XUnoTunnel

OpenOffice.org Developer's Guide

Writing UNO Components

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• Required Files
• Using UNOIDL to Specify New Components

• Writing the Specification

• Preprocessing
• Grouping Definitions in Modules
• Simple Types
• Defining an Interface
• Defining a Service
• Defining a Sequence
• Defining a Struct
• Defining an Exception
• Predefining Values
• Using Comments
• Singleton
• Reserved Types
• Published Entities

• Generating Source Code from UNOIDL Definitions

• Component Architecture
• Core Interfaces to Implement

• XInterface
• XTypeProvider
• XServiceInfo
• XWeak
• XComponent
• XInitialization
• XMain
• XAggregation
• XUnoTunnel

• Simple Component in Java

• Class Definition with Helper Class
• Implementing Your Own Interfaces
• Providing a Single Factory Using a Helper Method
• Write Registration Info Using a Helper Method
• Implementing without Helpers
• Storing the Service Manager for Further Use
• Create Instance with Arguments
• Possible Structures for Java Components
• Running and Debugging Java Components

• Register Component File
• Make Registration Available to OpenOffice.org
• Test the Registration
• Debugging
• The Java Environment in OpenOffice.org
• Troubleshooting

• C++ Component

• Class Definition with Helper Template Classes
• Implementing your own Interfaces
• Providing a Single Factory Using a Helper Method
• Write Registration Info Using a Helper Method
• Provide Implementation Environment
• Implementing without Helpers
• Storing the Service Manager for Further Use
• Create Instance with Arguments
• Multiple Components in One Dynamic Link Library
• Building and Testing C++ Components

• Integrating Components into OpenOffice.org

• Protocol Handler

• Implementation
• Configuration
• Installation

• Jobs

• Execution Environment
• Implementation
• Initialization
• Returning Results
• Configuration
• Installation
• Using the vnd.sun.star.jobs: URL Schema
• List of Supported Events

• Add-Ons

• Guidelines
• Configuration

• Menus
• Toolbars
• Images for Toolbars and Menus
• Help Integration

• Installation

• Disable Commands
• Intercepting Context Menus

• File Naming Conventions
• Deployment Options for Components

• Command Line Registry Tools
• Manual Component Installation
• Bootstrapping a Service Manager
• Special Service Manager Configurations

• The UNO Executable

• Standalone Use Case
• Server Use Case
• Using the UNO Executable

• Accessing Dialogs

• Assigning Component Methods to Control Events
• Using Dialogs in Components

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The com.sun.star.lang.XUnoTunnel interface allows access to the this pointer of an object. This interface is used to cast a UNO interface that is coming back to its implementation class through a UNO method. Using this interface is a result of an unsatisfactory interface design, because it indicates that some functionality only works when non-UNO functions are used. In general, these objects cannot be replaced by a different implementation, because they undermine the general UNO interface concept. This interface can be understood as admittance to an already existing code that cannot be split into UNO components easily. If designing new services, do not use this interface.

  interface XUnoTunnel: com::sun::star::uno::XInterface
  { 
      hyper getSomething( [in] sequence< byte > aIdentifier );
  };

The byte sequence contains an identifier that both the caller and implementer must know. The implementer returns the this pointer of the object if the byte sequence is equal to the byte sequence previously stored in a static variable. The byte sequence is usually generated once per process per implementation.

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