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package javax.faces.webapp;
import java.util.logging.Logger;
import java.util.logging.Level;
import java.util.LinkedList;
import java.util.Collections;
import java.util.Iterator;
import javax.faces.context.ExceptionHandlerFactory;
import javax.faces.context.ExceptionHandler;
import javax.faces.FacesException;
import javax.faces.component.UIComponent;
import javax.faces.event.ExceptionQueuedEvent;
import javax.faces.event.SystemEvent;
import javax.faces.event.AbortProcessingException;
import javax.faces.event.ExceptionQueuedEventContext;
import javax.faces.event.PhaseId;
import javax.el.ELException;
import javax.faces.application.FacesMessage;
import javax.faces.component.UpdateModelException;
import javax.faces.context.FacesContext;
/**
* <p class="changed_added_2_0">This {@link ExceptionHandlerFactory} instance
* produces JSF 1.2 compatible
* {@link ExceptionHandler} instances. The {@link ExceptionHandler#handle}
* method of the <code>ExceptionHandler</code> produced by this factory must
* meet the following requirements</p>
* <div class="changed_added_2_0">
*
* <ul>
*
* <li><p>Any
* exceptions thrown before or after phase execution will be logged and
* swallowed.</p></li>
*
* <li><p>The implementation must examine
* the <code>Exception</code> within each of the unhandled exception
* events. If the <code>Exception</code> is an instance of
* {@link UpdateModelException}, extract the {@link FacesMessage} from
* the <code>UpdateModelException</code>. Log a <code>SEVERE</code>
* message to the log and queue the <code>FacesMessage</code>
* on the {@link FacesContext}, using the <code>clientId</code> of
* the source component in a call to
* {@link FacesContext#addMessage(java.lang.String, javax.faces.application.FacesMessage)}</p></li>
*
* </ul>
*
* </div>
*
* @since 2.0
*/
public class PreJsf2ExceptionHandlerFactory extends ExceptionHandlerFactory {
public PreJsf2ExceptionHandlerFactory() {
}
// ------------------------------------ Methods from ExceptionHandlerFactory
/**
* @return a new {@link ExceptionHandler} that behaves in a fashion compatible
* with specifications prior to JavaServerFaces 1.2
*/
public ExceptionHandler getExceptionHandler() {
return new PreJsf2ExceptionHandler();
}
// ---------------------------------------------------------- Nested Classes
/**
* JSF 1.2-style <code>ExceptionHandler</code> implementation.
*/
private static final class PreJsf2ExceptionHandler extends ExceptionHandler {
private static final Logger LOGGER =
Logger.getLogger("javax.faces.webapp", "javax.faces.LogStrings");
private static final String LOG_BEFORE_KEY =
"servere.webapp.prejsf2.exception.handler.log_before";
private static final String LOG_AFTER_KEY =
"servere.webapp.prejsf2.exception.handler.log_after";
private static final String LOG_KEY =
"servere.webapp.prejsf2.exception.handler.log";
private LinkedList<ExceptionQueuedEvent> unhandledExceptions;
private LinkedList<ExceptionQueuedEvent> handledExceptions;
private ExceptionQueuedEvent handled;
// ------------------------------------------- Methods from ExceptionHandler
/**
* @see ExceptionHandler@getHandledExceptionQueuedEvent()
*/
public ExceptionQueuedEvent getHandledExceptionQueuedEvent() {
return handled;
}
/**
*
*
* @since 2.0
*/
public void handle() throws FacesException {
for (Iterator<ExceptionQueuedEvent> i = getUnhandledExceptionQueuedEvents().iterator(); i.hasNext();) {
ExceptionQueuedEvent event = i.next();
ExceptionQueuedEventContext context =
(ExceptionQueuedEventContext) event.getSource();
try {
Throwable t = context.getException();
