javax.faces.context

Class FacesContext

java.lang.Object

javax.faces.context.FacesContext

Direct Known Subclasses:

FacesContextWrapper

public abstract class FacesContext
extends Object

FacesContext contains all of the per-request state information related to the processing of a single JavaServer 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 FacesContext instance is associated with a particular request at the beginning of request processing, by a call to the getFacesContext() method of the 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 FacesContext instance is active, it must not be referenced from any thread other than the one upon which the servlet container executing this web application utilizes for the processing of this request.

Constructor Summary

Constructors

Constructor and Description
FacesContext()

Method Summary

Methods

Modifier and Type	Method and Description
abstract void	addMessage(String clientId, FacesMessage message) Append a FacesMessage to the set of messages associated with the specified client identifier, if clientId is not null.
abstract Application	getApplication() Return the Application instance associated with this web application.
Map<Object,Object>	getAttributes() Return a mutable Map representing the attributes associated wth this FacesContext instance.
abstract Iterator<String>	getClientIdsWithMessages() Return an Iterator over the client identifiers for which at least one FacesMessage has been queued.
static FacesContext	getCurrentInstance() Return the FacesContext instance for the request that is being processed by the current thread.
PhaseId	getCurrentPhaseId() Return the value last set on this FacesContext instance when setCurrentPhaseId(javax.faces.event.PhaseId) was called.
ELContext	getELContext() Return the ELContext instance for this FacesContext instance.
ExceptionHandler	getExceptionHandler() Return the ExceptionHandler for this request.
abstract ExternalContext	getExternalContext() Return the ExternalContext instance for this FacesContext instance.
abstract FacesMessage.Severity	getMaximumSeverity() Return the maximum severity level recorded on any FacesMessages that has been queued, whether or not they are associated with any specific UIComponent.
List<FacesMessage>	getMessageList() Like getMessages(), but returns a List<FacesMessage>, enabling use from EL expressions.
List<FacesMessage>	getMessageList(String clientId) Like getMessages(java.lang.String), but returns a List<FacesMessage> of messages for the component with client id matching argument clientId.
abstract Iterator<FacesMessage>	getMessages() Return an Iterator over the FacesMessages that have been queued, whether or not they are associated with any specific client identifier.
abstract Iterator<FacesMessage>	getMessages(String clientId) Return an Iterator over the FacesMessages that have been queued that are associated with the specified client identifier (if clientId is not null), or over the FacesMessages that have been queued that are not associated with any specific client identifier (if clientId is null).
PartialViewContext	getPartialViewContext() Return the PartialViewContext for this request.
abstract RenderKit	getRenderKit() Return the RenderKit instance for the render kit identifier specified on our UIViewRoot, if there is one.
abstract boolean	getRenderResponse() Return true if the renderResponse() method has been called for the current request.
abstract boolean	getResponseComplete() Return true if the responseComplete() method has been called for the current request.
abstract ResponseStream	getResponseStream() Return the ResponseStream to which components should direct their binary output.
abstract ResponseWriter	getResponseWriter() Return the ResponseWriter to which components should direct their character-based output.
abstract UIViewRoot	getViewRoot() Return the root component that is associated with the this request.
boolean	isPostback() This utility method simply returns the result of ResponseStateManager.isPostback(FacesContext).
boolean	isProcessingEvents() Returns a flag indicating whether or not the runtime should publish events when asked to do so.
boolean	isProjectStage(ProjectStage stage) Return true if the current ProjectStage as returned by the Application instance is equal to stage, otherwise return false
boolean	isReleased() Return a flag indicating if the resources associated with this FacesContext instance have been released.
boolean	isValidationFailed() Return true if the validationFailed() method has been called for the current request.
abstract void	release() Release any resources associated with this FacesContext instance.
abstract void	renderResponse() Signal the JavaServer 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.
abstract void	responseComplete() Signal the JavaServer 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.
protected static void	setCurrentInstance(FacesContext context) Set the FacesContext instance for the request that is being processed by the current thread.
void	setCurrentPhaseId(PhaseId currentPhaseId) The implementation must call this method at the earliest possble point in time after entering into a new phase in the request processing lifecycle.
void	setExceptionHandler(ExceptionHandler exceptionHandler) Set the ExceptionHandler for this request.
void	setProcessingEvents(boolean processingEvents) Allows control of wheter or not the runtime will publish events when Application.publishEvent(FacesContext, Class, Object) or Application.publishEvent(FacesContext, Class, Class, Object) is called.
abstract void	setResponseStream(ResponseStream responseStream) Set the ResponseStream to which components should direct their binary output.
abstract void	setResponseWriter(ResponseWriter responseWriter) Set the ResponseWriter to which components should direct their character-based output.
abstract void	setViewRoot(UIViewRoot root) Set the root component that is associated with this request.
void	validationFailed() Sets a flag which indicates that a conversion or validation error occurred while processing the inputs.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FacesContext

public FacesContext()

Method Detail

getApplication

public abstract Application getApplication()

Return the 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 Application instance.

