com.sap.netweaver.bc.rf.util.context

Class ContextFactoryRegistry

java.lang.Object

com.sap.netweaver.bc.rf.util.context.ContextFactoryRegistry

public class ContextFactoryRegistry
extends Object

Context factory registry holding all registered context factories and providing means to get and set a context. In order to access a context through this class, each context factory needs to register with this registry. This must be done prior to any call trying to access a context for that context factory. Beware of the dangers registering a context factory in the static initializer. No one ensures, that the static initializer is called before a context for the context factory is requested by the type unsafe API of this registry.

Created 20. Januar 2003

See Also:

IContextFactory

Constructor Summary

Constructors

Constructor and Description
ContextFactoryRegistry()

Method Summary

Modifier and Type	Method and Description
static Object	getTypeUnsafeContext(Class contextFactoryClass) Get actual context from stack of contexts.
Object	getTypeUnsafeContextOrNullIfUnavailable(Class contextFactoryClass) Get actual context from stack of contexts.
static Object	popTypeUnsafeContext(Class contextFactoryClass) Get and remove actual context from the stack of contexts.
static void	pushTypeUnsafeContext(Class contextFactoryClass, Object context) Add new context to the top of the stack of contexts.
static void	registerContextFactory(IContextFactory contextFactory) Register context factory instance.
static void	setTypeUnsafeContext(Class contextFactoryClass, Object context) Replace actual context with new one in stack of contexts.
static void	unregisterContextFactory(Class contextFactoryClass) Unregister context factory by context factory class (name).
static void	unregisterContextFactory(IContextFactory contextFactory) Unregister context factory by context factory instance.

Methods inherited from class java.lang.Object

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

Constructor Detail

ContextFactoryRegistry

public ContextFactoryRegistry()

Method Detail

registerContextFactory

public static void registerContextFactory(IContextFactory contextFactory)
                                   throws ContextFactoryRegistrationError

Register context factory instance.

Parameters:

contextFactory - context factory instance to be registered

Throws:

ContextFactoryRegistrationError - when the context factory is already registered with the context factory registry

unregisterContextFactory

public static void unregisterContextFactory(Class contextFactoryClass)
                                     throws ContextFactoryRegistrationError

Unregister context factory by context factory class (name).

Parameters:

contextFactoryClass - context factory class (name) to be unregistered

Throws:

ContextFactoryRegistrationError - when the context factory isn't registered with the context factory registry

unregisterContextFactory

public static void unregisterContextFactory(IContextFactory contextFactory)
                                     throws ContextFactoryRegistrationError

Unregister context factory by context factory instance.

Parameters:

contextFactory - context factory to be unregistered

Throws:

ContextFactoryRegistrationError - when the context factory isn't registered with the context factory registry

getTypeUnsafeContext

public static Object getTypeUnsafeContext(Class contextFactoryClass)
                                   throws ContextUnavailableException,
                                          ContextFactoryRegistrationError

Get actual context from stack of contexts.

Parameters:

contextFactoryClass - context factory class used to look up context factory

Returns:

actual context on the context stack

Throws:

ContextUnavailableException - when no (more) context is available on the context stack

ContextFactoryRegistrationError - when the context factory isn't registered with the context factory registry

getTypeUnsafeContextOrNullIfUnavailable

public Object getTypeUnsafeContextOrNullIfUnavailable(Class contextFactoryClass)

Get actual context from stack of contexts. Return null if none is available and don't throw a ContextUnavailableException.

Parameters:

contextFactoryClass - TBD: Description of the incoming method parameter

Returns:

actual context on the context stack

setTypeUnsafeContext

public static void setTypeUnsafeContext(Class contextFactoryClass,
                                        Object context)
                                 throws ContextFactoryRegistrationError

Replace actual context with new one in stack of contexts. If no context is stored, this one will be added.

Parameters:

context - new actual context replacing the old one on the stack

contextFactoryClass - context factory class used to look up context factory

Throws:

ContextFactoryRegistrationError - when the context factory isn't registered with the context factory registry

popTypeUnsafeContext

public static Object popTypeUnsafeContext(Class contextFactoryClass)
                                   throws ContextUnavailableException,
                                          ContextFactoryRegistrationError

Get and remove actual context from the stack of contexts.

Parameters:

contextFactoryClass - context factory class used to look up context factory

Returns:

last actual context on the context stack

Throws:

ContextUnavailableException - when no (more) context is available on the context stack

ContextFactoryRegistrationError - when the context factory isn't registered with the context factory registry

pushTypeUnsafeContext

public static void pushTypeUnsafeContext(Class contextFactoryClass,
                                         Object context)
                                  throws ContextFactoryRegistrationError

Add new context to the top of the stack of contexts.

Parameters:

context - new actual context

contextFactoryClass - context factory class used to look up context factory

Throws:

ContextFactoryRegistrationError - when the context factory isn't registered with the context factory registry