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package com.sun.faces.context;
import java.lang.reflect.Field;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.text.MessageFormat;
import javax.faces.context.ExternalContext;
import javax.faces.context.FacesContextFactory;
import javax.faces.context.FacesContext;
import javax.faces.lifecycle.Lifecycle;
import javax.faces.FacesException;
import com.sun.faces.util.FacesLogger;
import com.sun.faces.util.Util;
import javax.faces.FacesWrapper;
import javax.servlet.ServletRequest;
/**
* This {@link FacesContextFactory} is responsible for injecting the
* default {@link FacesContext} instance into the top-level {@link FacesContext}
* 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 InjectionFacesContextFactory extends FacesContextFactory implements FacesWrapper {
private static final Logger LOGGER = FacesLogger.CONTEXT.getLogger();
private FacesContextFactory delegate;
private Field defaultFacesContext;
private Field defaultExternalContext;
// ------------------------------------------------------------ Constructors
public InjectionFacesContextFactory(FacesContextFactory delegate) {
Util.notNull("facesContextFactory", delegate);
this.delegate = delegate;
try {
defaultFacesContext = FacesContext.class.getDeclaredField("defaultFacesContext");
defaultFacesContext.setAccessible(true);
} catch (NoSuchFieldException nsfe) {
if (LOGGER.isLoggable(Level.FINE)) {
LOGGER.log(Level.FINE, "Unable to find private field named 'defaultFacesContext' in javax.faces.context.FacesContext.");
}
} catch (Exception e) {
if (LOGGER.isLoggable(Level.SEVERE)) {
LOGGER.log(Level.SEVERE, e.toString(), e);
}
defaultFacesContext = null;
}
try {
defaultExternalContext = ExternalContext.class.getDeclaredField("defaultExternalContext");
defaultExternalContext.setAccessible(true);
} catch (NoSuchFieldException nsfe) {
if (LOGGER.isLoggable(Level.FINE)) {
LOGGER.log(Level.FINE, "Unable to find private field named 'defaultExternalContext' in javax.faces.context.ExternalContext.");
}
} catch (Exception e) {
if (LOGGER.isLoggable(Level.SEVERE)) {
LOGGER.log(Level.SEVERE, e.toString(), e);
}
defaultExternalContext = null;
}
}
// ---------------------------------------- Methods from FacesContextFactory
public FacesContext getFacesContext(Object context,
Object request,
Object response,
Lifecycle lifecycle)
throws FacesException {
FacesContext ctx = delegate.getFacesContext(context,
request,
response,
lifecycle);
if (ctx == null) {
// No i18n here
String message = MessageFormat
.format("Delegate FacesContextFactory, {0}, returned null when calling getFacesContext().",
delegate.getClass().getName());
throw new IllegalStateException(message);
}
injectDefaults(ctx, request);
return ctx;
}
// ----------------------------------------------- Methods from FacesWrapper
@Override
public FacesContextFactory getWrapped() {
return delegate;
}
// --------------------------------------------------------- Private Methods
private void injectDefaults(FacesContext target, Object request) {
if (defaultFacesContext != null) {
FacesContext defaultFC =
FacesContextImpl.getDefaultFacesContext();
if (defaultFC != null) {
try {
defaultFacesContext.set(target, defaultFC);
} catch (IllegalAccessException e) {
if (LOGGER.isLoggable(Level.SEVERE)) {
LOGGER.log(Level.SEVERE, e.toString(), e);
}
}
}
}
if (defaultExternalContext != null) {
ExternalContext defaultExtContext = null;
if (request instanceof ServletRequest) {
ServletRequest reqObj = (ServletRequest) request;
defaultExtContext = (ExternalContext) reqObj.getAttribute(ExternalContextFactoryImpl.DEFAULT_EXTERNAL_CONTEXT_KEY);
if (defaultExtContext != null) {
reqObj.removeAttribute(ExternalContextFactoryImpl.DEFAULT_EXTERNAL_CONTEXT_KEY);
}
}
if (defaultExtContext != null) {
try {
defaultExternalContext.set(target.getExternalContext(), defaultExtContext);
} catch (IllegalAccessException e) {
if (LOGGER.isLoggable(Level.SEVERE)) {
LOGGER.log(Level.SEVERE, e.toString(), e);
}
}
}
}
}
}
