Write Registration Info Using Helper Method

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UNO components have to be registered with the registry database of a service manager. In an office installation, this is the file types.rdb (up through 1.1.0, applicat.rdb) for all predefined services. A service manager can use this database to find the implementations for a service. For instance, if an instance of your component is created using the following call.

  Object imageShrink = 

Using the given service or implementation name, the service manager looks up the location of the corresponding jar file in the registry and instantiates the component.

Documentation note.png If you want to use the service manager of the Java UNO runtime, com.sun.star.comp.servicemanager.ServiceManager (jurt.jar), to instantiate your service implementation, then you would have to create the service manager and add the factory for "org.openoffice.test.ImageShrink" programmatically, because the Java service manager does not use the registry.

Alternatively, you can use com.sun.star.comp.helper.RegistryServiceFactory from juh.jar which is registry-based. Its drawback is that it delegates to a C++ implementation of the service manager through the java-bridge.

During the registration, a component writes the necessary information into the registry. The process to write the information is triggered externally when a client calls the __writeRegistryServiceInfo() method at the component.

  public static boolean __writeRegistryServiceInfo(XRegistryKey regKey)

The caller passes an com.sun.star.registry.XRegistryKey interface that is used by the method to write the registry entries. Again, the FactoryHelper class offers a way to implement the method:

  // static __writeRegistryServiceInfo implementation
  public static boolean __writeRegistryServiceInfo(XRegistryKey regKey) {
      return FactoryHelper.writeRegistryServiceInfo( ImageShrink.class.getName(), 
      __serviceName, regKey); 

The writeRegistryServiceInfo method takes three arguments:

  • implementation name
  • service name
  • XRegistryKey

Use tools such as regcomp to register a component. This tool takes the path to the jar file containing the component as an argument. Since the jar can contain several classes, the class that implements the __writeRegistryServiceInfo() method must be pointed out by means of the manifest. Again, the RegistrationClassName entry determines the correct class. For example:

 RegistrationClassName: org.openoffice.comp.test.ImageShrink

The above entry is also necessary to locate the class that provides __getServiceFactory(), therefore the functions __writeRegistryServiceInfo() and __getServiceFactory() have to be in the same class.

Content on this page is licensed under the Public Documentation License (PDL).
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