OpenCOM
Interface IUnknown

All Known Subinterfaces:

IOpenCOM

All Known Implementing Classes:

CFMetaInterface, OpenCOM, OpenCOMComponent

public interface IUnknown

The IUnknown interface is a central aspect of OpenCOM. However, it is not actually required in the Java version. Standard Interface/Object behaviour in Java negates the need for QueryInterface. Furthermore, the garbage collector means addref and release are not required. However, IUnknown remains in this version to present the same (okay similar) programming model to traditional OpenCOM. Note: QI is an improvement over object casting, like OpenCOM you can detect if the interface is available on the component before invoking it. That is, we retain one of the programming model benefits of COM.

Method Summary

java.lang.Object

QueryInterface(java.lang.String interfaceName) Obtain a reference to the interface of the type passed as parameter

Method Detail

QueryInterface

java.lang.Object QueryInterface(java.lang.String interfaceName)

Obtain a reference to the interface of the type passed as parameter

Parameters:

interfaceName - a string representing the Java interaface type, equivalent to the IID type in COM.

Returns:

an Object representing a reference to the component hosting the interface requested.