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The private implementation classes of the Apache MyFaces Core JSF-2.0 Implementation
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.myfaces.lifecycle;
import java.util.Collection;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.el.MethodExpression;
import javax.faces.FacesException;
import javax.faces.FactoryFinder;
import javax.faces.application.Application;
import javax.faces.application.ProjectStage;
import javax.faces.application.ViewExpiredException;
import javax.faces.application.ViewHandler;
import javax.faces.component.UIViewParameter;
import javax.faces.component.UIViewRoot;
import javax.faces.context.FacesContext;
import javax.faces.event.PhaseEvent;
import javax.faces.event.PhaseId;
import javax.faces.event.PostAddToViewEvent;
import javax.faces.lifecycle.Lifecycle;
import javax.faces.lifecycle.LifecycleFactory;
import javax.faces.view.ViewDeclarationLanguage;
import javax.faces.view.ViewMetadata;
import javax.faces.webapp.FacesServlet;
import org.apache.myfaces.renderkit.ErrorPageWriter;
/**
* Implements the Restore View Phase (JSF Spec 2.2.1)
*
* @author Nikolay Petrov (latest modification by $Author: jakobk $)
* @author Bruno Aranda (JSF 1.2)
* @version $Revision: 963832 $ $Date: 2010-07-13 14:40:18 -0500 (Tue, 13 Jul 2010) $
*/
class RestoreViewExecutor extends PhaseExecutor
{
//private static final Log log = LogFactory.getLog(RestoreViewExecutor.class);
private static final Logger log = Logger.getLogger(RestoreViewExecutor.class.getName());
private RestoreViewSupport _restoreViewSupport;
@Override
public void doPrePhaseActions(FacesContext facesContext)
{
// Call initView() on the ViewHandler.
// This will set the character encoding properly for this request.
// Note that we are doing this here, because we need the character encoding
// to be set as early as possible (before any PhaseListener is executed).
facesContext.getApplication().getViewHandler().initView(facesContext);
}
public boolean execute(FacesContext facesContext)
{
if (facesContext == null)
{
throw new FacesException("FacesContext is null");
}
// get some required Objects
Application application = facesContext.getApplication();
ViewHandler viewHandler = application.getViewHandler();
UIViewRoot viewRoot = facesContext.getViewRoot();
RestoreViewSupport restoreViewSupport = getRestoreViewSupport();
// Examine the FacesContext instance for the current request. If it already contains a UIViewRoot
if (viewRoot != null)
{
if (log.isLoggable(Level.FINEST))
log.finest("View already exists in the FacesContext");
// Set the locale on this UIViewRoot to the value returned by the getRequestLocale() method on the
// ExternalContext for this request
viewRoot.setLocale(facesContext.getExternalContext().getRequestLocale());
restoreViewSupport.processComponentBinding(facesContext, viewRoot);
// invoke the afterPhase MethodExpression of UIViewRoot
_invokeViewRootAfterPhaseListener(facesContext);
return false;
}
String viewId = restoreViewSupport.calculateViewId(facesContext);
// Determine if the current request is an attempt by the
// servlet container to display an error page.
// If the request is an error page request, the servlet container
// is required to set the request parameter "javax.servlet.error.message".
final boolean errorPageRequest = facesContext.getExternalContext().getRequestMap()
.get("javax.servlet.error.message") != null;
// Determine if this request is a postback or an initial request.
// But if it is an error page request, do not treat it as a postback (since 2.0)
if (!errorPageRequest && restoreViewSupport.isPostback(facesContext))
{ // If the request is a postback
if (log.isLoggable(Level.FINEST))
log.finest("Request is a postback");
try
{
facesContext.setProcessingEvents(false);
// call ViewHandler.restoreView(), passing the FacesContext instance for the current request and the
// view identifier, and returning a UIViewRoot for the restored view.
viewRoot = viewHandler.restoreView(facesContext, viewId);
if (viewRoot == null)
{
// If the return from ViewHandler.restoreView() is null, throw a ViewExpiredException with an
// appropriate error message.
throw new ViewExpiredException("No saved view state could be found for the view identifier: " + viewId,
viewId);
}
// Store the restored UIViewRoot in the FacesContext.
