Package jakarta.faces.view.facelets

Class FaceletCache<V>

java.lang.Object

jakarta.faces.view.facelets.FaceletCache<V>

public abstract class FaceletCache<V>
extends Object

This API defines the facility by which the Facelets ViewDeclarationLanguage creates and caches instances of Facelets.

The cache handles two different kinds of Facelets: View Facelets and View Metadata Facelets. The former is the usual Facelet that provides for the construction of a UIComponent tree. This kind of Facelet is accessed via the getFacelet(java.net.URL) and isFaceletCached(java.net.URL) methods. The latter is a special kind of Facelet that corresponds to ViewDeclarationLanguage.getViewMetadata(jakarta.faces.context.FacesContext, java.lang.String). This kind of Facelet is accessed via the getViewMetadataFacelet(java.net.URL) and isViewMetadataFaceletCached(java.net.URL) methods.

Since:

2.1

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	FaceletCache.MemberFactory<V>	Factory interface for creating Facelet or View Metadata Facelet instances.

Constructor Summary

Constructors

Constructor	Description
FaceletCache()

Method Summary

Modifier and Type	Method	Description
abstract V	getFacelet(URL url)	Returns a cached Facelet instance.
protected FaceletCache.MemberFactory<V>	getMemberFactory()	Returns the FaceletCache.MemberFactory passed to setCacheFactories(jakarta.faces.view.facelets.FaceletCache.MemberFactory<V>, jakarta.faces.view.facelets.FaceletCache.MemberFactory<V>) for the purpose of creating Facelet instance.
protected FaceletCache.MemberFactory<V>	getMetadataMemberFactory()	Returns the FaceletCache.MemberFactory passed to setCacheFactories(jakarta.faces.view.facelets.FaceletCache.MemberFactory<V>, jakarta.faces.view.facelets.FaceletCache.MemberFactory<V>) for the purpose of creating View Metadata Facelet instance.
abstract V	getViewMetadataFacelet(URL url)	Returns a cached View Metadata Facelet instance.
abstract boolean	isFaceletCached(URL url)	Determines whether a cached Facelet instance exists for this URL.
abstract boolean	isViewMetadataFaceletCached(URL url)	Determines whether a cached View Metadata Facelet instance exists for this URL.
void	setCacheFactories(FaceletCache.MemberFactory<V> faceletFactory, FaceletCache.MemberFactory<V> viewMetadataFaceletFactory)	This must be called by the runtime at startup time, before any requests are serviced, and allows for the FaceletCache implementation to provide the FaceletCache.MemberFactory instances that will be used to create instances of Facelets and View Metadata Facelets.

Methods inherited from class java.lang.Object

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

Constructor Detail

FaceletCache

public FaceletCache()

Method Detail

getFacelet

public abstract V getFacelet(URL url)
                      throws IOException

Returns a cached Facelet instance. If no instance is available, it will be created using the Facelet FaceletCache.MemberFactory and stored in the cache.

Parameters:

url - URL for the Facelet being retrieved

Returns:

a cached or new Facelet

Throws:

NullPointerException - if argument url is null.

IOException - if unable to load a file necessary to respond to service this method.

isFaceletCached

public abstract boolean isFaceletCached(URL url)

Determines whether a cached Facelet instance exists for this URL. Returns true if a cached instance exists, false otherwise

Parameters:

url - URL for the Facelet

Returns:

true if a cached instance exists, false otherwise

Throws:

NullPointerException - if argument url is null.

getViewMetadataFacelet

public abstract V getViewMetadataFacelet(URL url)
                                  throws IOException

Returns a cached View Metadata Facelet instance. If no instance is available, it will be created using the View Metadata Facelet FaceletCache.MemberFactory and stored in the cache.

Parameters:

url - URL for the View Metadata Facelet being retrieved

Returns:

a cached or new View Metadata Facelet instance

Throws:

NullPointerException - if argument url is null.

IOException - if unable to load a file necessary to respond to service this method.

isViewMetadataFaceletCached

public abstract boolean isViewMetadataFaceletCached(URL url)

Determines whether a cached View Metadata Facelet instance exists for this URL. Returns true if a cached instance exists, false otherwise

Parameters:

url - URL for the View Metadata Facelet

Returns:

true if a cached instance exists, false otherwise

Throws:

NullPointerException - if argument url is null.

setCacheFactories

public void setCacheFactories(FaceletCache.MemberFactory<V> faceletFactory,
                              FaceletCache.MemberFactory<V> viewMetadataFaceletFactory)

This must be called by the runtime at startup time, before any requests are serviced, and allows for the FaceletCache implementation to provide the FaceletCache.MemberFactory instances that will be used to create instances of Facelets and View Metadata Facelets.

Parameters:

faceletFactory - the FaceletCache.MemberFactory instance that will be used to create instances of Facelets.

viewMetadataFaceletFactory - the FaceletCache.MemberFactory instance that will be used to create instances of metadata Facelets.

Throws:

NullPointerException - if either argument is null

Since:

2.3

getMemberFactory

protected FaceletCache.MemberFactory<V> getMemberFactory()

Returns the FaceletCache.MemberFactory passed to setCacheFactories(jakarta.faces.view.facelets.FaceletCache.MemberFactory<V>, jakarta.faces.view.facelets.FaceletCache.MemberFactory<V>) for the purpose of creating Facelet instance.

Returns:

the FaceletCache.MemberFactory passed to setCacheFactories(jakarta.faces.view.facelets.FaceletCache.MemberFactory<V>, jakarta.faces.view.facelets.FaceletCache.MemberFactory<V>) for the purpose of creating Facelet instance.

getMetadataMemberFactory

protected FaceletCache.MemberFactory<V> getMetadataMemberFactory()

Returns the FaceletCache.MemberFactory passed to setCacheFactories(jakarta.faces.view.facelets.FaceletCache.MemberFactory<V>, jakarta.faces.view.facelets.FaceletCache.MemberFactory<V>) for the purpose of creating View Metadata Facelet instance.

Returns:

the FaceletCache.MemberFactory passed to setCacheFactories(jakarta.faces.view.facelets.FaceletCache.MemberFactory<V>, jakarta.faces.view.facelets.FaceletCache.MemberFactory<V>) for the purpose of creating View Metadata Facelet instance.