// 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 java.text.DateFormat;
import javax.ejb.FinderException;
import org.apache.tapestry.IExternalPage;
import org.apache.tapestry.IRequestCycle;
import org.apache.tapestry.event.PageEvent;
import org.apache.tapestry.event.PageRenderListener;
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;
/**
* Shows the details of a book, and allows the user to borrow it.
*
* @author Howard Lewis Ship
* @version $Id: ViewBook.java,v 1.7 2004/02/19 17:37:48 hlship Exp $
*
**/
public abstract class ViewBook extends BasePage implements IExternalPage, PageRenderListener
{
private DateFormat _dateFormat;
public abstract Integer getBookId();
public abstract void setBookId(Integer bookId);
public abstract Book getBook();
public abstract void setBook(Book value);
public void activateExternalPage(Object[] parameters, IRequestCycle cycle)
{
Integer bookId = (Integer) parameters[0];
setBookId(bookId);
}
private void readBook()
{
VirtualLibraryEngine vengine = (VirtualLibraryEngine) getEngine();
Integer bookId = getBookId();
int i = 0;
while (true)
{
IOperations bean = vengine.getOperations();
try
{
setBook(bean.getBook(bookId));
return;
}
catch (FinderException ex)
{
vengine.presentError("Book not found in database.", getRequestCycle());
return;
}
catch (RemoteException ex)
{
vengine.rmiFailure(
"Remote exception obtaining information for book #" + bookId + ".",
ex,
i++);
}
}
}
public DateFormat getDateFormat()
{
if (_dateFormat == null)
_dateFormat =
DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.SHORT, getLocale());
return _dateFormat;
}
public void pageBeginRender(PageEvent event)
{
if (getBook() == null)
readBook();
}
}