attendeevaluefactory.java

来自「100多M的J2EE培训内容」· Java 代码 · 共 104 行

package com.borland.training.meetings.sessions;

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

class AttendeeValueFactory {

  private static AttendeeValueFactory instance = null;
  private EJBHomeFactory homeFactory;

  private AttendeeValueFactory() throws NamingException {
    homeFactory = EJBHomeFactory.getInstance();
  }

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

  public AttendeeValue getAttendee(Long id)
    throws FinderException, NamingException {

    Attendee attendee = findAttendee(id);
    return createValue(attendee);
  }

  public Collection getAttendeesByName(String name)
    throws FinderException, NamingException {

    Collection attendees = findAttendeesByName(name);
    return createValues(attendees);
  }

  public Collection getAllAttendees()
    throws FinderException, NamingException {

    Collection attendees = findAllAttendees();
    return createValues(attendees);
  }

  // Helper method used by the factory or a manager
  public Attendee findAttendee(Long id)
    throws FinderException, NamingException {

    AttendeeHome home = (AttendeeHome) homeFactory.lookupByLocalEJBReference("Attendee");
    return home.findByPrimaryKey(id);
  }

  // Helper method used by the factory or a manager
  public Collection findAllAttendees()
    throws FinderException, NamingException {

    AttendeeHome home = (AttendeeHome) homeFactory.lookupByLocalEJBReference("Attendee");
    return home.findAll();
  }

  // Helper method used by the factory or a manager
  public Collection findAttendeesByName(String name)
    throws FinderException, NamingException {

    AttendeeHome home = (AttendeeHome) homeFactory.lookupByLocalEJBReference("Attendee");
    return home.findByName(name);
  }

  // Helper method used by the factory.
  private AttendeeValue createValue(Attendee attendee) {
    return new AttendeeValue(attendee.getId(),
      attendee.getName(),
      attendee.getPosition(),
      attendee.getTitle(),
      attendee.getPhone(),
      attendee.getEmail(),
      getMeetingIds(attendee));
  }

  // Helper method used by the factory.
  private Collection createValues(Collection attendees) {
    Collection attendeeValues = new Vector(attendees.size());
    Iterator iterator = attendees.iterator();
    Attendee attendee = null;
    while(iterator.hasNext()) {
      attendee = (Attendee) iterator.next();
      attendeeValues.add(createValue(attendee));
    }
    return attendeeValues;
  }

  // Helper method used by the factory
  private Collection getMeetingIds(Attendee attendee) {
    Collection meetings = attendee.getMeetings();
    Collection meetingIds = new Vector(meetings.size());
    Iterator iterator = meetings.iterator();
    Meeting meeting = null;
    while(iterator.hasNext()) {
      meeting = (Meeting) iterator.next();
      meetingIds.add(meeting.getId());
    }
    return meetingIds;
  }
}