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package com.sun.faces.application;
import static com.sun.faces.util.Util.notNull;
import static java.text.MessageFormat.format;
import static java.util.logging.Level.FINE;
import static java.util.logging.Level.SEVERE;
import java.lang.reflect.Field;
import java.util.Map;
import java.util.logging.Logger;
import javax.faces.application.Application;
import javax.faces.application.ApplicationFactory;
import javax.faces.context.FacesContext;
import com.sun.faces.util.FacesLogger;
/**
* 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 {
private static final Logger LOGGER = FacesLogger.APPLICATION.getLogger();
private Application defaultApplication;
private Field defaultApplicationField;
private volatile Application application;
// ------------------------------------------------------------ Constructors
public InjectionApplicationFactory(ApplicationFactory delegate) {
super(delegate);
notNull("applicationFactory", delegate);
}
// ----------------------------------------- Methods from ApplicationFactory
@Override
public Application getApplication() {
if (application == null) {
application = getWrapped().getApplication();
if (application == null) {
throw new IllegalStateException(
format("Delegate ApplicationContextFactory, {0}, returned null when calling getApplication().", getWrapped().getClass().getName()));
}
injectDefaultApplication();
}
return application;
}
@Override
public synchronized void setApplication(Application application) {
this.application = application;
getWrapped().setApplication(application);
injectDefaultApplication();
}
// --------------------------------------------------------- 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(FINE)) {
LOGGER.log(FINE, "Unable to find private field named 'defaultApplication' in javax.faces.application.Application.");
}
} catch (SecurityException | IllegalArgumentException | IllegalAccessException e) {
if (LOGGER.isLoggable(SEVERE)) {
LOGGER.log(SEVERE, e.toString(), e);
}
}
}
}
// ------------------------------------------------- Package private Methods
static void setApplicationInstance(Application app) {
FacesContext.getCurrentInstance().getExternalContext().getApplicationMap().put(InjectionApplicationFactory.class.getName(), app);
}
static Application removeApplicationInstance(Map<String, Object> appMap) {
return (Application) appMap.remove(InjectionApplicationFactory.class.getName());
}
}