeeValue.getPosition());
      attendee.setTitle(attendeeValue.getTitle());
      attendee.setPhone(attendeeValue.getPhone());
      attendee.setEmail(attendeeValue.getEmail());
    }
    catch(Exception e) {
      throw new EJBException(e);
    }
  }

  public void removeAttendee(Long id)
    throws FinderException, NamingException {

    try {
      Attendee attendee = attendeeValueFactory.findAttendee(id);
      attendee.remove();
    }
    catch(Exception e) {
      throw new EJBException(e);
    }
  }

  public void removeAllAttendees()
    throws FinderException, NamingException {

    try {
      Collection attendees = attendeeValueFactory.findAllAttendees();
      Iterator iterator = attendees.iterator();
      Attendee attendee = null;
      while(iterator.hasNext()) {
        attendee = (Attendee) iterator.next();
        attendee.remove();
      }
    }
    catch(Exception e) {
      throw new EJBException(e);
    }
  }
}