Examples of org.eclipse.core.runtime.IExtensionRegistry

org.eclipse.core.runtime.IExtensionRegistry
The extension registry holds the master list of all discovered namespaces, extension points and extensions.
The extension registry can be queried, by name, for extension points and extensions.

The various objects that describe the contents of the extension registry ( {@link IExtensionPoint}, {@link IExtension}, and {@link IConfigurationElement}) are intended for relatively short-term use. Clients that deal with these objects must be aware that they may become invalid if the declaring plug-in is updated or uninstalled. If this happens, all methods on these object except isValid() will throw {@link org.eclipse.core.runtime.InvalidRegistryObjectException}. Code in a plug-in that has declared that it is not dynamic aware (or not declared anything) can safely ignore this issue, since the registry would not be modified while it is active. However, code in a plug-in that declares that it is dynamic aware must be careful if it accesses extension registry objects, because it's at risk if plug-in are removed. Similarly, tools that analyze or display the extension registry are vulnerable. Client code can pre-test for invalid objects by calling isValid(), which never throws this exception. However, pre-tests are usually not sufficient because of the possibility of the extension registry object becoming invalid as a result of a concurrent activity. At-risk clients must treat InvalidRegistryObjectException as if it were a checked exception. Also, such clients should probably register a listener with the extension registry so that they receive notification of any changes to the registry.

Extensions and extension points are declared by generic entities called namespaces. The only fact known about namespaces is that they have unique string-based identifiers. One example of a namespace is a plug-in, for which the namespace id is the plug-in id.
This interface can be used without OSGi running.
This interface is not intended to be implemented by clients.
@since 3.0

     */
    private OtpErlangBinary getDebuggerBeam(final String module) {
        final String beamname = module + ".beam";
        final Bundle bundle = Platform.getBundle("org.erlide.kernel.debugger");


        final IExtensionRegistry reg = RegistryFactory.getRegistry();
        final IConfigurationElement[] els = reg.getConfigurationElementsFor(
                BackendActivator.PLUGIN_ID, "codepath");


        // TODO: this code assumes that the debugged debugTarget and the
        // erlide-plugin uses the same Erlang version, how can we escape this?

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  private void readRegistry() {
    readRegistry(EXTENSION_POINT_ID);
  }


  private void readRegistry(String extensionPointId) {
    IExtensionRegistry pluginRegistry = Platform.getExtensionRegistry();
    IExtensionPoint point = pluginRegistry.getExtensionPoint(XMLUIPlugin.ID, extensionPointId);
    if (point != null) {
      IConfigurationElement[] elements = point.getConfigurationElements();
      for (int i = 0; i < elements.length; i++) {
        readElement(elements[i]);
      }

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    private static final long serialVersionUID = ExtensionPointList.class.hashCode();
    /**
     * Construct <code>ExtensionPointIterator</code>.
     */
    private ExtensionPointList( String xpid ) {
        IExtensionRegistry registry = Platform.getExtensionRegistry();
        IExtensionPoint extensionPoint = registry.getExtensionPoint(xpid);
        if (extensionPoint == null)
            return;


        // For each extension ...
        for( IExtension extension : extensionPoint.getExtensions() ) {

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     * @param plugin plugin processing this extention point
     * @param xpid The id of the ExtensionPoint for which the extensions are to be processed
     * @param processor The object that wishes to process the extension for the ExtensionPoint
     */
    public static void process( Plugin plugin, String xpid, ExtensionPointProcessor processor ) {
        IExtensionRegistry registry = Platform.getExtensionRegistry();
        IExtensionPoint extensionPoint = registry.getExtensionPoint(xpid);
        if (extensionPoint == null)
            return;
        IExtension[] extensions = extensionPoint.getExtensions();


        // For each extension ...

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     * @param xpid
     * @param itemCreator Used to process extention points into items for a list
     * @return List
     */
    public static List list( String xpid, ExtensionPointItemCreator itemCreator ) {
        IExtensionRegistry registry = Platform.getExtensionRegistry();
        IExtensionPoint extensionPoint = registry.getExtensionPoint(xpid);
        if (extensionPoint == null) {
            return Collections.EMPTY_LIST;
        }
        IExtension[] extensions = extensionPoint.getExtensions();
        List<Object> list = new ArrayList<Object>();

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            graphicalViewer.createControl(composite);
            graphicalViewer.getControl().setBackground(ColorConstants.listBackground);
            graphicalViewer.setRootEditPart(new ScalableRootEditPart());
            IJavaProject javaProject = getJavaProject(projectName);
            
            IExtensionRegistry reg = Platform.getExtensionRegistry();
            IConfigurationElement[] extensions =
                reg.getConfigurationElementsFor(
                    "org.drools.eclipse.processExtension");
            for (IConfigurationElement element: extensions) {
                try {
                    ProcessExtension processExtension = (ProcessExtension)
                        element.createExecutableExtension("className");

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     * 
     * @param mng the manager to read into
     */
    public void readPopupContributors(ObjectActionContributorManager mng) {
        setManager(mng);
        IExtensionRegistry registry = Platform.getExtensionRegistry();
        readRegistry(registry, PlatformUI.PLUGIN_ID,
                IWorkbenchRegistryConstants.PL_POPUP_MENU);
    }

