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/*
* Copyright (c) 1997, 2020 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package jakarta.faces.context;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import com.sun.faces.config.InitFacesContext;
import jakarta.el.ELContext;
import jakarta.faces.FactoryFinder;
import jakarta.faces.application.Application;
import jakarta.faces.application.FacesMessage;
import jakarta.faces.application.FacesMessage.Severity;
import jakarta.faces.application.ProjectStage;
import jakarta.faces.component.UINamingContainer;
import jakarta.faces.component.UIViewRoot;
import jakarta.faces.event.PhaseId;
import jakarta.faces.lifecycle.Lifecycle;
import jakarta.faces.render.RenderKit;
/**
*
* FacesContext contains all of
* the per-request state information related to the processing of a single Jakarta Faces request, and the
* rendering of the corresponding response. It is passed to, and potentially modified by, each phase of the request
* processing lifecycle.
*
*
*
* A {@link FacesContext} instance is associated with a particular request at the beginning of request processing, by a
* call to the getFacesContext() method of the {@link FacesContextFactory} instance associated with the
* current web application. The instance remains active until its release() method is called, after which
* no further references to this instance are allowed. While a {@link FacesContext} instance is active, it must not be
* referenced from any thread other than the one upon which the Jakarta Servlet container executing this web application
* utilizes for the processing of this request.
*
*
*
* A FacesContext can be injected into a request scoped bean using @Inject FacesContext facesContext;
*
*/
public abstract class FacesContext {
private FacesContext defaultFacesContext;
private boolean processingEvents = true;
private boolean isCreatedFromValidFactory = true;
private static final ConcurrentHashMap threadInitContext = new ConcurrentHashMap<>(2);
private static final ConcurrentHashMap initContextServletContext = new ConcurrentHashMap<>(2);
/**
* Default constructor.
*
* This looks at the callstack to see if we're created from a factory.
*
*/
public FacesContext() {
Thread curThread = Thread.currentThread();
StackTraceElement[] callstack = curThread.getStackTrace();
String declaringClassName = callstack[3].getClassName();
try {
ClassLoader curLoader = curThread.getContextClassLoader();
Class declaringClass = curLoader.loadClass(declaringClassName);
if (!FacesContextFactory.class.isAssignableFrom(declaringClass)) {
isCreatedFromValidFactory = false;
}
} catch (ClassNotFoundException ignored) {
}
}
// -------------------------------------------------------------- Properties
/**
*
* Return the {@link Application} instance associated with this web
* application.
*
*
*
* It is valid to call this method during application startup or shutdown. If called during application startup or
* shutdown, returns the correct current {@link jakarta.faces.application.Application} instance.
*
*
* @return the Application instance associated with this web application.
*
* @throws IllegalStateException if this method is called after this instance has been released
*/
public abstract Application getApplication();
/**
*
* Return a mutable Map representing the attributes associated wth this FacesContext instance.
* This Map is useful to store attributes that you want to go out of scope when the Faces lifecycle for the
* current request ends, which is not always the same as the request ending, especially in the case of Jakarta Servlet
* filters that are invoked after the Faces lifecycle for this request completes. Accessing this
* Map does not cause any events to fire, as is the case with the other maps: for request, session, and
* application scope. When {@link #release()} is invoked, the attributes must be cleared.
*
*
*
*
*
* The Map returned by this method is not associated with the request. If you would like to get or set
* request attributes, see {@link ExternalContext#getRequestMap}.
*
*
* The default implementation throws UnsupportedOperationException and is provided for the sole purpose of
* not breaking existing applications that extend this class.
*
*
*
*
* @return mutable Map representing the attributes associated wth this FacesContext instance.
*
* @throws IllegalStateException if this method is called after this instance has been released
*
* @since 2.0
*/
public Map getAttributes() {
if (defaultFacesContext != null) {
return defaultFacesContext.getAttributes();
}
if (!isCreatedFromValidFactory) {
if (attributesForInvalidFactoryConstruction == null) {
attributesForInvalidFactoryConstruction = new HashMap<>();
}
return attributesForInvalidFactoryConstruction;
}
throw new UnsupportedOperationException();
}
private Map attributesForInvalidFactoryConstruction;
/**
*
* Return the {@link PartialViewContext} for this request. The {@link PartialViewContext} is used to control the
* processing of specified components during the execute portion of the request processing lifecycle (known as partial
* processing) and the rendering of specified components (known as partial rendering). This method must return a new
* {@link PartialViewContext} if one does not already exist.
