Language Bindings

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UNO language bindings enable developers to use and implement UNO objects in arbitrary programming languages. Thus, the existing language bindings connect between implementation environments, such as Java, C++, Basic and OLE Automation. The connection is accomplished by bridges. The following terms are used in our discussion about the implementation of language bindings.

In our context, the target language or target environment denotes the language or environment from which the UNO component model is accessed. The bridging language is the language used for writing the bridge code.

An object-oriented language determines the layout of its objects in memory. We call an object that is based on this layout a language object. The layout along with everything that relates to it, such as creation, destruction, and interaction, is the object model of a language.

A UNO proxy (short: proxy) is created by a bridge and it is a language object that represents a UNO object in the target language. It provides the same functionality as the original UNO object. There are two terms which further specialize a UNO proxy. The UNO interface proxy is a UNO proxy representing exactly one interface of a UNO object, whereas a UNO object proxy represents an uno object with all its interfaces.

An interface bridge bridges one UNO interface to one interface of the target language, that is, to a UNO interface proxy. When the proxy is queried for another interface that is implemented by the UNO object, then another interface proxy is returned. In contrast, an object bridge bridges entire UNO objects into UNO object proxies of the target language. The object proxy receives calls for all interfaces of the UNO object.

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