// Copyright 2004, 2005 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.util.List;
import javax.ejb.FinderException;
import org.apache.hivemind.ApplicationRuntimeException;
import org.apache.tapestry.PageRedirectException;
import org.apache.tapestry.Tapestry;
import org.apache.tapestry.annotations.InjectPage;
import org.apache.tapestry.annotations.Message;
import org.apache.tapestry.event.PageBeginRenderListener;
import org.apache.tapestry.event.PageEvent;
import org.apache.tapestry.form.IPropertySelectionModel;
import org.apache.tapestry.vlib.EntitySelectionModel;
import org.apache.tapestry.vlib.Protected;
import org.apache.tapestry.vlib.VirtualLibraryEngine;
import org.apache.tapestry.vlib.Visit;
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;
/**
* Used to manage giving away of books to other users.
*
* @author Howard Lewis Ship
* @since 3.0
*/
public abstract class GiveAwayBooks extends Protected implements PageBeginRenderListener
{
public abstract IPropertySelectionModel getBooksModel();
public abstract void setBooksModel(IPropertySelectionModel booksModel);
public abstract IPropertySelectionModel getPersonModel();
public abstract void setPersonModel(IPropertySelectionModel personModel);
public abstract List getSelectedBooks();
public abstract Integer getTargetUserId();
@Message
public abstract String updateFailure();
@Message
public abstract String selectAtLeastOneBook(String targetName);
@Message
public abstract String transferedBooks(int count, String targetName);
@Message
public abstract String readUsersFailure();
@Message
public abstract String readBooksFailure();
@InjectPage("MyLibrary")
public abstract MyLibrary getMyLibrary();
public void formSubmit()
{
VirtualLibraryEngine vengine = (VirtualLibraryEngine) getEngine();
Integer targetUserId = getTargetUserId();
Person target = vengine.readPerson(targetUserId);
List selectedBooks = getSelectedBooks();
int count = Tapestry.size(selectedBooks);
if (count == 0)
{
setError(selectAtLeastOneBook(target.getNaturalName()));
return;
}
Integer[] bookIds = (Integer[]) selectedBooks.toArray(new Integer[count]);
int i = 0;
while (true)
{
IOperations operations = vengine.getOperations();
try
{
operations.transferBooks(targetUserId, bookIds);
break;
}
catch (FinderException ex)
{
throw new ApplicationRuntimeException(ex);
}
catch (RemoteException ex)
{
vengine.rmiFailure(updateFailure(), ex, i++);
}
}
MyLibrary myLibrary = getMyLibrary();
myLibrary.setMessage(transferedBooks(count, target.getNaturalName()));
myLibrary.activate();
}
private IPropertySelectionModel buildPersonModel()
{
VirtualLibraryEngine vengine = (VirtualLibraryEngine) getEngine();
Visit visit = (Visit) vengine.getVisit();
Integer userPK = visit.getUserId();
Person[] persons = null;
int i = 0;
while (true)
{
IOperations operations = vengine.getOperations();
try
{
persons = operations.getPersons();
break;
}
catch (RemoteException ex)
{
vengine.rmiFailure(readUsersFailure(), ex, i++);
}
}
EntitySelectionModel result = new EntitySelectionModel();
for (i = 0; i < persons.length; i++)
{
Person p = persons[i];
Integer pk = p.getId();
if (pk.equals(userPK))
continue;
result.add(pk, p.getNaturalName());
}
return result;
}
public void pageBeginRender(PageEvent event)
{
IPropertySelectionModel model = getBooksModel();
if (model == null)
{
model = buildBooksModel();
setBooksModel(model);
}
model = getPersonModel();
if (model == null)
{
model = buildPersonModel();
setPersonModel(model);
}
}
private IPropertySelectionModel buildBooksModel()
{
VirtualLibraryEngine vengine = (VirtualLibraryEngine) getEngine();
Visit visit = (Visit) vengine.getVisit();
Integer userPK = visit.getUserId();
Book[] books = null;
int i = 0;
while (true)
{
books = null;
try
{
IBookQuery query = vengine.createNewQuery();
int count = query.ownerQuery(userPK, null);
if (count > 0)
books = query.get(0, count);
break;
}
catch (RemoteException ex)
{
vengine.rmiFailure(readBooksFailure(), ex, i++);
}
}
EntitySelectionModel result = new EntitySelectionModel();
if (books != null)
for (i = 0; i < books.length; i++)
result.add(books[i].getId(), books[i].getTitle());
return result;
}
public void pageValidate(PageEvent event)
{
super.pageValidate(event);
IPropertySelectionModel model = buildBooksModel();
if (model.getOptionCount() == 0)
{
MyLibrary page = getMyLibrary();
page.activate();
throw new PageRedirectException(page);
}
setBooksModel(model);
}
}