*
*
* @return the instance of PartialViewContext for this request.
*
* @throws IllegalStateException if this method is called after this instance has been released
*
* @since 2.0
*/
public PartialViewContext getPartialViewContext() {
if (defaultFacesContext != null) {
return defaultFacesContext.getPartialViewContext();
}
if (!isCreatedFromValidFactory) {
if (partialViewContextForInvalidFactoryConstruction == null) {
PartialViewContextFactory f = (PartialViewContextFactory) FactoryFinder.getFactory(FactoryFinder.PARTIAL_VIEW_CONTEXT_FACTORY);
partialViewContextForInvalidFactoryConstruction = f.getPartialViewContext(FacesContext.getCurrentInstance());
}
return partialViewContextForInvalidFactoryConstruction;
}
throw new UnsupportedOperationException();
}
private PartialViewContext partialViewContextForInvalidFactoryConstruction;
/**
*
* Return an Iterator over the client identifiers for which at least one
* {@link jakarta.faces.application.FacesMessage} has been queued. If there are no such client identifiers, an empty
* Iterator is returned. If any messages have been queued that were not associated with any specific client
* identifier, a null value will be included in the iterated values. The elements in the
* Iterator must be returned in the order in which they were added with {@link #addMessage}.
*
*
* @return the Iterator over the client identifiers for which at least one
* {@link jakarta.faces.application.FacesMessage} has been queued.
*
* @throws IllegalStateException if this method is called after this instance has been released
*/
public abstract Iterator getClientIdsWithMessages();
/**
*
* Return the ELContext instance for this FacesContext instance. This ELContext
* instance has the same lifetime and scope as the FacesContext instance with which it is associated, and
* may be created lazily the first time this method is called for a given FacesContext instance. Upon
* creation of the ELContext instance, the implementation must take the following action:
*
*
*
*
* -
*
* Call the {@link ELContext#putContext} method on the instance, passing in FacesContext.class and the
* this reference for the FacesContext instance itself.
*
*
*
* -
*
* If the Collection returned by {@link jakarta.faces.application.Application#getELContextListeners} is
* non-empty, create an instance of {@link jakarta.el.ELContextEvent} and pass it to each
* {@link jakarta.el.ELContextListener} instance in the Collection by calling the
* {@link jakarta.el.ELContextListener#contextCreated} method.
*
*
*
*
*
* @return instance of ELContext.
*
* @throws IllegalStateException if this method is called after this instance has been released
*
* @since 1.2
*/
public ELContext getELContext() {
if (defaultFacesContext != null) {
return defaultFacesContext.getELContext();
}
throw new UnsupportedOperationException();
}
/**
*
* Return the {@link ExceptionHandler} for this request.
*
*
* @return instance of ExceptionHandler.
*/
public ExceptionHandler getExceptionHandler() {
if (defaultFacesContext != null) {
return defaultFacesContext.getExceptionHandler();
}
throw new UnsupportedOperationException();
}
/**
*
* Set the {@link ExceptionHandler} for this request.
*
*
* @param exceptionHandler the ExceptionHandler for this request.
*/
public void setExceptionHandler(ExceptionHandler exceptionHandler) {
if (defaultFacesContext != null) {
defaultFacesContext.setExceptionHandler(exceptionHandler);
} else {
throw new UnsupportedOperationException();
}
}
/**
*
* Return the {@link Lifecycle} instance for this
* FacesContext instance.
*
*
* @return instance of Lifecycle
*
* @throws IllegalStateException if this method is called after this instance has been released
*
* @since 4.0
*/
public abstract Lifecycle getLifecycle();
/**
*
* Return the {@link ExternalContext} instance for this
* FacesContext instance.
*
*
*
* It is valid to call this method during application startup or shutdown. If called during application startup or
* shutdown, this method returns an {@link ExternalContext} instance with the special behaviors indicated in the javadoc
* for that class. Methods document as being valid to call during application startup or shutdown must be supported.
