| // Copyright 2004 The Apache Software Foundation |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package org.apache.tapestry.vlib.pages; |
| |
| import java.rmi.RemoteException; |
| |
| import javax.ejb.FinderException; |
| import javax.ejb.RemoveException; |
| |
| import org.apache.tapestry.ApplicationRuntimeException; |
| import org.apache.tapestry.IRequestCycle; |
| import org.apache.tapestry.html.BasePage; |
| import org.apache.tapestry.vlib.VirtualLibraryEngine; |
| import org.apache.tapestry.vlib.ejb.Book; |
| import org.apache.tapestry.vlib.ejb.IOperations; |
| |
| /** |
| * Presents a confirmation page before deleting a book. If the user |
| * selects "yes", the book is deleted; otherwise the user is returned |
| * to the {@link MyLibrary} page. |
| * |
| * @author Howard Lewis Ship |
| * @version $Id$ |
| * |
| **/ |
| |
| public abstract class ConfirmBookDelete extends BasePage |
| { |
| public abstract void setBookId(Integer bookId); |
| |
| public abstract void setBookTitle(String title); |
| |
| /** |
| * Invoked (by {@link MyLibrary}) to select a book to be |
| * deleted. This method sets the temporary page properties |
| * (bookPrimaryKey and bookTitle) and invoked {@link IRequestCycle#setPage(IPage)}. |
| * |
| **/ |
| |
| public void selectBook(Integer bookId, IRequestCycle cycle) |
| { |
| setBookId(bookId); |
| |
| VirtualLibraryEngine vengine = (VirtualLibraryEngine) getEngine(); |
| |
| int i = 0; |
| while (true) |
| { |
| try |
| { |
| IOperations operations = vengine.getOperations(); |
| Book book = operations.getBook(bookId); |
| |
| setBookTitle(book.getTitle()); |
| |
| break; |
| } |
| catch (FinderException ex) |
| { |
| throw new ApplicationRuntimeException(ex); |
| } |
| catch (RemoteException ex) |
| { |
| vengine.rmiFailure("Remote exception reading read book #" + bookId + ".", ex, i++); |
| } |
| } |
| |
| cycle.activate(this); |
| } |
| |
| /** |
| * Hooked up to the yes component, this actually deletes the book. |
| * |
| **/ |
| |
| public void deleteBook(IRequestCycle cycle) |
| { |
| Object[] parameters = cycle.getServiceParameters(); |
| Integer bookPK = (Integer) parameters[0]; |
| |
| VirtualLibraryEngine vengine = (VirtualLibraryEngine) getEngine(); |
| Book book = null; |
| |
| int i = 0; |
| while (true) |
| { |
| try |
| { |
| IOperations operations = vengine.getOperations(); |
| |
| book = operations.deleteBook(bookPK); |
| |
| break; |
| } |
| catch (RemoveException ex) |
| { |
| throw new ApplicationRuntimeException(ex); |
| } |
| catch (RemoteException ex) |
| { |
| vengine.rmiFailure("Remote exception deleting book #" + bookPK + ".", ex, i++); |
| } |
| } |
| |
| MyLibrary myLibrary = (MyLibrary) cycle.getPage("MyLibrary"); |
| |
| myLibrary.setMessage(format("book-deleted", book.getTitle())); |
| |
| myLibrary.activate(cycle); |
| } |
| } |