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     * @return the viewer drop adapter
     */
    protected static IDropActionDelegate getPluginAdapter(
            PluginTransferData data) throws CoreException {


        IExtensionRegistry registry = Platform.getExtensionRegistry();
        String adapterName = data.getExtensionId();
        IExtensionPoint xpt = registry.getExtensionPoint(PlatformUI.PLUGIN_ID,
                IWorkbenchRegistryConstants.PL_DROP_ACTIONS);
        IExtension[] extensions = xpt.getExtensions();
        for (int i = 0; i < extensions.length; i++) {
            IConfigurationElement[] configs = extensions[i]
                    .getConfigurationElements();

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   */
  protected final void read() {
    super.read();


    // Create the extension registry mementos.
    final IExtensionRegistry registry = Platform.getExtensionRegistry();
    int commandDefinitionCount = 0;
    int handlerDefinitionCount = 0;
    int handlerSubmissionCount = 0;
    final IConfigurationElement[][] indexedConfigurationElements = new IConfigurationElement[3][];


    // Sort the commands extension point based on element name.
    final IConfigurationElement[] commandsExtensionPoint = registry
        .getConfigurationElementsFor(EXTENSION_COMMANDS);
    for (int i = 0; i < commandsExtensionPoint.length; i++) {
      final IConfigurationElement configurationElement = commandsExtensionPoint[i];
      final String name = configurationElement.getName();


      // Check if it is a handler submission or a command definition.
      if (TAG_HANDLER_SUBMISSION.equals(name)) {
        addElementToIndexedArray(configurationElement,
            indexedConfigurationElements,
            INDEX_HANDLER_SUBMISSIONS, handlerSubmissionCount++);
      } else if (TAG_COMMAND.equals(name)) {
        addElementToIndexedArray(configurationElement,
            indexedConfigurationElements,
            INDEX_COMMAND_DEFINITIONS, commandDefinitionCount++);
      }
    }


    // Sort the handler extension point based on element name.
    final IConfigurationElement[] handlersExtensionPoint = registry
        .getConfigurationElementsFor(EXTENSION_HANDLERS);
    for (int i = 0; i < handlersExtensionPoint.length; i++) {
      final IConfigurationElement configurationElement = handlersExtensionPoint[i];
      final String name = configurationElement.getName();

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  public final void read() {
    clear();
    LegacyActionPersistence.super.read();


    // Create the extension registry mementos.
    final IExtensionRegistry registry = Platform.getExtensionRegistry();
    int actionSetCount = 0;
    int editorContributionCount = 0;
    int objectContributionCount = 0;
    int viewContributionCount = 0;
    int viewerContributionCount = 0;
    final IConfigurationElement[][] indexedConfigurationElements = new IConfigurationElement[5][];


    // Sort the actionSets extension point.
    final IConfigurationElement[] actionSetsExtensionPoint = registry
        .getConfigurationElementsFor(EXTENSION_ACTION_SETS);
    for (int i = 0; i < actionSetsExtensionPoint.length; i++) {
      final IConfigurationElement element = actionSetsExtensionPoint[i];
      final String name = element.getName();
      if (TAG_ACTION_SET.equals(name)) {
        addElementToIndexedArray(element, indexedConfigurationElements,
            INDEX_ACTION_SETS, actionSetCount++);
      }
    }


    // Sort the editorActions extension point.
    final IConfigurationElement[] editorActionsExtensionPoint = registry
        .getConfigurationElementsFor(EXTENSION_EDITOR_ACTIONS);
    for (int i = 0; i < editorActionsExtensionPoint.length; i++) {
      final IConfigurationElement element = editorActionsExtensionPoint[i];
      final String name = element.getName();
      if (TAG_EDITOR_CONTRIBUTION.equals(name)) {
        addElementToIndexedArray(element, indexedConfigurationElements,
            INDEX_EDITOR_CONTRIBUTIONS, editorContributionCount++);
      }
    }


    // Sort the popupMenus extension point.
    final IConfigurationElement[] popupMenusExtensionPoint = registry
        .getConfigurationElementsFor(EXTENSION_POPUP_MENUS);
    for (int i = 0; i < popupMenusExtensionPoint.length; i++) {
      final IConfigurationElement element = popupMenusExtensionPoint[i];
      final String name = element.getName();
      if (TAG_OBJECT_CONTRIBUTION.equals(name)) {
        addElementToIndexedArray(element, indexedConfigurationElements,
            INDEX_OBJECT_CONTRIBUTIONS, objectContributionCount++);
      } else if (TAG_VIEWER_CONTRIBUTION.equals(name)) {
        addElementToIndexedArray(element, indexedConfigurationElements,
            INDEX_VIEWER_CONTRIBUTIONS, viewerContributionCount++);
      }
    }


    // Sort the viewActions extension point.
    final IConfigurationElement[] viewActionsExtensionPoint = registry
        .getConfigurationElementsFor(EXTENSION_VIEW_ACTIONS);
    for (int i = 0; i < viewActionsExtensionPoint.length; i++) {
      final IConfigurationElement element = viewActionsExtensionPoint[i];
      final String name = element.getName();
      if (TAG_VIEW_CONTRIBUTION.equals(name)) {

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