com.sun.faces.application.InjectionApplicationFactory Maven / Gradle / Ivy
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package com.sun.faces.application;
import java.lang.reflect.Field;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.text.MessageFormat;
import javax.faces.application.ApplicationFactory;
import javax.faces.application.Application;
import javax.faces.context.FacesContext;
import com.sun.faces.util.FacesLogger;
import com.sun.faces.util.Util;
import java.util.Map;
import javax.faces.FacesWrapper;
/**
* This {@link javax.faces.application.ApplicationFactory} is responsible for injecting the
* default {@link Application} instance into the top-level {@link Application}
* as configured by the runtime. Doing this allows us to preserve backwards
* compatibility as the API evolves without having the API rely on implementation
* specific details.
*/
public class InjectionApplicationFactory extends ApplicationFactory implements FacesWrapper {
private static final Logger LOGGER = FacesLogger.APPLICATION.getLogger();
private ApplicationFactory delegate;
private Application defaultApplication;
private Field defaultApplicationField;
private volatile Application application;
// ------------------------------------------------------------ Constructors
public InjectionApplicationFactory(ApplicationFactory delegate) {
Util.notNull("applicationFactory", delegate);
this.delegate = delegate;
}
// ----------------------------------------- Methods from ApplicationFactory
public Application getApplication() {
if (application == null) {
application = delegate.getApplication();
if (application == null) {
// No i18n here
String message = MessageFormat
.format("Delegate ApplicationContextFactory, {0}, returned null when calling getApplication().",
delegate.getClass().getName());
throw new IllegalStateException(message);
}
injectDefaultApplication();
}
return application;
}
public synchronized void setApplication(Application application) {
this.application = application;
delegate.setApplication(application);
injectDefaultApplication();
}
// ----------------------------------------------- Methods from FacesWrapper
@Override
public ApplicationFactory getWrapped() {
return delegate;
}
// --------------------------------------------------------- Private Methods
private void injectDefaultApplication() {
if (defaultApplication == null) {
FacesContext ctx = FacesContext.getCurrentInstance();
defaultApplication = InjectionApplicationFactory.
removeApplicationInstance(ctx.getExternalContext().getApplicationMap());
}
if (defaultApplication != null) {
try {
if (defaultApplicationField == null) {
defaultApplicationField =
Application.class
.getDeclaredField("defaultApplication");
defaultApplicationField.setAccessible(true);
}
defaultApplicationField.set(application, defaultApplication);
} catch (NoSuchFieldException nsfe) {
if (LOGGER.isLoggable(Level.FINE)) {
LOGGER.log(Level.FINE, "Unable to find private field named 'defaultApplication' in javax.faces.application.Application.");
}
} catch (Exception e) {
if (LOGGER.isLoggable(Level.SEVERE)) {
LOGGER.log(Level.SEVERE, e.toString(), e);
}
}
}
}
// ------------------------------------------------- Package private Methods
static void setApplicationInstance(Application app) {
Map appMap = FacesContext.getCurrentInstance().getExternalContext().getApplicationMap();
appMap.put(InjectionApplicationFactory.class.getName(), app);
}
static Application removeApplicationInstance(Map appMap) {
return (Application) appMap.remove(InjectionApplicationFactory.class.getName());
}
}