if (isRethrown(t, (context.inBeforePhase() || context.inAfterPhase()))) {
handled = event;
Throwable unwrapped = getRootCause(t);
if (unwrapped != null) {
throw new FacesException(unwrapped.getMessage(), unwrapped);
} else {
if (t instanceof FacesException) {
throw (FacesException) t;
} else {
throw new FacesException(t.getMessage(), t);
}
}
} else {
log(context);
}
} finally {
if (handledExceptions == null) {
handledExceptions =
new LinkedList<ExceptionQueuedEvent>();
}
handledExceptions.add(event);
i.remove();
}
}
}
/**
* @see javax.faces.context.ExceptionHandler#isListenerForSource(Object)
*/
public boolean isListenerForSource(Object source) {
return (source instanceof ExceptionQueuedEventContext);
}
/**
* @see javax.faces.context.ExceptionHandler#processEvent(javax.faces.event.SystemEvent)
*/
public void processEvent(SystemEvent event)
throws AbortProcessingException {
if (event != null) {
if (unhandledExceptions == null) {
unhandledExceptions = new LinkedList<ExceptionQueuedEvent>();
}
unhandledExceptions.add((ExceptionQueuedEvent) event);
}
}
/**
* @see ExceptionHandler#getRootCause(Throwable)
*/
public Throwable getRootCause(Throwable t) {
if (t == null) {
return null;
}
if (shouldUnwrap(t.getClass())) {
Throwable root = t.getCause();
if (root != null) {
Throwable tmp = getRootCause(root);
if (tmp == null) {
return root;
} else {
return tmp;
}
} else {
return t;
}
}
return t;
}
/**
* @see javax.faces.context.ExceptionHandler#getUnhandledExceptionQueuedEvents()
*/
public Iterable<ExceptionQueuedEvent> getUnhandledExceptionQueuedEvents() {
return ((unhandledExceptions != null)
? unhandledExceptions
: Collections.<ExceptionQueuedEvent>emptyList());
}
/**
* @return
*
* @see javax.faces.context.ExceptionHandler#getHandledExceptionQueuedEvents()
*/
public Iterable<ExceptionQueuedEvent> getHandledExceptionQueuedEvents() {
return ((handledExceptions != null)
? handledExceptions
: Collections.<ExceptionQueuedEvent>emptyList());
}
// --------------------------------------------------------- Private Methods
/**
* @param c <code>Throwable</code> implementation class
*
* @return <code>true</code> if <code>c</code> is FacesException.class or
* ELException.class
*/
private boolean shouldUnwrap(Class<? extends Throwable> c) {
return (FacesException.class.equals(c) || ELException.class.equals(c));
}
private boolean isRethrown(Throwable t, boolean isBeforeOrAfterPhase) {
return (!isBeforeOrAfterPhase &&
!(t instanceof AbortProcessingException) &&
!(t instanceof UpdateModelException));
}
private void log(ExceptionQueuedEventContext exceptionContext) {
Throwable t = exceptionContext.getException();
UIComponent c = exceptionContext.getComponent();
if (t instanceof UpdateModelException) {
FacesContext context = FacesContext.getCurrentInstance();
FacesMessage message = ((UpdateModelException)t).getFacesMessage();
LOGGER.log(Level.SEVERE, message.getSummary(), t.getCause());
context.addMessage(c.getClientId(context), message);
} else {
boolean beforePhase = exceptionContext.inBeforePhase();
boolean afterPhase = exceptionContext.inAfterPhase();
PhaseId phaseId = exceptionContext.getPhaseId();
String key = getLoggingKey(beforePhase, afterPhase);
if (LOGGER.isLoggable(Level.SEVERE)) {
LOGGER.log(Level.SEVERE,
key,
new Object[]{t.getClass().getName(),
phaseId.toString(),
((c != null)
? c.getClientId(exceptionContext.getContext())
: ""),
t.getMessage()});
LOGGER.log(Level.SEVERE, t.getMessage(), t);
}
}
}
private String getLoggingKey(boolean beforePhase, boolean afterPhase) {
if (beforePhase) {
return LOG_BEFORE_KEY;
} else if (afterPhase) {
return LOG_AFTER_KEY;
} else {
return LOG_KEY;
}
}
} // END PreJsf2ExceptionHandler
}