// 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.HashMap;
import java.util.Map;
import javax.ejb.CreateException;
import javax.ejb.FinderException;
import org.apache.hivemind.ApplicationRuntimeException;
import org.apache.tapestry.IRequestCycle;
import org.apache.tapestry.Tapestry;
import org.apache.tapestry.event.PageEvent;
import org.apache.tapestry.event.PageRenderListener;
import org.apache.tapestry.vlib.Protected;
import org.apache.tapestry.vlib.VirtualLibraryEngine;
import org.apache.tapestry.vlib.ejb.IOperations;
/**
* Edits the properties of at book.
*
* @author Howard Lewis Ship
*/
public abstract class EditBook extends Protected implements PageRenderListener
{
public abstract Map getAttributes();
public abstract void setAttributes(Map attributes);
public abstract String getPublisherName();
public abstract Integer getBookId();
public abstract void setBookId(Integer bookId);
/**
* Invoked (from {@link MyLibrary}) to begin editting a book. Gets the attributes from the
* {@link org.apache.tapestry.vlib.ejb.IBook} and updates the request cycle to render this page,
*/
public void beginEdit(IRequestCycle cycle, Integer bookId)
{
setBookId(bookId);
VirtualLibraryEngine vengine = (VirtualLibraryEngine) getEngine();
int i = 0;
while (true)
{
try
{
// Get the attributes as a source for our input fields.
IOperations operations = vengine.getOperations();
setAttributes(operations.getBookAttributes(bookId));
break;
}
catch (FinderException ex)
{
throw new ApplicationRuntimeException(ex);
}
catch (RemoteException ex)
{
vengine.rmiFailure(
"Remote exception setting up page for book #" + bookId + ".",
ex,
i++);
}
}
cycle.activate(this);
}
/**
* Used to update the book when the form is submitted.
*/
public void formSubmit(IRequestCycle cycle)
{
Map attributes = getAttributes();
Integer publisherId = (Integer) attributes.get("publisherId");
String publisherName = getPublisherName();
if (publisherId == null && Tapestry.isBlank(publisherName))
{
setErrorField("inputPublisherName", getMessage("need-publisher-name"));
return;
}
if (publisherId != null && Tapestry.isNonBlank(publisherName))
{
setErrorField("inputPublisherName", getMessage("leave-publisher-name-empty"));
return;
}
// Check for an error from a validation field
if (isInError())
return;
// OK, do the update.
VirtualLibraryEngine vengine = (VirtualLibraryEngine) cycle.getEngine();
Integer bookId = getBookId();
int i = 0;
while (true)
{
IOperations bean = vengine.getOperations();
try
{
if (publisherId != null)
bean.updateBook(bookId, attributes);
else
{
bean.updateBook(bookId, attributes, publisherName);
vengine.clearCache();
}
break;
}
catch (FinderException ex)
{
throw new ApplicationRuntimeException(ex);
}
catch (CreateException ex)
{
throw new ApplicationRuntimeException(ex);
}
catch (RemoteException ex)
{
vengine.rmiFailure("Remote exception updating book #" + bookId + ".", ex, i++);
continue;
}
}
MyLibrary page = (MyLibrary) cycle.getPage("MyLibrary");
page.setMessage(format("updated-book", attributes.get("title")));
page.activate(cycle);
}
public void pageBeginRender(PageEvent event)
{
if (getAttributes() == null)
setAttributes(new HashMap());
}
}