// 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 org.apache.tapestry.IExternalPage;
import org.apache.tapestry.IRequestCycle;
import org.apache.tapestry.event.PageEvent;
import org.apache.tapestry.event.PageRenderListener;
import org.apache.tapestry.html.BasePage;
import org.apache.tapestry.vlib.VirtualLibraryEngine;
import org.apache.tapestry.vlib.components.Browser;
import org.apache.tapestry.vlib.ejb.IBookQuery;
import org.apache.tapestry.vlib.ejb.Person;
import org.apache.tapestry.vlib.ejb.SortColumn;
import org.apache.tapestry.vlib.ejb.SortOrdering;
/**
* Displays the book inventory list for a single {@link org.apache.tapestry.vlib.ejb.IPerson}, showing
* what books are owned by the person, who has them borrowed, etc. If the
* user is logged in, then books can be borrowed from this page as well.
*
* @author Howard Lewis Ship
* @version $Id: ViewPerson.java,v 1.12 2004/02/19 17:37:48 hlship Exp $
*
**/
public abstract class ViewPerson extends BasePage implements IExternalPage, PageRenderListener
{
public abstract Integer getPersonId();
public abstract void setPersonId(Integer personId);
public abstract void setPerson(Person value);
public abstract Person getPerson();
public abstract IBookQuery getQuery();
public abstract void setQuery(IBookQuery value);
public abstract SortColumn getSortColumn();
public abstract boolean isDescending();
private Browser _browser;
public void finishLoad()
{
_browser = (Browser) getComponent("browser");
}
/**
* Invoked by the external service to being viewing the
* identified person.
*
**/
public void activateExternalPage(Object[] parameters, IRequestCycle cycle)
{
Integer personId = (Integer) parameters[0];
setPersonId(personId);
// Force the query to be re-run when the person changes.
int count = runQuery();
_browser.initializeForResultCount(count);
}
public void requery(IRequestCycle cycle)
{
int count = runQuery();
if (_browser.getResultCount() != count)
_browser.setResultCount(count);
}
private int runQuery()
{
VirtualLibraryEngine vengine = (VirtualLibraryEngine) getEngine();
Integer personId = getPersonId();
SortOrdering ordering = new SortOrdering(getSortColumn(), isDescending());
int i = 0;
while (true)
{
IBookQuery query = getQuery();
if (query == null)
{
query = vengine.createNewQuery();
setQuery(query);
}
try
{
return query.ownerQuery(personId, ordering);
}
catch (RemoteException ex)
{
vengine.rmiFailure("Remote exception for owner query.", ex, i++);
setQuery(null);
}
}
}
public void pageBeginRender(PageEvent event)
{
Person person = getPerson();
if (person == null)
{
VirtualLibraryEngine vengine = (VirtualLibraryEngine) getEngine();
person = vengine.readPerson(getPersonId());
setPerson(person);
}
}
}