// 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.hivemind.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: ConfirmBookDelete.java,v 1.11 2004/04/30 15:17:21 hlship Exp $
*
**/
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);
}
}