*
*
* @return instance of ExternalContext
*
* @throws IllegalStateException if this method is called after this instance has been released
*/
public abstract ExternalContext getExternalContext();
/**
*
* Return the maximum severity level recorded on any {@link jakarta.faces.application.FacesMessage}s that has been
* queued, whether or not they are associated with any specific {@link jakarta.faces.component.UIComponent}. If no such
* messages have been queued, return null.
*
*
* @return the maximum severity level.
*
* @throws IllegalStateException if this method is called after this instance has been released
*/
public abstract Severity getMaximumSeverity();
/**
*
* Return an Iterator over the {@link jakarta.faces.application.FacesMessage}s that have been queued,
* whether or not they are associated with any specific client identifier. If no such messages have been queued, return
* an empty Iterator. The elements of the Iterator must be returned in the order in which they
* were added with calls to {@link #addMessage}.
*
*
* @return Iterator over the FacesMessages that have been queued.
*
* @throws IllegalStateException if this method is called after this instance has been released
*/
public abstract Iterator getMessages();
/**
*
* Like {@link #getMessages}, but returns a List<FacesMessage>, enabling use from Jakarta Expression
* Language expressions.
*
*
*
* The default implementation throws UnsupportedOperationException and is provided for the sole purpose of
* not breaking existing applications that extend this class.
*
*
* @return an immutable List which is effectively a snapshot of the messages present at the time of
* invocation.
*
* @throws IllegalStateException if this method is called after this instance has been released
*
* @since 2.0
*/
public List getMessageList() {
if (defaultFacesContext != null) {
return defaultFacesContext.getMessageList();
}
throw new UnsupportedOperationException();
}
/**
*
* Like {@link #getMessages(java.lang.String)}, but returns a List<FacesMessage> of messages for the
* component with client id matching argument clientId.
*
*
*
* The default implementation throws UnsupportedOperationException and is provided for the sole purpose of
* not breaking existing applications that extend this class.
*
*
* @param clientId the client id of a component.
*
* @return an immutable List which is effectively a snapshot of the messages present at the time of
* invocation.
*
* @throws IllegalStateException if this method is called after this instance has been released
*
* @since 2.0
*/
public List getMessageList(String clientId) {
if (defaultFacesContext != null) {
return defaultFacesContext.getMessageList(clientId);
}
throw new UnsupportedOperationException();
}
/**
*
* Return an Iterator over the {@link jakarta.faces.application.FacesMessage}s that have been queued that
* are associated with the specified client identifier (if clientId is not null), or over the
* {@link jakarta.faces.application.FacesMessage}s that have been queued that are not associated with any specific
* client identifier (if clientId is null). If no such messages have been queued, return an
* empty Iterator. The elements of the Iterator must be returned in the order in which they
* were added with calls to {@link #addMessage}.
*
*
* @param clientId The client identifier for which messages are requested, or null for messages not
* associated with any client identifier
*
* @return Iterator over the FacesMessages.
*
* @throws IllegalStateException if this method is called after this instance has been released
*/
public abstract Iterator getMessages(String clientId);
/**
*
* Return the result of calling {@link UINamingContainer#getSeparatorChar}, passing this as the argument.
* Note that this enables accessing the value of this property from the Jakarta Expression Language expression
* #{facesContext.namingContainerSeparatorChar}.
*
*
* @return the separator char.
*
*/
public char getNamingContainerSeparatorChar() {
return UINamingContainer.getSeparatorChar(this);
}
/**
*
* Return the {@link RenderKit} instance for the render kit identifier specified on our {@link UIViewRoot}, if there is
* one. If there is no current {@link UIViewRoot}, if the {@link UIViewRoot} does not have a specified
* renderKitId, or if there is no {@link RenderKit} for the specified identifier, return null
* instead.
*
*
* @return instance of RenderKit associated with the UIViewRoot.
*
* @throws IllegalStateException if this method is called after this instance has been released
*/
public abstract RenderKit getRenderKit();
/**
*
* Return true if the renderResponse() method has been called for the current request.
*
*
* @return flag indicating whether the renderResponse() has been called.
