FlashFactory (Jakarta EE Web Profile API)

java.lang.Object
- jakarta.faces.context.FlashFactory

All Implemented Interfaces:

FacesWrapper<FlashFactory>
```
public abstract class FlashFactory
extends Object
implements FacesWrapper<FlashFactory>
```
FlashFactory is a factory object that creates (if needed) and returns Flash instances. Implementations of Jakarta Faces must provide at least a default implementation of Flash.
There must be one FlashFactory instance per web application that is utilizing Jakarta Faces. This instance can be acquired, in a portable manner, by calling:
```
 FlashFactory factory = (FlashFactory) FactoryFinder.getFactory(FactoryFinder.FLASH_FACTORY);
 
```
The common way to access the flash instance from Java code is still via ExternalContext.getFlash(). The common way to access the flash from Faces views is the implicit Jakarta Expression Language object "flash". The runtime must ensure that the FlashFactory is used to instantiate the flash.
Usage: extend this class and push the implementation being wrapped to the constructor and use getWrapped() to access the instance being wrapped.
Since:

2.2

Constructor Summary

Constructors
Constructor	Description
`FlashFactory()`	Deprecated. Use the other constructor taking the implementation being wrapped.
`FlashFactory(FlashFactory wrapped)`	If this factory has been decorated, the implementation doing the decorating should push the implementation being wrapped to this constructor.

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`abstract Flash`	`getFlash(boolean create)`	Create (if needed) and return a `Flash` instance for this web application.
`FlashFactory`	`getWrapped()`	If this factory has been decorated, the implementation doing the decorating may override this method to provide access to the implementation being wrapped.

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

- Constructor Detail
  - FlashFactory
```
@Deprecated
public FlashFactory()
```
    Deprecated.
    Use the other constructor taking the implementation being wrapped.
  - FlashFactory
```
public FlashFactory(FlashFactory wrapped)
```
    If this factory has been decorated, the implementation doing the decorating should push the implementation being wrapped to this constructor. The getWrapped() will then return the implementation being wrapped.
    
    Parameters:
    
    wrapped - The implementation being wrapped.
- Method Detail
  - getWrapped
```
public FlashFactory getWrapped()
```
    If this factory has been decorated, the implementation doing the decorating may override this method to provide access to the implementation being wrapped.
    
    Specified by:
    
    getWrapped in interface FacesWrapper<FlashFactory>
    
    Returns:
    
    the wrapped instance.
  - getFlash
```
public abstract Flash getFlash(boolean create)
```
    Create (if needed) and return a Flash instance for this web application.
    
    Parameters:
    
    create - true to create a new instance for this request if necessary; false to return null if there's no instance in the current session.
    
    Returns:
    
    the instance of Flash.
    
    Since:
    
    2.2