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package javax.faces;
/**
* FactoryFinder
* implements the standard discovery algorithm for all factory objects
* specified in the JavaServer Faces APIs. For a given factory class
* name, a corresponding implementation class is searched for based on
* the following algorithm. Items are listed in order of decreasing
* search precedence:
*
* If the JavaServer Faces configuration file bundled into the
* WEB-INF directory of the webapp contains a
* factory entry of the given factory class name, that
* factory is used.
If the JavaServer Faces configuration files named by the
* javax.faces.CONFIG_FILES ServletContext init
* parameter contain any factory entries of the given
* factory class name, those injectionProvider are used, with the last one taking
* precedence.
If there are any JavaServer Faces configuration files bundled
* into the META-INF directory of any jars on the
* ServletContext's resource paths, the
* factory entries of the given factory class name in those
* files are used, with the last one taking precedence.
If a META-INF/services/{factory-class-name}
* resource is visible to the web application class loader for the
* calling application (typically as a injectionProvider of being present in the
* manifest of a JAR file), its first line is read and assumed to be the
* name of the factory implementation class to use.
If none of the above steps yield a match, the JavaServer Faces
* implementation specific class is used.
* If any of the injectionProvider found on any of the steps above happen to
* have a one-argument constructor, with argument the type being the
* abstract factory class, that constructor is invoked, and the previous
* match is passed to the constructor. For example, say the container
* vendor provided an implementation of {@link
* javax.faces.context.FacesContextFactory}, and identified it in
* META-INF/services/javax.faces.context.FacesContextFactory
* in a jar on the webapp ClassLoader. Also say this implementation
* provided by the container vendor had a one argument constructor that
* took a FacesContextFactory instance. The
* FactoryFinder system would call that one-argument
* constructor, passing the implementation of
* FacesContextFactory provided by the JavaServer Faces
* implementation.
* If a Factory implementation does not provide a proper one-argument
* constructor, it must provide a zero-arguments constructor in order to
* be successfully instantiated.
* Once the name of the factory implementation class is located, the
* web application class loader for the calling application is requested
* to load this class, and a corresponding instance of the class will be
* created. A side effect of this rule is that each web application
* will receive its own instance of each factory class, whether the
* JavaServer Faces implementation is included within the web
* application or is made visible through the container's facilities for
* shared libraries.
*/
public final class FactoryFinder {
// ----------------------------------------------------------- Constructors
/**
* Package-private constructor to disable instantiation of this class.
*/
FactoryFinder() {
}
// ----------------------------------------------------- Manifest Constants
/**
* The property name for the
* {@link javax.faces.application.ApplicationFactory} class name.
*/
public final static String APPLICATION_FACTORY =
"javax.faces.application.ApplicationFactory";
/**
* The property name for the
* {@link javax.faces.lifecycle.ClientWindowFactory} class name.
* @since 2.2
*/
public final static String CLIENT_WINDOW_FACTORY =
"javax.faces.lifecycle.ClientWindowFactory";
/**
* The property name for the {@link
* javax.faces.context.ExceptionHandlerFactory} class name.
*/
public final static String EXCEPTION_HANDLER_FACTORY =
"javax.faces.context.ExceptionHandlerFactory";
/**
* The property name for the {@link
* javax.faces.context.ExternalContextFactory} class name.
*/
public final static String EXTERNAL_CONTEXT_FACTORY =
"javax.faces.context.ExternalContextFactory";
/**
* The property name for the
* {@link javax.faces.context.FacesContextFactory} class name.
*/
public final static String FACES_CONTEXT_FACTORY =
"javax.faces.context.FacesContextFactory";
/**
* The property name for the
* {@link javax.faces.view.facelets.FaceletCacheFactory} class name.
*
* @since 2.1
*/
public final static String FACELET_CACHE_FACTORY =
"javax.faces.view.facelets.FaceletCacheFactory";
/**
* The property name for the
* {@link javax.faces.context.FlashFactory} class name.
*
* @since 2.2
*/
public final static String FLASH_FACTORY =
"javax.faces.context.FlashFactory";
/**
* The property name for the
* {@link javax.faces.flow.FlowHandlerFactory} class name.
*
* @since 2.2
*/
public final static String FLOW_HANDLER_FACTORY =
"javax.faces.flow.FlowHandlerFactory";
/**
* The property name for the {@link
* javax.faces.context.PartialViewContextFactory} class name.
*/
public final static String PARTIAL_VIEW_CONTEXT_FACTORY =
"javax.faces.context.PartialViewContextFactory";
/**
* The property name for the {@link
* javax.faces.component.visit.VisitContextFactory} class name.
