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

     */
    public static Collection<ValueEditorExtension> getValueEditorExtensions()
    {
        Collection<ValueEditorExtension> valueEditorExtensions = new ArrayList<ValueEditorExtension>();


        IExtensionRegistry registry = Platform.getExtensionRegistry();
        IExtensionPoint extensionPoint = registry.getExtensionPoint( EXTENSION_POINT );
        IConfigurationElement[] members = extensionPoint.getConfigurationElements();


        // For each extension:
        for ( int m = 0; m < members.length; m++ )
        {

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    {
        if ( jndiLoggers == null )
        {
            jndiLoggers = new ArrayList<IJndiLogger>();


            IExtensionRegistry registry = Platform.getExtensionRegistry();
            IExtensionPoint extensionPoint = registry.getExtensionPoint( getPluginProperties().getString(
                "ExtensionPoint_JndiLogger_id" ) ); //$NON-NLS-1$
            IConfigurationElement[] members = extensionPoint.getConfigurationElements();
            for ( IConfigurationElement member : members )
            {
                try

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    {
        if ( connectionListeners == null )
        {
            connectionListeners = new ArrayList<IConnectionListener>();


            IExtensionRegistry registry = Platform.getExtensionRegistry();
            IExtensionPoint extensionPoint = registry.getExtensionPoint( getPluginProperties().getString(
                "ExtensionPoint_ConnectionListener_id" ) ); //$NON-NLS-1$
            IConfigurationElement[] members = extensionPoint.getConfigurationElements();
            for ( IConfigurationElement member : members )
            {
                try

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     * 
     * @return the connection parameter pages
     */
    public static ConnectionParameterPage[] getConnectionParameterPages()
    {
        IExtensionRegistry registry = Platform.getExtensionRegistry();
        IExtensionPoint extensionPoint = registry.getExtensionPoint( ConnectionUIPlugin.getDefault()
            .getPluginProperties().getString( "ExtensionPoint_ConnectionParameterPages_id" ) ); //$NON-NLS-1$
        IConfigurationElement[] members = extensionPoint.getConfigurationElements();
        final Map<String, ConnectionParameterPage> pageMap = new HashMap<String, ConnectionParameterPage>();


        // For each extension: instantiate the page

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     */
    public List<AdapterFactory> getAdapterFactories() {
        if (adapterFactories == null) {
            adapterFactories = new ArrayList<AdapterFactory>();


            IExtensionRegistry registry = Platform.getExtensionRegistry();
            IExtensionPoint extensionPoint = registry.getExtensionPoint(ADAPTER_FACTORIES_ID);
            IExtension[] extensions = extensionPoint.getExtensions();


            for( int i = 0; i < extensions.length; i++ ) {
                IConfigurationElement[] elements = extensions[i].getConfigurationElements();

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     */
    public synchronized static List<ExpressionViewerFactory> factoryList() {
        if (factoryList == null) {
            ArrayList<ExpressionViewerFactory> list = new ArrayList<ExpressionViewerFactory>();


            IExtensionRegistry registery = Platform.getExtensionRegistry();
            IExtensionPoint extensionPoint = registery.getExtensionPoint(FILTER_VIEWER_EXTENSION);


            IConfigurationElement[] configurationElements = extensionPoint
                    .getConfigurationElements();
            for (IConfigurationElement configuration : configurationElements) {
                if ("expressionViewer".equals(configuration.getName())) {

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 * @since 1.2.0
 */
public class PlatformExample {
    void processingExtensionPointByHand() {
        String xpid = "org.locationtech.udig.project.ui.tool";
        IExtensionRegistry registry = Platform.getExtensionRegistry();
        IExtensionPoint extensionPoint = registry.getExtensionPoint(xpid);
        if (extensionPoint == null) {
            throw new NullPointerException("Could not find extensionPoint:" + xpid);
        }
        for( IExtension extension : extensionPoint.getExtensions() ) {
            for( IConfigurationElement element : extension.getConfigurationElements() ) {

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    private synchronized static List<FilterViewerFactory> filterViewerFactoryList() {
        if (filterViewerFactoryList == null) {
            ArrayList<FilterViewerFactory> list = new ArrayList<FilterViewerFactory>();
            
            IExtensionRegistry registery = Platform.getExtensionRegistry();
            IExtensionPoint extensionPoint = registery.getExtensionPoint(FILTER_VIEWER_EXTENSION);
            
            IConfigurationElement[] configurationElements = extensionPoint.getConfigurationElements();
            for (IConfigurationElement configuration : configurationElements) {
                if ("filterViewer".equals(configuration.getName())) {
                    try {

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  public EclipsePlatformFactory() {
  }
  
  public Platform createPlatform() {
    // Look if someone implemented an extension point to retrive the platform
        IExtensionRegistry reg = org.eclipse.core.runtime.Platform.getExtensionRegistry();
        if (reg != null) {
            IConfigurationElement[] elt = reg.getConfigurationElementsFor("com.ibm.commons.PlatformFactory"); // $NON-NLS-1$
            for( int i=0; i<elt.length; i++ ) {
                if( "platformFactory".equalsIgnoreCase(elt[i].getName()) ) { // $NON-NLS-1$
                    try {
                        Object o = elt[i].createExecutableExtension("class"); // $NON-NLS-1$
                        IPlatformFactory factory = (IPlatformFactory)o;

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    private static class EclipseProvider extends JavaServiceProvider {
        public void findInitializer(ClassLoader loader, List<Object> initializers, String serviceType) {
          // Load the global providers, from the platform
            try {
                IExtensionRegistry reg = org.eclipse.core.runtime.Platform.getExtensionRegistry();
                if (reg != null) {
                  // Services defined individually
                    // Look if someone implemented an extension point to retrieve the platform
                    IConfigurationElement[] elt = reg.getConfigurationElementsFor("com.ibm.commons.Extension"); // $NON-NLS-1$
                    for( int i=0; i<elt.length; i++ ) {
                        if( "service".equalsIgnoreCase(elt[i].getName()) ) { // $NON-NLS-1$
                            String type = elt[i].getAttribute("type"); //$NON-NLS-1$
                            if(StringUtil.equals(type, serviceType)) {
                                try {
                                    Object o = elt[i].createExecutableExtension("class"); // $NON-NLS-1$
                                    initializers.add(o);
                                } catch(Throwable ex) {
                                    logCouldNotCreateContribution(ex, elt[i], type);
                                }
                            }
                        }
                    }
                // Services read from META-INF/services
                //
                Set<URL> urls = new HashSet<URL>();
                    elt = reg.getConfigurationElementsFor("com.ibm.commons.ExtensionBundle");  // $NON-NLS-1$
                    for( int i=0; i<elt.length; i++ ) {
                        try {
                            OSGiExtensionService o = (OSGiExtensionService)elt[i].createExecutableExtension("class");
                            Bundle bundle = o.getBundle();
                            if(bundle!=null) {

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