Throws:

IllegalStateException - if this method is called after this instance has been released

getAttributes

public Map<Object,Object> getAttributes()

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 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 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 ExternalContext.getRequestMap().

The default implementation throws UnsupportedOperationException and is provided for the sole purpose of not breaking existing applications that extend this class.

Throws:

IllegalStateException - if this method is called after this instance has been released

Since:

2.0

getPartialViewContext

public PartialViewContext getPartialViewContext()

Return the PartialViewContext for this request. The 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 PartialViewContext if one does not already exist.

Throws:

IllegalStateException - if this method is called after this instance has been released

Since:

2.0

getClientIdsWithMessages

public abstract Iterator<String> getClientIdsWithMessages()

Return an Iterator over the client identifiers for which at least one 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 addMessage(java.lang.String, javax.faces.application.FacesMessage).

Throws:

IllegalStateException - if this method is called after this instance has been released

getELContext

public ELContext getELContext()

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 ELContext.putContext(java.lang.Class, java.lang.Object) method on the instance, passing in FacesContext.class and the this reference for the FacesContext instance itself.

• If the Collection returned by Application.getELContextListeners() is non-empty, create an instance of ELContextEvent and pass it to each ELContextListener instance in the Collection by calling the ELContextListener.contextCreated(javax.el.ELContextEvent) method.

Throws:

IllegalStateException - if this method is called after this instance has been released

Since:

1.2

getExceptionHandler

public ExceptionHandler getExceptionHandler()

Return the ExceptionHandler for this request.

setExceptionHandler

public void setExceptionHandler(ExceptionHandler exceptionHandler)

Set the ExceptionHandler for this request.

Parameters:

exceptionHandler - the ExceptionHandler for this request.

getExternalContext

public abstract ExternalContext getExternalContext()

Return the 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 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.

Throws:

IllegalStateException - if this method is called after this instance has been released

getMaximumSeverity

public abstract FacesMessage.Severity getMaximumSeverity()

Return the maximum severity level recorded on any FacesMessages that has been queued, whether or not they are associated with any specific UIComponent. If no such messages have been queued, return null.

Throws:

IllegalStateException - if this method is called after this instance has been released

getMessages

public abstract Iterator<FacesMessage> getMessages()

Return an Iterator over the FacesMessages 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 addMessage(java.lang.String, javax.faces.application.FacesMessage).

Throws:

IllegalStateException - if this method is called after this instance has been released

getMessageList

public List<FacesMessage> getMessageList()

Like getMessages(), but returns a List<FacesMessage>, enabling use from EL expressions.

The default implementation throws UnsupportedOperationException and is provided for the sole purpose of not breaking existing applications that extend this class.

Returns:

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

getMessageList

public List<FacesMessage> getMessageList(String clientId)

Like 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.

Returns:

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

getMessages

public abstract Iterator<FacesMessage> getMessages(String clientId)

Return an Iterator over the FacesMessages that have been queued that are associated with the specified client identifier (if clientId is not null), or over the FacesMessages 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 addMessage(java.lang.String, javax.faces.application.FacesMessage).

Parameters:

clientId - The client identifier for which messages are requested, or null for messages not associated with any client identifier

Throws:

IllegalStateException - if this method is called after this instance has been released

getRenderKit

public abstract RenderKit getRenderKit()

Return the RenderKit instance for the render kit identifier specified on our UIViewRoot, if there is one. If there is no current UIViewRoot, if the UIViewRoot does not have a specified renderKitId, or if there is no RenderKit for the specified identifier, return null instead.

Throws:

IllegalStateException - if this method is called after this instance has been released

getRenderResponse

public abstract boolean getRenderResponse()

Return true if the renderResponse() method has been called for the current request.

Throws:

IllegalStateException - if this method is called after this instance has been released

getResponseComplete

public abstract boolean getResponseComplete()

Return true if the responseComplete() method has been called for the current request.

Throws:

IllegalStateException - if this method is called after this instance has been released

isValidationFailed

public boolean isValidationFailed()

Return true if the validationFailed() method has been called for the current request.

