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## javax.faces
Class FactoryFinder

    java.lang.Object
      javax.faces.FactoryFinder

    public final class FactoryFinder

extends java.lang.Object

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 result 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 result 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 result 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 `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.

Field Summary
`static java.lang.String` | `APPLICATION_FACTORY` The property name for the `ApplicationFactory` class name.
`static java.lang.String` | `EXCEPTION_HANDLER_FACTORY` The property name for the `ExceptionHandlerFactory` class name.
`static java.lang.String` | `EXTERNAL_CONTEXT_FACTORY` The property name for the `ExternalContextFactory` class name.
`static java.lang.String` | `FACELET_CACHE_FACTORY` The property name for the `FaceletCacheFactory` class name.
`static java.lang.String` | `FACES_CONTEXT_FACTORY` The property name for the `FacesContextFactory` class name.
`static java.lang.String` | `LIFECYCLE_FACTORY` The property name for the `LifecycleFactory` class name.
`static java.lang.String` | `PARTIAL_VIEW_CONTEXT_FACTORY` The property name for the `PartialViewContextFactory` class name.
`static java.lang.String` | `RENDER_KIT_FACTORY` The property name for the `RenderKitFactory` class name.
`static java.lang.String` | `TAG_HANDLER_DELEGATE_FACTORY` The property name for the `TagHandlerDelegate` class name.
`static java.lang.String` | `VIEW_DECLARATION_LANGUAGE_FACTORY` The property name for the `ViewDeclarationLanguage` class name.
`static java.lang.String` | `VISIT_CONTEXT_FACTORY` The property name for the `VisitContextFactory` class name.

Method Summary
`static java.lang.Object` | `getFactory(java.lang.String factoryName)` 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.
`static void` | `releaseFactories()` Release any references to factory instances associated with the class loader for the calling web application.
`static void` | `setFactory(java.lang.String factoryName, java.lang.String implName)` This method will store the argument `factoryName/implName` mapping in such a way that `getFactory(java.lang.String)` will find this mapping when searching for a match.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### APPLICATION_FACTORY

    public static final java.lang.String APPLICATION_FACTORY

  The property name for the `ApplicationFactory` class name.

  See Also:
    Constant Field Values

### EXCEPTION_HANDLER_FACTORY

    public static final java.lang.String EXCEPTION_HANDLER_FACTORY

  The property name for the `ExceptionHandlerFactory` class name.

  See Also:
    Constant Field Values

### EXTERNAL_CONTEXT_FACTORY

    public static final java.lang.String EXTERNAL_CONTEXT_FACTORY

  The property name for the `ExternalContextFactory` class name.

  See Also:
    Constant Field Values

### FACES_CONTEXT_FACTORY

    public static final java.lang.String FACES_CONTEXT_FACTORY

  The property name for the `FacesContextFactory` class name.

  See Also:
    Constant Field Values

### FACELET_CACHE_FACTORY

    public static final java.lang.String FACELET_CACHE_FACTORY

  The property name for the `FaceletCacheFactory` class name.

  Since:
    2.1
  See Also:
    Constant Field Values

### PARTIAL_VIEW_CONTEXT_FACTORY

    public static final java.lang.String PARTIAL_VIEW_CONTEXT_FACTORY

  The property name for the `PartialViewContextFactory` class name.

  See Also:
    Constant Field Values

### VISIT_CONTEXT_FACTORY

    public static final java.lang.String VISIT_CONTEXT_FACTORY

  The property name for the `VisitContextFactory` class name.

  See Also:
    Constant Field Values

### LIFECYCLE_FACTORY

    public static final java.lang.String LIFECYCLE_FACTORY

  The property name for the `LifecycleFactory` class name.

  See Also:
    Constant Field Values

### RENDER_KIT_FACTORY

    public static final java.lang.String RENDER_KIT_FACTORY

  The property name for the `RenderKitFactory` class name.

  See Also:
    Constant Field Values

### VIEW_DECLARATION_LANGUAGE_FACTORY

    public static final java.lang.String VIEW_DECLARATION_LANGUAGE_FACTORY

  The property name for the `ViewDeclarationLanguage` class name.

  See Also:
    Constant Field Values

### TAG_HANDLER_DELEGATE_FACTORY

    public static final java.lang.String TAG_HANDLER_DELEGATE_FACTORY

  The property name for the `TagHandlerDelegate` class name.

  See Also:
    Constant Field Values

Method Detail

### getFactory

    public static java.lang.Object getFactory(java.lang.String factoryName)
                                       throws FacesException

  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 result and wrappers in JSF all implement the interface `FacesWrapper`. If the returned `Object` is an implementation of one of the standard result, it must be legal to cast it to an instance of `FacesWrapper` and call `FacesWrapper.getWrapped()` on the instance.

  Parameters:
    `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
    `FacesException` - if an instance of the configured factory implementation class cannot be loaded
    `FacesException` - if an instance of the configured factory implementation class cannot be instantiated
    `java.lang.IllegalArgumentException` - if `factoryName` does not identify a standard JavaServer Faces factory name
    `java.lang.IllegalStateException` - if there is no configured factory implementation class for the specified factory name
    `java.lang.NullPointerException` - if `factoryname` is null

### setFactory

    public static void setFactory(java.lang.String factoryName,
                                  java.lang.String implName)

  This method will store the argument `factoryName/implName` mapping in such a way that `getFactory(java.lang.String)` 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:
    `java.lang.IllegalArgumentException` - if `factoryName` does not identify a standard JavaServer Faces factory name
    `java.lang.NullPointerException` - if `factoryname` is null

### releaseFactories

    public static void releaseFactories()
                                 throws FacesException

  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

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