*/
public final static String VISIT_CONTEXT_FACTORY =
"javax.faces.component.visit.VisitContextFactory";
/**
* The property name for the
* {@link javax.faces.lifecycle.LifecycleFactory} class name.
*/
public final static String LIFECYCLE_FACTORY =
"javax.faces.lifecycle.LifecycleFactory";
/**
* The property name for the
* {@link javax.faces.render.RenderKitFactory} class name.
*/
public final static String RENDER_KIT_FACTORY =
"javax.faces.render.RenderKitFactory";
/**
* The property name for the {@link
* javax.faces.view.ViewDeclarationLanguage} class name.
*/
public final static String VIEW_DECLARATION_LANGUAGE_FACTORY =
"javax.faces.view.ViewDeclarationLanguageFactory";
/**
* The property name for the {@link
* javax.faces.view.facelets.TagHandlerDelegate} class name.
*/
public final static String TAG_HANDLER_DELEGATE_FACTORY =
"javax.faces.view.facelets.TagHandlerDelegateFactory";
// ------------------------------------------------------- Static Variables
static final CurrentThreadToServletContext FACTORIES_CACHE;
static {
FACTORIES_CACHE = new CurrentThreadToServletContext();
}
// --------------------------------------------------------- Public Methods
/**
* Create (if
* necessary) and return a per-web-application instance of the
* appropriate implementation class for the specified JavaServer
* Faces factory class, based on the discovery algorithm described
* in the class description.
*
* The standard injectionProvider and wrappers
* in JSF all implement the interface {@link FacesWrapper}. If the
* returned Object is an implementation of one of the
* standard injectionProvider, it must be legal to cast it to an instance of
* FacesWrapper and call {@link
* FacesWrapper#getWrapped} on the instance.
*
* @param factoryName Fully qualified name of the JavaServer Faces factory
* for which an implementation instance is requested
* @throws FacesException if the web application class loader
* cannot be identified
* @throws FacesException if an instance of the configured factory
* implementation class cannot be loaded
* @throws FacesException if an instance of the configured factory
* implementation class cannot be instantiated
* @throws IllegalArgumentException if factoryName does not
* identify a standard JavaServer Faces factory name
* @throws IllegalStateException if there is no configured factory
* implementation class for the specified factory name
* @throws NullPointerException if factoryname
* is null
*/
public static Object getFactory(String factoryName)
throws FacesException {
FactoryFinderInstance manager;
// Bug 20458755: If the factory being requested is the special
// SERVLET_CONTEXT_FINDER, do not lazily create the FactoryFinderInstance.
if (null != factoryName && factoryName.equals(ServletContextFacesContextFactory.SERVLET_CONTEXT_FINDER_NAME)) {
manager = FACTORIES_CACHE.getApplicationFactoryManager(false);
} else {
manager = FACTORIES_CACHE.getApplicationFactoryManager();
}
Object result = null;
if (null != manager) {
result = manager.getFactory(factoryName);
}
return result;
}
/**
* This method will store the argument
* factoryName/implName mapping in such a way that
* {@link #getFactory} will find this mapping when searching for a
* match.
*
* This method has no effect if getFactory() has
* already been called looking for a factory for this
* factoryName.
*
* This method can be used by implementations to store a factory
* mapping while parsing the Faces configuration file
*
* @throws IllegalArgumentException if factoryName does not
* identify a standard JavaServer Faces factory name
* @throws NullPointerException if factoryname
* is null
*/
public static void setFactory(String factoryName,
String implName) {
FactoryFinderInstance manager =
FACTORIES_CACHE.getApplicationFactoryManager();
manager.addFactory(factoryName, implName);
}
/**
* Release any
* references to factory instances associated with the class loader
* for the calling web application. This method must be called during of
* web application shutdown.
*
* @throws FacesException if the web application class loader
* cannot be identified
*/
public static void releaseFactories() throws FacesException {
synchronized(FACTORIES_CACHE) {
if (!FACTORIES_CACHE.applicationMap.isEmpty()) {
FactoryFinderInstance fm = FACTORIES_CACHE.getApplicationFactoryManager();
fm.releaseFactories();
}
FACTORIES_CACHE.removeApplicationFactoryManager();
}
}
// -------------------------------------------------------- Private Methods
// Called via reflection from automated tests.
private static void reInitializeFactoryManager() {
FACTORIES_CACHE.resetSpecialInitializationCaseFlags();
}
}