/*
* JBoss, Home of Professional Open Source.
* Copyright 2008, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.web.jsf.integration.injection;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.faces.context.FacesContext;
import javax.servlet.ServletContext;
import org.apache.InstanceManager;
import org.jboss.logging.Logger;
import org.jboss.web.tomcat.service.TomcatInjectionContainer;
import com.sun.faces.spi.InjectionProvider;
import com.sun.faces.spi.InjectionProviderException;
/**
* A JSF injection provider.
* The dynamic processing of annotations and injections is handled by the
* <code>TomcatInjectionContainer</code>.
*
* @author <a href="mailto:emuckenh@redhat.com">Emanuel Muckenhuber</a>
* @version $Revision: 85945 $
*/
public class JBossScanningInjectionProvider implements InjectionProvider
{
/** The injection container. */
protected TomcatInjectionContainer injectionContainer = null;
/** The logger. */
private static final Logger log = Logger.getLogger(InjectionProvider.class);
public JBossScanningInjectionProvider()
{
Object context = FacesContext.getCurrentInstance().getExternalContext().getContext();
// In case of a servletContext - could maybe also be a PortletContext !?
if (context != null && context instanceof ServletContext)
{
ServletContext servletContext = (ServletContext) (context);
this.injectionContainer = (TomcatInjectionContainer) servletContext
.getAttribute(InstanceManager.class.getName());
}
if (injectionContainer == null)
log.debug("JSF injection not available for this web deployment.");
}
protected JBossScanningInjectionProvider(TomcatInjectionContainer injectionContainer)
{
this.injectionContainer = injectionContainer;
if(injectionContainer == null)
log.debug("JSF injection not available for this web deployment.");
}
/**
* Invoke a postConstruct method annotated with @PostConstruct
*
* @param managedBean the managed bean
* @throws InjectionProviderException
*/
public void invokePostConstruct(Object managedBean) throws InjectionProviderException
{
try
{
Method postConstruct = getLifeCycleMethod(managedBean, PostConstruct.class);
if (postConstruct != null)
{
boolean accessibility = postConstruct.isAccessible();
postConstruct.setAccessible(true);
postConstruct.invoke(managedBean);
postConstruct.setAccessible(accessibility);
}
}
catch (Exception e)
{
throw new InjectionProviderException("PostConstruct failed on managed bean.", e);
}
}
/**
* Invoke a preDestroy method annotated with @PreDestroy
*
* @param managedBean the managed bean
* @throws InjectionProviderException
*/
public void invokePreDestroy(Object managedBean) throws InjectionProviderException
{
try
{
Method preDestroy = getLifeCycleMethod(managedBean, PreDestroy.class);
if (preDestroy != null)
{
boolean accessibility = preDestroy.isAccessible();
preDestroy.setAccessible(true);
preDestroy.invoke(managedBean);
preDestroy.setAccessible(accessibility);
}
}
catch (Exception e)
{
throw new InjectionProviderException("PreDestroy failed on managed bean.", e);
}
}
/**
* Process annotations and injection for a managedBean.
* This delegates the processing of annotations and injection
* to the <code>TomcatInjectionContainer</code>.
*
* @param managedBean the managed bean
* @throws InjectionProviderException
*/
public void inject(Object managedBean) throws InjectionProviderException
{
if(! checkInjectionContainer()) return;
try
{
// Process annotations
injectionContainer.processAnnotations(managedBean);
// Process injectors
injectionContainer.processInjectors(managedBean);
}
catch(Exception e)
{
throw new InjectionProviderException("Injection failed on managed bean.", e);
}
}
private Method getLifeCycleMethod(Object managedBean, Class<? extends Annotation> annotation)
{
Method[] methods = managedBean.getClass().getDeclaredMethods();
Method lifeCycleMethod = null;
for (int i = 0; i < methods.length; i++)
{
if (methods[i].isAnnotationPresent(annotation))
{
if ((lifeCycleMethod != null) || (methods[i].getParameterTypes().length != 0)
|| (Modifier.isStatic(methods[i].getModifiers())) || (methods[i].getExceptionTypes().length > 0)
|| (!methods[i].getReturnType().getName().equals("void")))
{
throw new IllegalArgumentException("Invalid PostConstruct method.");
}
lifeCycleMethod = methods[i];
}
}
return lifeCycleMethod;
}
private boolean checkInjectionContainer()
{
return injectionContainer != null;
}
}