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package com.sun.faces.context;
import java.util.LinkedList;
import java.util.Collections;
import java.util.Iterator;
import java.util.logging.Logger;
import java.util.logging.Level;
import javax.faces.FacesException;
import javax.faces.application.ProjectStage;
import javax.faces.component.UIComponent;
import javax.faces.context.ExceptionHandler;
import javax.faces.context.FacesContext;
import javax.faces.event.AbortProcessingException;
import javax.faces.event.ExceptionQueuedEvent;
import javax.faces.event.SystemEvent;
import javax.faces.event.ExceptionQueuedEventContext;
import javax.faces.event.PhaseId;
import javax.el.ELException;
import com.sun.faces.util.FacesLogger;
import com.sun.faces.renderkit.RenderKitUtils;
import javax.faces.context.ExternalContext;
/**
* <p>
* The default implementation of {@link ExceptionHandler} for JSF 2.0.
* </p>
*
* <p>
* As an implementation note, if changes going forward are required here,
* review the <code>ExceptionHandler</code> implementation within
* <code>javax.faces.webapp.PreJsf2ExceptionHandlerFactory</code>. The code
* is, in most cases, quite similar.
* </p>
*
*/
public class ExceptionHandlerImpl extends ExceptionHandler {
private static final Logger LOGGER = FacesLogger.CONTEXT.getLogger();
private static final String LOG_BEFORE_KEY =
"jsf.context.exception.handler.log_before";
private static final String LOG_AFTER_KEY =
"jsf.context.exception.handler.log_after";
private static final String LOG_KEY =
"jsf.context.exception.handler.log";
private LinkedList<ExceptionQueuedEvent> unhandledExceptions;
private LinkedList<ExceptionQueuedEvent> handledExceptions;
private ExceptionQueuedEvent handled;
private boolean errorPagePresent;
// ------------------------------------------------------------ Constructors
public ExceptionHandlerImpl() {
this.errorPagePresent = true;
}
public ExceptionHandlerImpl(boolean errorPagePresent) {
this.errorPagePresent = errorPagePresent;
}
// ------------------------------------------- Methods from ExceptionHandler
/**
* @see ExceptionHandler@getHandledExceptionQueuedEvent()
*/
public ExceptionQueuedEvent getHandledExceptionQueuedEvent() {
return handled;
}
/**
* @see javax.faces.context.ExceptionHandler#handle()
*/
@SuppressWarnings({"ThrowableInstanceNeverThrown"})
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)) {
handled = event;
Throwable unwrapped = getRootCause(t);
if (unwrapped != null) {
throwIt(context.getContext(),
new FacesException(unwrapped.getMessage(), unwrapped));
} else {
if (t instanceof FacesException) {
throwIt(context.getContext(), (FacesException) t);
} else {
throwIt(context.getContext(),
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());
}
/**
* @see javax.faces.context.ExceptionHandler#getHandledExceptionQueuedEvents()
* @return
*/
public Iterable<ExceptionQueuedEvent> getHandledExceptionQueuedEvents() {
return ((handledExceptions != null)
? handledExceptions
: Collections.<ExceptionQueuedEvent>emptyList());
}
// --------------------------------------------------------- Private Methods
private void throwIt(FacesContext ctx, FacesException fe) {
boolean isDevelopment = ctx.isProjectStage(ProjectStage.Development);
ExternalContext extContext = ctx.getExternalContext();
Throwable wrapped = fe.getCause();
try {
extContext.responseReset();
} catch (Exception e) {
if (LOGGER.isLoggable(Level.INFO)) {
LOGGER.log(Level.INFO, "Exception when handling error trying to reset the response.", wrapped);
}
}
if (null != wrapped && wrapped instanceof FacesFileNotFoundException) {
extContext.setResponseStatus(404);
} else {
extContext.setResponseStatus(500);
}
if (isDevelopment && !errorPagePresent) {
// RELEASE_PENDING_2_1
// thThe error page here will be text/html which means not all device
// types are going to render this properly. This should be addressed
// in 2.1
RenderKitUtils.renderHtmlErrorPage(ctx, fe);
} else {
if (isDevelopment) {
// store the view root where the exception occurred into the
// request scope so that the error page can display that component
// tree and not the one rendering the errorpage
ctx.getExternalContext().getRequestMap().put("com.sun.faces.error.view", ctx.getViewRoot());
}
throw fe;
}
}
/**
* @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) {
return (!(t instanceof AbortProcessingException));
}
private void log(ExceptionQueuedEventContext exceptionContext) {
UIComponent c = exceptionContext.getComponent();
boolean beforePhase = exceptionContext.inBeforePhase();
boolean afterPhase = exceptionContext.inAfterPhase();
PhaseId phaseId = exceptionContext.getPhaseId();
Throwable t = exceptionContext.getException();
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;
}
}
}