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package com.sun.faces.lifecycle;
import java.util.ListIterator;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.faces.FacesException;
import javax.faces.context.FacesContext;
import javax.faces.context.Flash;
import javax.faces.event.PhaseEvent;
import javax.faces.event.PhaseId;
import javax.faces.event.PhaseListener;
import javax.faces.event.ExceptionQueuedEventContext;
import javax.faces.event.ExceptionQueuedEvent;
import javax.faces.lifecycle.Lifecycle;
import com.sun.faces.util.FacesLogger;
import com.sun.faces.util.Timer;
import com.sun.faces.util.RequestStateManager;
/**
* <p>A <strong>Phase</strong> is a single step in the processing of a
* JavaServer Faces request throughout its entire {@link javax.faces.lifecycle.Lifecycle}.
* Each <code>Phase</code> performs the required transitions on the state
* information in the {@link FacesContext} associated with this request.
*/
public abstract class Phase {
private static final Logger LOGGER = FacesLogger.LIFECYCLE.getLogger();
// ---------------------------------------------------------- Public Methods
/**
* Performs PhaseListener processing and invokes the execute method
* of the Phase.
* @param context the FacesContext for the current request
* @param lifecycle the lifecycle for this request
*/
public void doPhase(FacesContext context,
Lifecycle lifecycle,
ListIterator<PhaseListener> listeners) {
context.setCurrentPhaseId(getId());
PhaseEvent event = null;
if (listeners.hasNext()) {
event = new PhaseEvent(context, this.getId(), lifecycle);
}
// start timing - include before and after phase processing
Timer timer = Timer.getInstance();
if (timer != null) {
timer.startTiming();
}
try {
handleBeforePhase(context, listeners, event);
if (!shouldSkip(context)) {
execute(context);
}
} catch (Throwable e) {
queueException(context, e);
} finally {
try {
handleAfterPhase(context, listeners, event);
} catch (Throwable e) {
queueException(context, e);
}
// stop timing
if (timer != null) {
timer.stopTiming();
timer.logResult(
"Execution time for phase (including any PhaseListeners) -> "
+ this.getId().toString());
}
context.getExceptionHandler().handle();
}
}
/**
* <p>Perform all state transitions required by the current phase of the
* request processing {@link javax.faces.lifecycle.Lifecycle} for a
* particular request. </p>
*
* @param context FacesContext for the current request being processed
* @throws FacesException if a processing error occurred while
* executing this phase
*/
public abstract void execute(FacesContext context) throws FacesException;
/**
* @return the current {@link javax.faces.lifecycle.Lifecycle}
* <strong>Phase</strong> identifier.
*/
public abstract PhaseId getId();
// ------------------------------------------------------- Protected Methods
protected void queueException(FacesContext ctx, Throwable t) {
queueException(ctx, t, null);
}
protected void queueException(FacesContext ctx, Throwable t, String booleanKey) {
ExceptionQueuedEventContext extx = new ExceptionQueuedEventContext(ctx, t);
if (booleanKey != null) {
extx.getAttributes().put(booleanKey, Boolean.TRUE);
}
ctx.getApplication().publishEvent(ctx, ExceptionQueuedEvent.class, extx);
}
/**
* Handle <code>afterPhase</code> <code>PhaseListener</code> events.
* @param context the FacesContext for the current request
* @param listenersIterator a ListIterator for the PhaseListeners that need
* to be invoked
* @param event the event to pass to each of the invoked listeners
*/
protected void handleAfterPhase(FacesContext context,
ListIterator<PhaseListener> listenersIterator,
PhaseEvent event) {
try {
Flash flash = context.getExternalContext().getFlash();
flash.doPostPhaseActions(context);
} catch (UnsupportedOperationException uoe) {
if (LOGGER.isLoggable(Level.FINE)) {
LOGGER.fine("ExternalContext.getFlash() throw UnsupportedOperationException -> Flash unavailable");
}
}
while (listenersIterator.hasPrevious()) {
PhaseListener listener = listenersIterator.previous();
if (this.getId().equals(listener.getPhaseId()) ||
PhaseId.ANY_PHASE.equals(listener.getPhaseId())) {
try {
listener.afterPhase(event);
} catch (Exception e) {
queueException(context,
e,
ExceptionQueuedEventContext.IN_AFTER_PHASE_KEY);
return;
}
}
}
}
/**
* Handle <code>beforePhase</code> <code>PhaseListener</code> events.
* @param context the FacesContext for the current request
* @param listenersIterator a ListIterator for the PhaseListeners that need
* to be invoked
* @param event the event to pass to each of the invoked listeners
*/
protected void handleBeforePhase(FacesContext context,
ListIterator<PhaseListener> listenersIterator,
PhaseEvent event) {
try {
Flash flash = context.getExternalContext().getFlash();
flash.doPrePhaseActions(context);
} catch (UnsupportedOperationException uoe) {
if (LOGGER.isLoggable(Level.FINE)) {
LOGGER.fine("ExternalContext.getFlash() throw UnsupportedOperationException -> Flash unavailable");
}
}
RequestStateManager.clearAttributesForPhase(context,
context.getCurrentPhaseId());
while (listenersIterator.hasNext()) {
PhaseListener listener = listenersIterator.next();
if (this.getId().equals(listener.getPhaseId()) ||
PhaseId.ANY_PHASE.equals(listener.getPhaseId())) {
try {
listener.beforePhase(event);
} catch (Exception e) {
queueException(context,
e,
ExceptionQueuedEventContext.IN_BEFORE_PHASE_KEY);
// move the iterator pointer back one
if (listenersIterator.hasPrevious()) {
listenersIterator.previous();
}
return;
}
}
}
}
// --------------------------------------------------------- Private Methods
/**
* @param context the FacesContext for the current request
* @return <code>true</code> if <code>FacesContext.responseComplete()</code>
* or <code>FacesContext.renderResponse()</code> and the phase is not
* RENDER_RESPONSE, otherwise return <code>false</code>
*/
private boolean shouldSkip(FacesContext context) {
if (context.getResponseComplete()) {
return (true);
} else if (context.getRenderResponse() &&
!PhaseId.RENDER_RESPONSE.equals(this.getId())) {
return (true);
} else {
return (false);
}
}
}