// 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.admin;
import java.rmi.RemoteException;
import java.util.List;
import javax.ejb.FinderException;
import org.apache.hivemind.ApplicationRuntimeException;
import org.apache.tapestry.IRequestCycle;
import org.apache.tapestry.Tapestry;
import org.apache.tapestry.event.PageEvent;
import org.apache.tapestry.event.PageRenderListener;
import org.apache.tapestry.form.IPropertySelectionModel;
import org.apache.tapestry.vlib.AdminPage;
import org.apache.tapestry.vlib.EntitySelectionModel;
import org.apache.tapestry.vlib.IErrorProperty;
import org.apache.tapestry.vlib.IMessageProperty;
import org.apache.tapestry.vlib.VirtualLibraryEngine;
import org.apache.tapestry.vlib.ejb.Book;
import org.apache.tapestry.vlib.ejb.IBookQuery;
import org.apache.tapestry.vlib.ejb.IOperations;
import org.apache.tapestry.vlib.ejb.Person;
/**
* Second page in Transfer Books wizard; allows the books owned by the
* from user to be selected and transfered to the target user.
*
* @author Howard Lewis Ship
* @version $Id: TransferBooksTransfer.java,v 1.11 2004/04/30 15:17:21 hlship Exp $
* @since 3.0
*
**/
public abstract class TransferBooksTransfer extends AdminPage implements PageRenderListener
{
public abstract Person getFromUser();
public abstract void setFromUser(Person fromUser);
public abstract Integer getFromUserId();
public abstract void setFromUserId(Integer fromUserId);
public abstract Integer getToUserId();
public abstract void setToUserId(Integer toUserId);
public abstract Person getToUser();
public abstract void setToUser(Person toUser);
public abstract List getSelectedBooks();
public abstract IPropertySelectionModel getUserBookModel();
public abstract void setUserBookModel(IPropertySelectionModel userBookModel);
public void activate(IRequestCycle cycle, Integer fromUserId, Integer toUserId)
{
Person fromUser = readPerson(fromUserId);
IPropertySelectionModel model = buildUserBookModel(fromUser);
if (model.getOptionCount() == 0)
{
IErrorProperty page = (IErrorProperty) cycle.getPage();
page.setError(format("user-has-no-books", fromUser.getNaturalName()));
return;
}
setFromUserId(fromUserId);
setFromUser(fromUser);
setToUserId(toUserId);
setUserBookModel(model);
cycle.activate(this);
}
/**
* Only properties toUserPK and fromUserPK are persistent. We need to refresh
* the fromUser, toUser and userBookModel properties at the start
* of each request cycle.
*
**/
public void pageBeginRender(PageEvent event)
{
Person fromUser = getFromUser();
if (fromUser == null)
{
fromUser = readPerson(getFromUserId());
setFromUser(fromUser);
}
if (getUserBookModel() == null)
setUserBookModel(buildUserBookModel(fromUser));
Person toUser = getToUser();
if (toUser == null)
{
toUser = readPerson(getToUserId());
setToUser(toUser);
}
}
public void formSubmit(IRequestCycle cycle)
{
List selectedBooks = getSelectedBooks();
int count = Tapestry.size(selectedBooks);
if (count == 0)
{
setError(getMessage("no-books-selected"));
return;
}
Integer[] keys = (Integer[]) selectedBooks.toArray(new Integer[count]);
Person toUser = getToUser();
VirtualLibraryEngine vengine = (VirtualLibraryEngine) getEngine();
int i = 0;
while (true)
{
try
{
IOperations operations = vengine.getOperations();
operations.transferBooks(toUser.getId(), keys);
break;
}
catch (FinderException ex)
{
throw new ApplicationRuntimeException(ex);
}
catch (RemoteException ex)
{
vengine.rmiFailure("Unable to transfer ownership of books.", ex, i++);
}
}
Person fromUser = getFromUser();
IMessageProperty selectPage = (TransferBooksSelect) cycle.getPage("TransferBooksSelect");
selectPage.setMessage(
format(
"transfered-books",
Integer.toString(count),
fromUser.getNaturalName(),
toUser.getNaturalName()));
cycle.activate(selectPage);
}
private IPropertySelectionModel buildUserBookModel(Person user)
{
VirtualLibraryEngine vengine = (VirtualLibraryEngine) getEngine();
Book[] books = null;
int i = 0;
while (true)
{
books = null;
try
{
IBookQuery query = vengine.createNewQuery();
int count = query.ownerQuery(user.getId(), null);
if (count > 0)
books = query.get(0, count);
break;
}
catch (RemoteException ex)
{
vengine.rmiFailure(
"Unable to retrieve books owned by " + user.getNaturalName() + ".",
ex,
i++);
}
}
EntitySelectionModel model = new EntitySelectionModel();
if (books != null)
for (i = 0; i < books.length; i++)
model.add(books[i].getId(), books[i].getTitle());
return model;
}
private Person readPerson(Integer personId)
{
VirtualLibraryEngine vengine = (VirtualLibraryEngine) getEngine();
return vengine.readPerson(personId);
}
}