*
* @throws IllegalStateException if this method is called after this instance has been released
*/
public abstract boolean getRenderResponse();
/**
*
* Return true if the responseComplete() method has been called for the current request.
*
*
* @return the boolean indicating whether responseComplete() method has been called.
*
* @throws IllegalStateException if this method is called after this instance has been released
*/
public abstract boolean getResponseComplete();
/**
*
* Return the list of resource library contracts that have been calculated to be appropriate for use with this view, or
* an empty list if there are no such resource library contracts. The list returned by this method must be immutable.
* For backward compatibility with implementations of the specification prior to when this method was introduced, an
* implementation is provided that returns an empty list. Implementations compliant with the version in which this
* method was introduced must implement this method as specified.
*
*
* @return the list of resource library contracts.
*
* @throws IllegalStateException if this method is called after this instance has been released
*
* @since 2.2
*/
public List getResourceLibraryContracts() {
return Collections.emptyList();
}
/**
*
* Set the resource library contracts calculated as valid to use with this view. The implementation must copy the
* contents of the incoming {@code List} into an immutable {@code List} for return from
* {@link #getResourceLibraryContracts}. If the argument is {@code null} or empty, the action taken is the same as if
* the argument is {@code null}: a subsequent call to {@code getResourceLibraryContracts} returns {@code null}. This
* method may only be called during the processing of {@link jakarta.faces.view.ViewDeclarationLanguage#createView} and
* during the VDL tag handler for the tag corresponding to an instance of {@code UIViewRoot}. For backward compatibility
* with implementations of the specification prior to when this method was introduced, an implementation is provided
* that takes no action. Implementations compliant with the version in which this method was introduced must implement
* this method as specified.
*
*
*
* @param contracts The new contracts to be returned, as an immutable {@code List}. from a subsequent call to
* {@link #getResourceLibraryContracts}.
*
* @throws IllegalStateException if this method is called after this instance has been released
*
* @since 2.2
*
*/
public void setResourceLibraryContracts(List contracts) {
}
/**
*
* Return true if the validationFailed() method has been called for the current request.
*
*
* @return boolean indicating if the validationFailed() method has been called for the current request
*
* @throws IllegalStateException if this method is called after this instance has been released
*/
public boolean isValidationFailed() {
if (defaultFacesContext != null) {
return defaultFacesContext.isValidationFailed();
}
throw new UnsupportedOperationException();
}
/**
*
* Return the {@link ResponseStream} to which components should direct their binary output. Within a given response,
* components can use either the ResponseStream or the ResponseWriter, but not both.
*
* @return ResponseStream instance.
*
* @throws IllegalStateException if this method is called after this instance has been released
*/
public abstract ResponseStream getResponseStream();
/**
*
* Set the {@link ResponseStream} to which components should direct their binary output.
*
* @param responseStream The new ResponseStream for this response
*
* @throws NullPointerException if responseStream is null
*
* @throws IllegalStateException if this method is called after this instance has been released
*/
public abstract void setResponseStream(ResponseStream responseStream);
/**
*
* Return the {@link ResponseWriter} to which components should direct their character-based output. Within a given
* response, components can use either the ResponseStream or the ResponseWriter, but not both.
*
*
* @return ResponseWriter instance.
*
* @throws IllegalStateException if this method is called after this instance has been released
*/
public abstract ResponseWriter getResponseWriter();
/**
*
* Set the {@link ResponseWriter} to which components should direct their character-based output.
*
* @param responseWriter The new ResponseWriter for this response
*
* @throws IllegalStateException if this method is called after this instance has been released
* @throws NullPointerException if responseWriter is null
*/
public abstract void setResponseWriter(ResponseWriter responseWriter);
/**
*
* Return the root component that is associated with the this request.
*
*
*
* It is valid to call this method during application startup or shutdown. If called during application startup or
* shutdown, this method returns a new UIViewRoot with its locale set to Locale.getDefault().
*
*
* @return UIViewRoot instance.
*
* @throws IllegalStateException if this method is called after this instance has been released
*/
public abstract UIViewRoot getViewRoot();
/**
*
* Set the root component that is associated with this
* request.
