Examples of org.eclipse.core.runtime.IExtension

org.eclipse.core.runtime.IExtension
An extension declared in a plug-in. All information is obtained from the declaring plug-in's manifest (plugin.xml) file.
These registry objects 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 except {@link #isValid()} will throw {@link InvalidRegistryObjectException}. For extension objects, the most common case is code in a plug-in dealing with extensions contributed to one of the extension points it declares. 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 when accessing the extension objects because they become invalid if the contributing plug-in is removed. Similarly, tools that analyze or display the extension registry are vulnerable. Client code can pre-test for invalid objects by calling {@link #isValid()}, which never throws this exception. However, pre-tests are usually not sufficient because of the possibility of the extension 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.
This interface can be used without OSGi running.
This interface is not intended to be implemented by clients.

                .getExtension(EXTENSION_ID);
        IExtension[] extensions = extensionPoint.getExtensions();


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


            for (int j = 0; j < configElements.length; j++)
            {
                final IConfigurationElement element = configElements[j];

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  protected void readRegistry() {
    try {
      IExtensionPoint point = Platform.getExtensionRegistry().getExtensionPoint(JSFCorePlugin.PLUGIN_ID, ext_pt_id);
      IExtension[] extensions = point.getExtensions();
      for (int i=0;i < extensions.length;i++){
        IExtension ext = extensions[i];
        for (int j=0;j < ext.getConfigurationElements().length;j++){
          final String bundleId = ext.getConfigurationElements()[j].getContributor().getName();
          final String id = ext.getConfigurationElements()[j].getAttribute("id"); //$NON-NLS-1$
          String klass = ext.getConfigurationElements()[j].getAttribute("class"); //$NON-NLS-1$
          final String runtimeType = ext.getConfigurationElements()[j].getAttribute("runtime-type"); //$NON-NLS-1$
          if (klass == null || klass.trim().equals("")){ //$NON-NLS-1$
            klass = getDefaultClassName();
          }
          registerType(bundleId, id, klass, runtimeType);
        }

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  protected void readRegistry() {
    try {
      IExtensionPoint point = Platform.getExtensionRegistry().getExtensionPoint(JSFCorePlugin.PLUGIN_ID, EXTPTID);
      IExtension[] extensions = point.getExtensions();
      for (int i=0;i < extensions.length;i++){
        IExtension ext = extensions[i];
        for (int j=0;j < ext.getConfigurationElements().length;j++){
          final String bundleId = ext.getConfigurationElements()[j].getContributor().getName();
          final String id = ext.getConfigurationElements()[j].getAttribute("typeid"); //$NON-NLS-1$
          final String klass = ext.getConfigurationElements()[j].getAttribute("class"); //$NON-NLS-1$
          registerFeature(bundleId, id, klass);
        }
      }
    } catch (InvalidRegistryObjectException e) {
      JSFCorePlugin.log(e, "Unable to read " + JSFCorePlugin.PLUGIN_ID + EXTPTID + " registry"); //$NON-NLS-1$ //$NON-NLS-2$

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  /**
   * Logs the error in the workbench log using the provided text and the
   * information in the configuration element.
   */
  protected void logError(IConfigurationElement element, String text) {
    IExtension extension = element.getDeclaringExtension();
    StringBuffer buf = new StringBuffer();
    buf.append("Plugin " + extension.getNamespace() + ", extension " + extension.getExtensionPointUniqueIdentifier()); //$NON-NLS-2$//$NON-NLS-1$
    buf.append("\n" + text); //$NON-NLS-1$
    Logger.log(Logger.ERROR, buf.toString());
  }

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  private void loadJSFLibraryExtensions() {
    try {
      IExtensionPoint point = Platform.getExtensionRegistry().getExtensionPoint(JSFCorePlugin.PLUGIN_ID, LIB_EXT_PT);
      IExtension[] extensions = point.getExtensions();
      for (int i=0;i < extensions.length;i++){
        IExtension ext = extensions[i];
        for (int j=0;j < ext.getConfigurationElements().length;j++){
          PluginProvidedJSFLibraryCreationHelper2 newLibCreator = new PluginProvidedJSFLibraryCreationHelper2(ext.getConfigurationElements()[j]);            
          JSFLibrary newLib = newLibCreator.create();
          
          /**
           * Additional check on if a plug-in contributes jsflibraries is an expanded folder.
           * Fix related to bug 144954.

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  private void loadDeprecatedJSFLibraryExtensions() {
    try {
      IExtensionPoint point = Platform.getExtensionRegistry().getExtensionPoint(JSFCorePlugin.PLUGIN_ID, OLD_LIB_EXT_PT);
      IExtension[] extensions = point.getExtensions();
      for (int i=0;i < extensions.length;i++){
        IExtension ext = extensions[i];
        for (int j=0;j < ext.getConfigurationElements().length;j++){
          PluginProvidedJSFLibraryCreationHelper newLibCreator = new PluginProvidedJSFLibraryCreationHelper(ext.getConfigurationElements()[j]);            
          JSFLibrary newLib = newLibCreator.create();
          
          /**
           * Additional check on if a plug-in contributes jsflibraries is an expanded folder.
           * Fix related to bug 144954.

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      // A single plugin may extend the extension point more than once,
      // although it's not recommended.
      IConfigurationElement bestTranslator = null;
      IExtension[] extensions = extensionPoint.getExtensions();
      for (int curExtension = 0; curExtension < extensions.length; curExtension++) {
        IExtension extension = extensions[curExtension];


        IConfigurationElement[] translators = extension.getConfigurationElements();
        for (int curTranslator = 0; curTranslator < translators.length; curTranslator++) {


          IConfigurationElement elTranslator = translators[curTranslator];


          if (!EL_TRANSLATOR_EXTENSION_NAME.equals(elTranslator.getName())) { // -

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  /**
   * Logs the error in the workbench log using the provided text and the
   * information in the configuration element.
   */
  protected void logError(IConfigurationElement element, String text) {
    IExtension extension = element.getDeclaringExtension();
    StringBuffer buf = new StringBuffer();
    buf.append("Plugin " + extension.getNamespace() + ", extension " + extension.getExtensionPointUniqueIdentifier()); //$NON-NLS-2$//$NON-NLS-1$
    buf.append("\n" + text); //$NON-NLS-1$
    Logger.log(Logger.ERROR, buf.toString());
  }

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        .getExtensionPoint(PDPlugin.getPluginId(),
            IJMTConstants.EXTENSION_POINT_PAGEDESIGNER);
    IExtension[] extensions = extensionPoint.getExtensions();


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


      for (int j = 0; j < linkHandlers.length; j++) {
        if (linkHandlers[j].getName()
            .equals(IJMTConstants.LINK_CREATOR)) {

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  private void loadJSFLibraryExtensions() {
    try {
      IExtensionPoint point = Platform.getExtensionRegistry().getExtensionPoint(TapestryCorePlugin.PLUGIN_ID, LIB_EXT_PT);
      IExtension[] extensions = point.getExtensions();
      for (int i=0;i < extensions.length;i++){
        IExtension ext = extensions[i];
        for (int j=0;j < ext.getConfigurationElements().length;j++){
          PluginProvidedTapestryLibraryCreationHelper2 newLibCreator = new PluginProvidedTapestryLibraryCreationHelper2(ext.getConfigurationElements()[j]);            
          TapestryLibrary newLib = newLibCreator.create();
          
          /**
           * Additional check on if a plug-in contributes jsflibraries is an expanded folder.
           * Fix related to bug 144954.

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