com.bea.wlcp.wlng.api.util
Class InstanceFactory

java.lang.Object
  com.bea.wlcp.wlng.api.util.InstanceFactory

public final class InstanceFactory

extends java.lang.Object

Common factory used to retrieve instances of for a given interface, class or abstract class. The implementation will be located based on these rules:

1. Find a mapping from the provided interface/class to the implementation. Mappings are configured in a file called "instancemap". Every jar in WebLogic can have its own mapping file, which is a standard java.util.Properties file. To override the default mapping defined in the instancemap files, include a file called instancemap.override where new mappings are defined.
2. Instantiate theClass if it has a public constructor or static singleton method.
3. Instantiate theClass+"Impl" if it exists and has a public constructor or static singleton method.

Example instancemap file:

 com.bea.wlcp.wlng.MyInterface=com.bea.wlcp.wlng.MyImplementation
 com.bea.wlcp.wlng.MyOtherInterface=com.bea.wlcp.wlng.MyOtherImplementation
 

Method Summary

java.lang.Object	getImplementation(java.lang.Class theClass) Retrieves a class that implements/extends a given interface/class.
static InstanceFactory	getInstance()

Methods inherited from class java.lang.Object

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

Method Detail

getImplementation

public java.lang.Object getImplementation(java.lang.Class theClass)
                                   throws java.lang.NoClassDefFoundError,
                                          java.lang.reflect.InvocationTargetException

Retrieves a class that implements/extends a given interface/class.

Parameters:

theClass - The interface/class that the returned object should implement.

Returns:

The implementation.

Throws:

java.lang.NoClassDefFoundError - If no implementation is available.

java.lang.reflect.InvocationTargetException - If there is an exception cast from the implementation. The cause will contain the actual exception.

getInstance

public static InstanceFactory getInstance()