1.7.2. ネストされた対話の理解

@Stateful
@Name("roomPreference")
@Restrict("#{identity.loggedIn}")
public class RoomPreferenceAction implements RoomPreference 
{

    @Logger 
        private Log log;

    @In private Hotel hotel;                                                                  
   
    @In private Booking booking;

    @DataModel(value="availableRooms")
    private List<Room> availableRooms;

    @DataModelSelection(value="availableRooms")
    private Room roomSelection;
    
    @In(required=false, value="roomSelection")
    @Out(required=false, value="roomSelection")
    private Room room;

    @Factory("availableRooms")
    public void loadAvailableRooms()
    {
        availableRooms = hotel.getAvailableRooms(booking.getCheckinDate(), 
                                                 booking.getCheckoutDate());
        log.info("Retrieved #0 available rooms", availableRooms.size());
    }

    public BigDecimal getExpectedPrice()
    {
        log.info("Retrieving price for room #0", roomSelection.getName());
      
        return booking.getTotal(roomSelection);
    }

    @Begin(nested=true)                                                                       
    public String selectPreference()
    {
        log.info("Room selected");
      
        this.room = this.roomSelection;                                                       
      
        return "payment";
    }

    public String requestConfirmation()
    {
        // all validations are performed through the s:validateAll, so checks are
        // already performed
        log.info("Request confirmation from user");
      
        return "confirm";
    }

    @End(beforeRedirect=true)                                                                 
    public String cancel()
    {
        log.info("ending conversation");

        return "cancel";
    }

    @Destroy @Remove                                                                      
        public void destroy() {}    
}

<div class="section">
  <h1>Room Preference</h1>
</div>

<div class="section">
  <h:form id="room_selections_form">
    <div class="section">
      <h:outputText styleClass="output" 
         value="No rooms available for the dates selected: " 
         rendered="#{availableRooms != null and availableRooms.rowCount == 0}"/>
      <h:outputText styleClass="output" 
         value="Rooms available for the dates selected: " 
         rendered="#{availableRooms != null and availableRooms.rowCount > 0}"/>
      
      <h:outputText styleClass="output" value="#{booking.checkinDate}"/>
      <h:outputText styleClass="output" value="#{booking.checkoutDate}"/>
      
      <br/><br/>
      
      <h:dataTable value="#{availableRooms}" var="room"                             
         rendered="#{availableRooms.rowCount > 0}">
        <h:column>
          <f:facet name="header">Name</f:facet>
          #{room.name}
        </h:column>
        <h:column>
          <f:facet name="header">Description</f:facet>
          #{room.description}
        </h:column>
        <h:column>
          <f:facet name="header">Per Night</f:facet>
          <h:outputText value="#{room.price}">
            <f:convertNumber type="currency" currencySymbol="$"/>
          </h:outputText>
        </h:column>
        <h:column>
          <f:facet name="header">Action</f:facet>
          <h:commandLink id="selectRoomPreference" 
            action="#{roomPreference.selectPreference}">Select</h:commandLink>      
        </h:column>
      </h:dataTable>   
    </div>
    <div class="entry">
      <div class="label">&#160;</div>
      <div class="input">
        <s:button id="cancel" value="Revise Dates" view="/book.xhtml"/>             
      </div>
    </div>    
  </h:form>
</div>

@Stateful
@Name("hotelBooking")
@Restrict("#{identity.loggedIn}")
public class HotelBookingAction implements HotelBooking
{
   
   @PersistenceContext(type=EXTENDED)
   private EntityManager em;
   
   @In 
   private User user;
   
   @In(required=false) @Out
   private Hotel hotel;
   
   @In(required=false) 
   @Out(required=false)
   private Booking booking;
   
   @In(required=false)
   private Room roomSelection;
   
   @In
   private FacesMessages facesMessages;
      
   @In
   private Events events;
   
   @Logger 
   private Log log;
   
   @Begin
   public void selectHotel(Hotel selectedHotel)
   {
      log.info("Selected hotel #0", selectedHotel.getName());
      hotel = em.merge(selectedHotel);
   }
   
   public String setBookingDates()
   {
      // the result will indicate whether or not to begin the nested conversation
      // as well as the navigation.  if a null result is returned, the nested
      // conversation will not begin, and the user will be returned to the current
      // page to fix validation issues
      String result = null;

      Calendar calendar = Calendar.getInstance();
      calendar.add(Calendar.DAY_OF_MONTH, -1);

      // validate what we have received from the user so far
      if ( booking.getCheckinDate().before( calendar.getTime() ) )
      {
         facesMessages.addToControl("checkinDate", 
                                    "Check in date must be a future date");
      }
      else if ( !booking.getCheckinDate().before( booking.getCheckoutDate() ) )
      {
         facesMessages.addToControl("checkoutDate", 
                                    "Check out date must be later than check in date");
      }
      else
      {
         result = "rooms";
      }

      return result;
   }
   
   public void bookHotel()
   {      
      booking = new Booking(hotel, user);
      Calendar calendar = Calendar.getInstance();
      booking.setCheckinDate( calendar.getTime() );
      calendar.add(Calendar.DAY_OF_MONTH, 1);
      booking.setCheckoutDate( calendar.getTime() );
   }
   
   @End(root=true)                                                                          
   public void confirm()
   {
      // on confirmation we set the room preference in the booking.  the room preference
      // will be injected based on the nested conversation we are in.
      booking.setRoomPreference(roomSelection);                                             

      em.persist(booking);
      facesMessages.add("Thank you, #{user.name}, your confimation number" +
                        " for #{hotel.name} is #{booking.id}");
      log.info("New booking: #{booking.id} for #{user.username}");
      events.raiseTransactionSuccessEvent("bookingConfirmed");
   }
   
   @End(root=true, beforeRedirect=true)                                                     
   public void cancel() {}
   
   @Destroy @Remove
   public void destroy() {}
}