// 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.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 the user's books, allowing books to be editted or
* even deleted.
*
* <p>Note that, unlike elsewhere, book titles do not link to the
* {@link ViewBook} page. It seems to me there would be a conflict between
* that behavior and the edit behavior; making the book titles not be links
* removes the ambiguity over what happens when the book title is clicked
* (view vs. edit).
*
* @author Howard Lewis Ship
* @version $Id: MyLibrary.java,v 1.16 2004/02/19 17:37:48 hlship Exp $
*
**/
public abstract class MyLibrary
extends ActivatePage
implements IMessageProperty
{
public abstract void setOwnedQuery(IBookQuery value);
public abstract IBookQuery getOwnedQuery();
public abstract SortColumn getSortColumn();
public abstract boolean isDescending();
private Browser _browser;
public void finishLoad()
{
_browser = (Browser) getComponent("browser");
}
public void activate(IRequestCycle cycle)
{
runQuery();
cycle.activate(this);
}
public void requery(IRequestCycle cycle)
{
runQuery();
}
private void runQuery()
{
Visit visit = (Visit) getVisit();
Integer userId = visit.getUserId();
VirtualLibraryEngine vengine = (VirtualLibraryEngine) getEngine();
SortOrdering ordering = new SortOrdering(getSortColumn(), isDescending());
int i = 0;
while (true)
{
try
{
IBookQuery query = getOwnedQuery();
if (query == null)
{
query = vengine.createNewQuery();
setOwnedQuery(query);
}
int count = query.ownerQuery(userId, ordering);
if (count != _browser.getResultCount())
_browser.initializeForResultCount(count);
break;
}
catch (RemoteException ex)
{
vengine.rmiFailure("Remote exception accessing owned books.", ex, i++);
setOwnedQuery(null);
}
}
}
/**
* Listener invoked to allow a user to edit a book.
*
**/
public void editBook(IRequestCycle cycle)
{
Object[] parameters = cycle.getServiceParameters();
Integer bookId = (Integer) parameters[0];
EditBook page = (EditBook) cycle.getPage("EditBook");
page.beginEdit(cycle, bookId);
}
/**
* Listener invoked to allow a user to delete a book.
*
**/
public void deleteBook(IRequestCycle cycle)
{
Object[] parameters = cycle.getServiceParameters();
Integer bookId = (Integer) parameters[0];
ConfirmBookDelete page = (ConfirmBookDelete) cycle.getPage("ConfirmBookDelete");
page.selectBook(bookId, cycle);
}
private void returnBook(Integer bookId)
{
VirtualLibraryEngine vengine = (VirtualLibraryEngine) getEngine();
int i = 0;
while (true)
{
try
{
IOperations operations = vengine.getOperations();
Book book = operations.returnBook(bookId);
setMessage(format("returned-book", book.getTitle()));
break;
}
catch (FinderException ex)
{
setError(format("unable-to-return-book", ex.getMessage()));
return;
}
catch (RemoteException ex)
{
vengine.rmiFailure("Remote exception returning book.", ex, i++);
}
}
runQuery();
}
}