// 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 org.apache.hivemind.ApplicationRuntimeException;
import org.apache.tapestry.IRequestCycle;
import org.apache.tapestry.vlib.ActivatePage;
import org.apache.tapestry.vlib.IMessageProperty;
import org.apache.tapestry.vlib.VirtualLibraryEngine;
import org.apache.tapestry.vlib.Visit;
import org.apache.tapestry.vlib.components.Browser;
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.SortColumn;
import org.apache.tapestry.vlib.ejb.SortOrdering;
/**
* Shows a list of books the user has borrowed.
*
* @author Howard Lewis Ship
* @version $Id: BorrowedBooks.java,v 1.15 2004/04/30 15:17:21 hlship Exp $
*
**/
public abstract class BorrowedBooks extends ActivatePage implements IMessageProperty
{
private Browser _browser;
public abstract void setBorrowedQuery(IBookQuery value);
public abstract IBookQuery getBorrowedQuery();
public abstract SortColumn getSortColumn();
public abstract boolean isDescending();
public void finishLoad()
{
_browser = (Browser) getComponent("browser");
}
public void activate(IRequestCycle cycle)
{
runQuery();
cycle.activate(this);
}
/**
* Invoked as listener method after the sortColumn or
* descending properties are changed.
*
* @param cycle
* @since 3.0
*
*
**/
public void requery(IRequestCycle cycle)
{
runQuery();
}
private void runQuery()
{
Visit visit = (Visit) getVisit();
Integer userPK = visit.getUserId();
VirtualLibraryEngine vengine = (VirtualLibraryEngine) getEngine();
SortOrdering ordering = new SortOrdering(getSortColumn(), isDescending());
int i = 0;
while (true)
{
try
{
IBookQuery query = getBorrowedQuery();
if (query == null)
{
query = vengine.createNewQuery();
setBorrowedQuery(query);
}
int count = query.borrowerQuery(userPK, ordering);
if (count != _browser.getResultCount())
_browser.initializeForResultCount(count);
break;
}
catch (RemoteException ex)
{
vengine.rmiFailure("Remote exception finding borrowed books.", ex, i++);
setBorrowedQuery(null);
}
}
}
/**
* Listener used to return a book.
*
**/
public void returnBook(IRequestCycle cycle)
{
Object[] parameters = cycle.getServiceParameters();
Integer bookPK = (Integer) parameters[0];
VirtualLibraryEngine vengine = (VirtualLibraryEngine) getEngine();
IOperations operations = vengine.getOperations();
try
{
Book book = operations.returnBook(bookPK);
setMessage(format("returned-book", book.getTitle()));
runQuery();
}
catch (FinderException ex)
{
setError(format("unable-to-return-book", ex.getMessage()));
return;
}
catch (RemoteException ex)
{
throw new ApplicationRuntimeException(ex);
}
}
}