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 ArrayList<TextRulerLearnerController> getAvailableControllers() {
    if (learners == null) {
      learners = new ArrayList<TextRulerLearnerController>();
      IExtensionRegistry reg = Platform.getExtensionRegistry();
      if (reg == null)
        return null;
      IConfigurationElement[] extensions = reg
              .getConfigurationElementsFor("org.apache.uima.ruta.textruler.learners");
      for (IConfigurationElement element : extensions) {
        try {
          TextRulerLearnerFactory factory = (TextRulerLearnerFactory) element
                  .createExecutableExtension("class");

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  /**
   * read from plugin registry and parse it.
   */
  public void readRegistry()
  {
    IExtensionRegistry pluginRegistry = Platform.getExtensionRegistry();
    IExtensionPoint point = pluginRegistry.getExtensionPoint(PLUGIN_ID, extensionPointId);
    if (point != null)
    {
      IConfigurationElement[] elements = point.getConfigurationElements();
      for (int i = 0; i < elements.length; i++)
      {

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   * Read from plugin registry and handle the configuration elements that match
   * the spedified elements.
   */
  public void readRegistry()
  {
    IExtensionRegistry pluginRegistry = Platform.getExtensionRegistry();
    IExtensionPoint point = pluginRegistry.getExtensionPoint(PLUGIN_ID, extensionPointId);
    if (point != null)
    {
      IConfigurationElement[] elements = point.getConfigurationElements();
      for (int i = 0; i < elements.length; i++)
      {

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    return (WSITestToolsPlugin) instance;
  }


  /* Computes the list of validators by scanning the platform registry. */
  private BaseValidator[] computeValidators() {
      IExtensionRegistry registry = Platform.getExtensionRegistry();
      IExtensionPoint extensionPoint = registry.getExtensionPoint(
              VALIDATOR_EXT_ID);
      IExtension[] extensions;
      if (extensionPoint != null) {
          extensions = extensionPoint.getExtensions();
      } else {

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  /* Computes the list of supported TAD versions by scanning the platform 
   * registry.  See comment for tadVersions inst var for a description of the
   * return type. */
  private String[][] computeTADVersions() {
      IExtensionRegistry registry = Platform.getExtensionRegistry();
      IExtensionPoint extensionPoint = registry.getExtensionPoint(
              TAD_VERSION_EXT_ID);
      IExtension[] extensions;
      if (extensionPoint != null) {
          extensions = extensionPoint.getExtensions();
      } else {

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  }
  
  /* Computes the list of artifact types by scanning the platform registry. */
  private String[] computeReportArtifactTypes() 
  {
    IExtensionRegistry registry = Platform.getExtensionRegistry();
    IExtensionPoint extensionPoint = registry.getExtensionPoint(REPORT_ARTIFACT_TYPES_EXT_ID);
    IExtension[] extensions;
    if (extensionPoint != null) {
      extensions = extensionPoint.getExtensions();
    } else {
      extensions = new IExtension[0];

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  /**
   * read from plugin registry and parse it.
   */
  public void readRegistry()
  {
    IExtensionRegistry pluginRegistry = Platform.getExtensionRegistry();
    IExtensionPoint point = pluginRegistry.getExtensionPoint(PLUGIN_ID, EXTENSION_POINT_ID);
    if (point != null)
    {
      IConfigurationElement[] elements = point.getConfigurationElements();
      for (int i = 0; i < elements.length; i++)
      {

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  /**
   * read from plugin registry and parse it.
   */
  public void readRegistry()
  {
    IExtensionRegistry pluginRegistry = Platform.getExtensionRegistry();
    IExtensionPoint point = pluginRegistry.getExtensionPoint(PLUGIN_ID, EXTENSION_POINT_ID);
    if (point != null)
    {
      IConfigurationElement[] elements = point.getConfigurationElements();
      for (int i = 0; i < elements.length; i++)
      {

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  private String[] noValidationNatureIds;
  
  public String[] getNoValidationNatureId(){
    if(noValidationNatureIds==null){
      ArrayList list = new ArrayList();
      IExtensionRegistry registry = Platform.getExtensionRegistry();
      IExtensionPoint point = registry.getExtensionPoint(getPluginId() + ".noValidationNatures");
      IExtension[] extensions = point.getExtensions();
      for(int i=0;i<extensions.length;i++){
        IConfigurationElement[] elements = extensions[i].getConfigurationElements();
        for (int j = 0; j < elements.length; j++) {
          if ("noValidationNature".equals(elements[j].getName())) {

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   */
  public IFileAssistProcessor[] getFileAssistProcessors(){
    try {
//      if(fileAssists==null){
        ArrayList list = new ArrayList();
        IExtensionRegistry registry = Platform.getExtensionRegistry();
        IExtensionPoint point = registry.getExtensionPoint(getPluginId() + ".fileAssistProcessor");
        IExtension[] extensions = point.getExtensions();
        for(int i=0;i<extensions.length;i++){
          IConfigurationElement[] elements = extensions[i].getConfigurationElements();
          for (int j = 0; j < elements.length; j++) {
            IFileAssistProcessor assist = (IFileAssistProcessor) elements[j].createExecutableExtension("class");

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