// 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 org.apache.tapestry.IRequestCycle;
import org.apache.tapestry.annotations.InjectComponent;
import org.apache.tapestry.annotations.InjectPage;
import org.apache.tapestry.annotations.Persist;
import org.apache.tapestry.vlib.ActivatePage;
import org.apache.tapestry.vlib.components.Browser;
import org.apache.tapestry.vlib.ejb.IBookQuery;
import org.apache.tapestry.vlib.ejb.SortColumn;
import org.apache.tapestry.vlib.ejb.SortOrdering;
import org.apache.tapestry.vlib.services.RemoteCallback;
/**
* 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
*/
public abstract class MyLibrary extends ActivatePage
{
@Persist
public abstract IBookQuery getOwnedQuery();
public abstract void setOwnedQuery(IBookQuery value);
@Persist
public abstract SortColumn getSortColumn();
public abstract void setSortColumn(SortColumn column);
@Persist
public abstract boolean isDescending();
@InjectComponent("browser")
public abstract Browser getBrowser();
@InjectPage("EditBook")
public abstract EditBook getEditBook();
@InjectPage("ConfirmBookDelete")
public abstract ConfirmBookDelete getConfirmBookDelete();
public void finishLoad()
{
setSortColumn(SortColumn.TITLE);
}
public void activate()
{
runQuery();
getRequestCycle().activate(this);
}
public void requery(IRequestCycle cycle)
{
runQuery();
}
private void runQuery()
{
final Integer userId = getVisitState().getUserId();
final SortOrdering ordering = new SortOrdering(getSortColumn(), isDescending());
RemoteCallback<Integer> callback = new RemoteCallback()
{
public Integer doRemote() throws RemoteException
{
IBookQuery query = getOwnedQuery();
if (query == null)
{
query = getBookQuerySource().newQuery();
setOwnedQuery(query);
}
try
{
return query.ownerQuery(userId, ordering);
}
catch (RemoteException ex)
{
setOwnedQuery(null);
throw ex;
}
}
};
int count = getRemoteTemplate().execute(callback, "Error accessing owned books.");
Browser browser = getBrowser();
if (count != browser.getResultCount())
browser.initializeForResultCount(count);
}
/**
* Listener invoked to allow a user to edit a book.
*/
public void editBook(Integer bookId)
{
getEditBook().beginEdit(bookId);
}
/**
* Listener invoked to allow a user to delete a book.
*/
public void deleteBook(Integer bookId)
{
getConfirmBookDelete().selectBook(bookId);
}
}