*
*
* This method can be called by the application handler (or a class that the handler calls), during the Invoke
* Application phase of the request processing lifecycle and during the Restore View phase of the request
* processing lifecycle (especially when a new root component is created). In the present version of the specification,
* implementations are not required to enforce this restriction, though a future version of the specification may
* require enforcement.
*
*
*
* If the current UIViewRoot is non-null, and calling equals() on the argument
* root, passing the current UIViewRoot returns false, the clear
* method must be called on the Map returned from {@link UIViewRoot#getViewMap}.
*
*
* @param root The new component {@link UIViewRoot} component
*
* @throws IllegalStateException if this method is called after this instance has been released
* @throws NullPointerException if root is null
*/
public abstract void setViewRoot(UIViewRoot root);
// ---------------------------------------------------------- Public Methods
/**
*
* Append a {@link jakarta.faces.application.FacesMessage} to the set of messages associated with the specified client
* identifier, if clientId is not null. If clientId is null, this
* {@link jakarta.faces.application.FacesMessage} is assumed to not be associated with any specific component instance.
*
*
* @param clientId The client identifier with which this message is associated (if any)
* @param message The message to be appended
*
* @throws IllegalStateException if this method is called after this instance has been released
* @throws NullPointerException if message is null
*/
public abstract void addMessage(String clientId, FacesMessage message);
/**
*
* Return a flag indicating if the resources associated with this FacesContext instance have been released.
*
*
* @return true if the resources have been released.
*
* @since 2.1
*/
public boolean isReleased() {
if (defaultFacesContext != null) {
return defaultFacesContext.isReleased();
}
throw new UnsupportedOperationException();
}
/**
*
* Release any resources associated with this FacesContext
* instance. Faces implementations may choose to pool instances in the associated {@link FacesContextFactory} to avoid
* repeated object creation and garbage collection. After release() is called on a
* FacesContext instance (until the FacesContext instance has been recycled by the
* implementation for re-use), calling any other methods will cause an IllegalStateException to be thrown.
*
*
*
* If a call was made to {@link #getAttributes} during the processing for this request, the implementation must call
* clear() on the Map returned from getAttributes(), and then de-allocate the
* data-structure behind that Map.
*
*
*
* The implementation must call {@link #setCurrentInstance} passing null to remove the association between
* this thread and this dead FacesContext instance.
*
*
* @throws IllegalStateException if this method is called after this instance has been released
*/
public abstract void release();
/**
*
* Signal the Jakarta Faces implementation that, as soon as the current phase of the request processing lifecycle
* has been completed, control should be passed to the Render Response phase, bypassing any phases that have
* not been executed yet.
*
*
* @throws IllegalStateException if this method is called after this instance has been released
*/
public abstract void renderResponse();
/**
*
* This utility method simply returns the result of
* {@link jakarta.faces.render.ResponseStateManager#isPostback(FacesContext)}.
*
*
*
* The default implementation throws UnsupportedOperationException and is provided for the sole purpose of
* not breaking existing applications that extend this class.
*
*
* @return the boolean indicating whether this request is a post one.
*
* @throws IllegalStateException if this method is called after this instance has been released
*
* @since 2.0
*/
public boolean isPostback() {
if (defaultFacesContext != null) {
return defaultFacesContext.isPostback();
}
throw new UnsupportedOperationException();
}
/**
*
* Signal the Jakarta Faces implementation that the HTTP response for this request has already been generated
* (such as an HTTP redirect), and that the request processing lifecycle should be terminated as soon as the current
* phase is completed.
*
*
* @throws IllegalStateException if this method is called after this instance has been released
*/
public abstract void responseComplete();
/**
*
* Sets a flag which indicates that a conversion or validation error occurred while processing the inputs. Inputs
* consist of either page parameters or form bindings. This flag can be read using {@link #isValidationFailed}.
*
*
* @throws IllegalStateException if this method is called after this instance has been released
*/
public void validationFailed() {
if (defaultFacesContext != null) {
defaultFacesContext.validationFailed();
} else {
throw new UnsupportedOperationException();
}
}
/**
*
* Return the value last set on this FacesContext instance when {@link #setCurrentPhaseId} was called.
*
*
* @return the current phase id.