facesContext.setViewRoot(viewRoot);
}
finally
{
facesContext.setProcessingEvents(true);
}
// Restore binding
// See https://javaserverfaces-spec-public.dev.java.net/issues/show_bug.cgi?id=806
restoreViewSupport.processComponentBinding(facesContext, viewRoot);
}
else
{ // If the request is a non-postback
if (log.isLoggable(Level.FINEST))
log.finest("Request is not a postback. New UIViewRoot will be created");
//viewHandler.deriveViewId(facesContext, viewId)
ViewDeclarationLanguage vdl = viewHandler.getViewDeclarationLanguage(facesContext,
restoreViewSupport.deriveViewId(facesContext, viewId));
if (vdl != null)
{
ViewMetadata metadata = vdl.getViewMetadata(facesContext, viewId);
Collection viewParameters = null;
if (metadata != null)
{
viewRoot = metadata.createMetadataView(facesContext);
if (viewRoot != null)
{
viewParameters = ViewMetadata.getViewParameters(viewRoot);
}
else if(facesContext.getResponseComplete())
{
// this can happen if the current request is a debug request,
// in this case no further processing is necessary
return true;
}
}
// If viewParameters is not an empty collection DO NOT call renderResponse
if ( !(viewParameters != null && !viewParameters.isEmpty()) )
{
// Call renderResponse() on the FacesContext.
facesContext.renderResponse();
}
}
else
{
// Call renderResponse
facesContext.renderResponse();
}
// viewRoot can be null here, if ...
// - we don't have a ViewDeclarationLanguage (e.g. when using facelets-1.x)
// - there is no view metadata or metadata.createMetadataView() returned null
if (viewRoot == null)
{
// call ViewHandler.createView(), passing the FacesContext instance for the current request and
// the view identifier
viewRoot = viewHandler.createView(facesContext, viewId);
}
// Subscribe the newly created UIViewRoot instance to the AfterAddToParent event, passing the
// UIViewRoot instance itself as the listener.
// -= Leonardo Uribe =- This line it is not necessary because it was
// removed from jsf 2.0 section 2.2.1 when pass from EDR2 to Public Review
// viewRoot.subscribeToEvent(PostAddToViewEvent.class, viewRoot);
// Store the new UIViewRoot instance in the FacesContext.
facesContext.setViewRoot(viewRoot);
// Publish an AfterAddToParent event with the created UIViewRoot as the event source.
application.publishEvent(facesContext, PostAddToViewEvent.class, viewRoot);
}
// add the ErrorPageBean to the view map to fully support
// facelet error pages, if we are in ProjectStage Development
// and currently generating an error page
if (errorPageRequest && facesContext.isProjectStage(ProjectStage.Development))
{
facesContext.getViewRoot().getViewMap()
.put(ErrorPageWriter.ERROR_PAGE_BEAN_KEY, new ErrorPageWriter.ErrorPageBean());
}
// invoke the afterPhase MethodExpression of UIViewRoot
_invokeViewRootAfterPhaseListener(facesContext);
return false;
}
/**
* Invoke afterPhase MethodExpression of UIViewRoot.
* Note: In this phase it is not possible to invoke the beforePhase method, because we
* first have to restore the view to get its attributes. Also it is not really possible
* to call the afterPhase method inside of UIViewRoot for this phase, thus it was decided
* in the JSF 2.0 spec rev A to put this here.
* @param facesContext
*/
private void _invokeViewRootAfterPhaseListener(FacesContext facesContext)
{
// get the UIViewRoot (note that it must not be null at this point)
UIViewRoot root = facesContext.getViewRoot();
MethodExpression afterPhaseExpression = root.getAfterPhaseListener();
if (afterPhaseExpression != null)
{
PhaseEvent event = new PhaseEvent(facesContext, getPhase(), _getLifecycle(facesContext));
try
{
afterPhaseExpression.invoke(facesContext.getELContext(), new Object[] { event });
}
catch (Throwable t)
{
log.log(Level.SEVERE, "An Exception occured while processing " +
afterPhaseExpression.getExpressionString() +
" in Phase " + getPhase(), t);
}
}
}
/**
* Gets the current Lifecycle instance from the LifecycleFactory
* @param facesContext
* @return
*/
private Lifecycle _getLifecycle(FacesContext facesContext)
{
LifecycleFactory factory = (LifecycleFactory) FactoryFinder.getFactory(FactoryFinder.LIFECYCLE_FACTORY);
String id = facesContext.getExternalContext().getInitParameter(FacesServlet.LIFECYCLE_ID_ATTR);
if (id == null)
{
id = LifecycleFactory.DEFAULT_LIFECYCLE;
}
return factory.getLifecycle(id);
}
protected RestoreViewSupport getRestoreViewSupport()
{
if (_restoreViewSupport == null)
{
_restoreViewSupport = new DefaultRestoreViewSupport();
}
return _restoreViewSupport;
}
/**
* @param restoreViewSupport
* the restoreViewSupport to set
*/
public void setRestoreViewSupport(RestoreViewSupport restoreViewSupport)
{
_restoreViewSupport = restoreViewSupport;
}
public PhaseId getPhase()
{
return PhaseId.RESTORE_VIEW;
}
}