Class Renderer
- Direct Known Subclasses:
RendererWrapper
A Renderer converts
the internal representation of UIComponent
s into the output
stream (or writer) associated with the response we are creating for a
particular request. Each Renderer
knows how to render
one or more UIComponent
types (or classes), and advertises a
set of render-dependent attributes that it recognizes for each
supported UIComponent
.
Families of Renderer
s are packaged as a RenderKit
,
and together support the rendering of all of the UIComponent
s
in a view associated with a FacesContext
. Within the set of
Renderer
s for a particular RenderKit
, each must be
uniquely identified by the rendererType
property.
Individual Renderer
instances will be instantiated as requested
during the rendering process, and will remain in existence for the
remainder of the lifetime of a web application. Because each instance
may be invoked from more than one request processing thread simultaneously,
they MUST be programmed in a thread-safe manner.
If the ListenerFor
annotation is
attached to the class definition of a Renderer
, that
class must also implement ComponentSystemEventListener
, and the action
pertaining to the processing of ResourceDependency
on a
Renderer
described in ListenerFor
must be taken.
If the ResourceDependency
annotation is attached to the class definition of a
Renderer
, the action pertaining to the processing of
ResourceDependency
on a Renderer
described
in UIComponent.getChildren()
must be taken.
-
Field Summary
Modifier and TypeFieldDescriptionstatic final String
The key in the component passthrough attributesMap
for the localName of the element corresponding to the component. -
Constructor Summary
-
Method Summary
Modifier and TypeMethodDescriptionconvertClientId
(FacesContext context, String clientId) Convert the component generated client id to a form suitable for transmission to the client.void
decode
(FacesContext context, UIComponent component) Decode any new state of the specifiedUIComponent
from the request contained in the specifiedFacesContext
, and store that state on theUIComponent
.void
encodeBegin
(FacesContext context, UIComponent component) Render the beginning specifiedUIComponent
to the output stream or writer associated with the response we are creating.void
encodeChildren
(FacesContext context, UIComponent component) Render the child components of thisUIComponent
, following the rules described forencodeBegin()
to acquire the appropriate value to be rendered.void
encodeEnd
(FacesContext context, UIComponent component) Render the ending of the current state of the specifiedUIComponent
, following the rules described forencodeBegin()
to acquire the appropriate value to be rendered.getConvertedValue
(FacesContext context, UIComponent component, Object submittedValue) Attempt to convert previously stored state information into an object of the type required for this component (optionally using the registeredConverter
for this component, if there is one).boolean
Return a flag indicating whether thisRenderer
is responsible for rendering the children the component it is asked to render.
-
Field Details
-
PASSTHROUGH_RENDERER_LOCALNAME_KEY
The key in the component passthrough attributes
Map
for the localName of the element corresponding to the component.- Since:
- 2.2
- See Also:
-
-
Constructor Details
-
Renderer
public Renderer()
-
-
Method Details
-
decode
Decode any new state of the specified
UIComponent
from the request contained in the specifiedFacesContext
, and store that state on theUIComponent
.During decoding, events may be enqueued for later processing (by event listeners that have registered an interest), by calling
queueEvent()
on the associatedUIComponent
.- Parameters:
context
-FacesContext
for the request we are processingcomponent
-UIComponent
to be decoded.- Throws:
NullPointerException
- ifcontext
orcomponent
isnull
-
encodeBegin
Render the beginning specified
UIComponent
to the output stream or writer associated with the response we are creating. If the conversion attempted in a previous call togetConvertedValue()
for this component failed, the state information saved during execution ofdecode()
should be used to reproduce the incorrect input.- Parameters:
context
-FacesContext
for the request we are processingcomponent
-UIComponent
to be rendered- Throws:
IOException
- if an input/output error occurs while renderingNullPointerException
- ifcontext
orcomponent
is null
-
encodeChildren
Render the child components of this
UIComponent
, following the rules described forencodeBegin()
to acquire the appropriate value to be rendered. This method will only be called if therendersChildren
property of this component istrue
.- Parameters:
context
-FacesContext
for the response we are creatingcomponent
-UIComponent
whose children are to be rendered- Throws:
IOException
- if an input/output error occurs while renderingNullPointerException
- ifcontext
orcomponent
isnull
-
encodeEnd
Render the ending of the current state of the specified
UIComponent
, following the rules described forencodeBegin()
to acquire the appropriate value to be rendered.- Parameters:
context
-FacesContext
for the response we are creatingcomponent
-UIComponent
to be rendered- Throws:
IOException
- if an input/output error occurs while renderingNullPointerException
- ifcontext
orcomponent
isnull
-
convertClientId
Convert the component generated client id to a form suitable for transmission to the client.
The default implementation returns the argument
clientId
unchanged.- Parameters:
context
-FacesContext
for the current requestclientId
- the client identifier to be converted to client a specific format.- Throws:
NullPointerException
- ifcontext
orclientId
isnull
-
getRendersChildren
public boolean getRendersChildren()Return a flag indicating whether this
Renderer
is responsible for rendering the children the component it is asked to render. The default implementation returnsfalse
. -
getConvertedValue
public Object getConvertedValue(FacesContext context, UIComponent component, Object submittedValue) throws ConverterException Attempt to convert previously stored state information into an object of the type required for this component (optionally using the registered
Converter
for this component, if there is one). If conversion is successful, the new value should be returned from this method; if not, aConverterException
should be thrown.- Parameters:
context
-FacesContext
for the request we are processingcomponent
-UIComponent
to be decoded.submittedValue
- a value stored on the component duringdecode
.- Throws:
ConverterException
- if the submitted value cannot be converted successfully.NullPointerException
- ifcontext
orcomponent
isnull
-