*
* @throws IllegalStateException if this method is called after this instance has been released
*
* @since 2.0
*/
public PhaseId getCurrentPhaseId() {
if (defaultFacesContext != null) {
return defaultFacesContext.getCurrentPhaseId();
}
if (!isCreatedFromValidFactory) {
return currentPhaseIdForInvalidFactoryConstruction;
}
throw new UnsupportedOperationException();
}
/**
*
* The implementation must call this method at the earliest possble point in time after entering into a new phase in the
* request processing lifecycle.
*
*
* @param currentPhaseId The {@link jakarta.faces.event.PhaseId} for the current phase.
*
* @throws IllegalStateException if this method is called after this instance has been released
*
* @since 2.0
*/
public void setCurrentPhaseId(PhaseId currentPhaseId) {
if (defaultFacesContext != null) {
defaultFacesContext.setCurrentPhaseId(currentPhaseId);
} else if (!isCreatedFromValidFactory) {
currentPhaseIdForInvalidFactoryConstruction = currentPhaseId;
} else {
throw new UnsupportedOperationException();
}
}
private PhaseId currentPhaseIdForInvalidFactoryConstruction;
/**
*
* Allows control of wheter or not the runtime will publish events when
* {@link Application#publishEvent(FacesContext, Class, Object)} or
* {@link Application#publishEvent(FacesContext, Class, Class, Object)} is called.
*
*
* @param processingEvents flag indicating events should be processed or not
*/
public void setProcessingEvents(boolean processingEvents) {
this.processingEvents = processingEvents;
}
/**
*
* Returns a flag indicating whether or not the runtime should publish events when asked to do so.
*
*
* @return true if events should be published, otherwise false
*/
public boolean isProcessingEvents() {
return processingEvents;
}
/**
*
* Return true if the current {@link ProjectStage} as returned by the {@link Application} instance is equal
* to stage, otherwise return false
*
*
* @param stage the {@link ProjectStage} to check
*
* @return boolean indicating whether the application has the same stage.
*
* @throws IllegalStateException if this method is called after this instance has been released
* @throws NullPointerException if stage is null
*/
public boolean isProjectStage(ProjectStage stage) {
if (stage == null) {
throw new NullPointerException();
}
return stage.equals(getApplication().getProjectStage());
}
// ---------------------------------------------------------- Static Methods
/**
*
* The ThreadLocal variable used to record the {@link FacesContext} instance for each processing thread.
*
*/
private static final ThreadLocal instance = ThreadLocal.withInitial(() -> null);
/**
*
* Return the {@link FacesContext} instance for the request that is being processed by the current thread. If called
* during application initialization or shutdown, any method documented as "valid to call this method during application
* startup or shutdown" must be supported during application startup or shutdown time. The result of calling a method
* during application startup or shutdown time that does not have this designation is undefined.
*
*
* @return the instance of FacesContext.
*/
public static FacesContext getCurrentInstance() {
FacesContext facesContext = instance.get();
if (null == facesContext) {
facesContext = threadInitContext.get(Thread.currentThread());
}
// Bug 20458755: If not found in the threadInitContext, use
// a special FacesContextFactory implementation that knows how to
// use the initContextServletContext map to obtain current ServletContext
// out of thin air (actually, using the current ClassLoader), and use it
// to obtain the init FacesContext corresponding to that ServletContext.
if (null == facesContext) {
// In the non-init case, this will immediately return null.
// In the init case, this will return null if Jakarta Faces hasn't been
// initialized in the ServletContext corresponding to this
// Thread's context ClassLoader.
ClassLoader cl = Thread.currentThread().getContextClassLoader();
if (cl == null) {
return null;
}
FacesContextFactory privateFacesContextFactory = (FacesContextFactory) FactoryFinder.getFactory("com.sun.faces.ServletContextFacesContextFactory");
if (null != privateFacesContextFactory) {
facesContext = privateFacesContextFactory.getFacesContext(null, null, null, null);
}
}
return facesContext;
}
/**
*
* Set the {@link FacesContext} instance for the request that is being processed by the current thread.
*
*
* @param context The {@link FacesContext} instance for the current thread, or null if this thread no
* longer has a FacesContext instance.
*
*/
protected static void setCurrentInstance(FacesContext context) {
if (context == null) {
instance.remove();
} else {
instance.set(context);
}
}
}