Throws:

IllegalStateException - if this method is called after this instance has been released

getResponseStream

public abstract ResponseStream getResponseStream()

Return the 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.

Throws:

IllegalStateException - if this method is called after this instance has been released

setResponseStream

public abstract void setResponseStream(ResponseStream responseStream)

Set the ResponseStream to which components should direct their binary output.

Parameters:

responseStream - The new ResponseStream for this response

Throws:

NullPointerException - if responseStream is null

IllegalStateException - if this method is called after this instance has been released

getResponseWriter

public abstract ResponseWriter getResponseWriter()

Return the 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.

Throws:

IllegalStateException - if this method is called after this instance has been released

setResponseWriter

public abstract void setResponseWriter(ResponseWriter responseWriter)

Set the ResponseWriter to which components should direct their character-based output.

Parameters:

responseWriter - The new ResponseWriter for this response

Throws:

IllegalStateException - if this method is called after this instance has been released

NullPointerException - if responseWriter is null

getViewRoot

public abstract UIViewRoot getViewRoot()

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().

Throws:

IllegalStateException - if this method is called after this instance has been released

setViewRoot

public abstract void setViewRoot(UIViewRoot root)

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 UIViewRoot.getViewMap().

Parameters:

root - The new component UIViewRoot component

Throws:

IllegalStateException - if this method is called after this instance has been released

NullPointerException - if root is null

addMessage

public abstract void addMessage(String clientId,
              FacesMessage message)

Append a FacesMessage to the set of messages associated with the specified client identifier, if clientId is not null. If clientId is null, this FacesMessage is assumed to not be associated with any specific component instance.

Parameters:

clientId - The client identifier with which this message is associated (if any)

message - The message to be appended

Throws:

IllegalStateException - if this method is called after this instance has been released

NullPointerException - if message is null

isReleased

public boolean isReleased()

Return a flag indicating if the resources associated with this FacesContext instance have been released.

Returns:

true if the resources have been released.

Since:

2.1

release

public abstract void release()

Release any resources associated with this FacesContext instance. Faces implementations may choose to pool instances in the associated 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 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 setCurrentInstance(javax.faces.context.FacesContext) 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

renderResponse

public abstract void renderResponse()

Signal the JavaServer 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

isPostback

public boolean isPostback()

This utility method simply returns the result of ResponseStateManager.isPostback(FacesContext).

The default implementation throws UnsupportedOperationException and is provided for the sole purpose of not breaking existing applications that extend this class.

Throws:

IllegalStateException - if this method is called after this instance has been released

Since:

2.0

responseComplete

public abstract void responseComplete()

Signal the JavaServer 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

validationFailed

public void validationFailed()

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 isValidationFailed().

Throws:

IllegalStateException - if this method is called after this instance has been released

getCurrentPhaseId

public PhaseId getCurrentPhaseId()

Return the value last set on this FacesContext instance when setCurrentPhaseId(javax.faces.event.PhaseId) was called.

Throws:

IllegalStateException - if this method is called after this instance has been released

Since:

2.0

setCurrentPhaseId

public void setCurrentPhaseId(PhaseId currentPhaseId)

The implementation must call this method at the earliest possble point in time after entering into a new phase in the request processing lifecycle.

Parameters:

currentPhaseId - The PhaseId for the current phase.

Throws:

IllegalStateException - if this method is called after this instance has been released

Since:

2.0

setProcessingEvents

public void setProcessingEvents(boolean processingEvents)

Allows control of wheter or not the runtime will publish events when Application.publishEvent(FacesContext, Class, Object) or Application.publishEvent(FacesContext, Class, Class, Object) is called.

Parameters:

processingEvents - flag indicating events should be processed or not

isProcessingEvents

public boolean isProcessingEvents()

Returns a flag indicating whether or not the runtime should publish events when asked to do so.

Returns:

true if events should be published, otherwise false

isProjectStage

public boolean isProjectStage(ProjectStage stage)

Return true if the current ProjectStage as returned by the Application instance is equal to stage, otherwise return false

Parameters:

stage - the ProjectStage to check

Throws:

IllegalStateException - if this method is called after this instance has been released

NullPointerException - if stage is null

getCurrentInstance

public static FacesContext getCurrentInstance()

Return the 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.

setCurrentInstance

protected static void setCurrentInstance(FacesContext context)

Set the FacesContext instance for the request that is being processed by the current thread.

Parameters:

context - The FacesContext instance for the current thread, or null if this thread no longer has a FacesContext instance.