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.

    public ProducerDescriptor(IConfigurationElement config) {
      this.config = config;
    }


    public boolean matches(String refId) {
      IExtension ex = config.getDeclaringExtension();
      String id = ex.getUniqueIdentifier();
      return id != null && id.equals(refId);
    }

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        }
      }
      if (addNew) {
        IExtensionRegistry reg = Platform.getExtensionRegistry();
        IExtensionPoint extensionPoint = reg.getExtensionPoint("org.cfeclipse.cfeclipsecall.core.openhandler");
        IExtension extensions[] = extensionPoint.getExtensions();
        for (int i = 0; i < extensions.length; i++) {
          IExtension ext = extensions[i];
          IConfigurationElement[] elements = ext.getConfigurationElements();
          for (int j = 0; j < elements.length; j++) {
            IConfigurationElement el = elements[j];
            String clz = el.getAttribute("handlerClass");
            if (clz != null) {
              try {

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      }
      if (addNew) {
        CFECallPlugin.log(IStatus.INFO, "initializing extensions.");
        IExtensionRegistry reg = Platform.getExtensionRegistry();
        IExtensionPoint extensionPoint = reg.getExtensionPoint("org.cfeclipse.cfeclipsecall.core.openhandler");
        IExtension extensions[] = extensionPoint.getExtensions();
        for (int i = 0; i < extensions.length; i++) {
          IExtension ext = extensions[i];
          IConfigurationElement[] elements = ext.getConfigurationElements();
          for (int j = 0; j < elements.length; j++) {
            IConfigurationElement el = elements[j];
            String clz = el.getAttribute("handlerClass");
            if (clz != null) {
              try {

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  private static Map<String, Object> collectAttributes(final IConfigurationElement config) {
    final Map<String, Object> map = new HashMap<String, Object>();


    try {
      final IExtension extension = config.getDeclaringExtension();


      // use @ to avoid conflicting with attributes in the XML
      safePut(map, "@id", extension.getUniqueIdentifier());
      safePut(map, "@label", extension.getLabel());
      safePut(map, "@contributor", config.getContributor());
      safePut(map, "@namespace", config.getNamespaceIdentifier());
      safePut(map, "@point", extension.getExtensionPointUniqueIdentifier());


      // similarly use () to avoid conflicts
      safePut(map, "name()", config.getName());
      safePut(map, "text()", config.getValue());

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  private Object getApplication(String[] args) throws CoreException {
    // Find the name of the application as specified by the PDE JUnit launcher.
    // If no application is specified, the 3.0 default workbench application
    // is returned.
    String applicationToRun = getApplicationToRun(args);
    IExtension extension = Platform.getExtensionRegistry().getExtension(Platform.PI_RUNTIME, Platform.PT_APPLICATIONS,
        applicationToRun);


    Assert.isNotNull(extension, "Could not find IExtension for application: " + applicationToRun);


    // If the extension does not have the correct grammar, return null.
    // Otherwise, return the application object.
    IConfigurationElement[] elements = extension.getConfigurationElements();
    if (elements.length > 0) {
      IConfigurationElement[] runs = elements[0].getChildren("run"); //$NON-NLS-1$
      if (runs.length > 0) {
        Object runnable = runs[0].createExecutableExtension("class"); //$NON-NLS-1$
        if (runnable instanceof IApplication)

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    // Find the name of the application as specified by the PDE JUnit launcher.
    // If no application is specified, the 3.0 default workbench application
    // is returned.
    String applicationToRun = getApplicationToRun(args);
    
    IExtension extension = Platform.getExtensionRegistry().getExtension(Platform.PI_RUNTIME, Platform.PT_APPLICATIONS,
        applicationToRun);


    Assert.isNotNull(extension, "Could not find IExtension for application: " + applicationToRun);


    // If the extension does not have the correct grammar, return null.
    // Otherwise, return the application object.
    IConfigurationElement[] elements = extension.getConfigurationElements();
    if (elements.length > 0) {
      IConfigurationElement[] runs = elements[0].getChildren("run"); //$NON-NLS-1$
      if (runs.length > 0) {
        Object runnable = runs[0].createExecutableExtension("class"); //$NON-NLS-1$
        if (runnable instanceof IApplication)

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    // Find the name of the application as specified by the PDE JUnit launcher.
    // If no application is specified, the 3.0 default workbench application
    // is returned.
    String applicationToRun = getApplicationToRun(args);


    IExtension extension = Platform.getExtensionRegistry().getExtension(Platform.PI_RUNTIME, Platform.PT_APPLICATIONS,
        applicationToRun);


    Assert.isNotNull(extension, "Could not find IExtension for application: " + applicationToRun);


    // If the extension does not have the correct grammar, return null.
    // Otherwise, return the application object.
    IConfigurationElement[] elements = extension.getConfigurationElements();
    if (elements.length > 0) {
      IConfigurationElement[] runs = elements[0].getChildren("run"); //$NON-NLS-1$
      if (runs.length > 0) {
        Object runnable = runs[0].createExecutableExtension("class"); //$NON-NLS-1$
        if (runnable instanceof IApplication)

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            IExtension[] extensions = ExtensionHelper.getExtensions("org.eclipse.core.expressions.propertyTesters");
            // For each extension ...
            propertyTester = new ArrayList<PropertyTester>();
            propertyTesters.put(name, propertyTester);
            for (int i = 0; i < extensions.length; i++) {
                IExtension extension = extensions[i];
                IConfigurationElement[] elements = extension.getConfigurationElements();
                // For each member of the extension ...
                for (int j = 0; j < elements.length; j++) {
                    IConfigurationElement element = elements[j];
                    //Any property tester that's declared in "org.python.pydev.customizations"
                    //is considered to be an object that provides the objectState for an IActionFilter.

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        {
            ValueEditorExtension proxy = new ValueEditorExtension();
            valueEditorProxies.add( proxy );


            IConfigurationElement member = members[m];
            IExtension extension = member.getDeclaringExtension();
            String extendingPluginId = extension.getNamespaceIdentifier();


            proxy.member = member;
            proxy.name = member.getAttribute( "name" );
            String iconPath = member.getAttribute( "icon" );
            proxy.icon = AbstractUIPlugin.imageDescriptorFromPlugin( extendingPluginId, iconPath );

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            IExtension[] extensions = extensionPoint.getExtensions();
            if ( extensions != null )
            {
                for ( int i = 0; i < extensions.length; i++ )
                {
                    IExtension extension = extensions[i];
                    IConfigurationElement[] elements = extension.getConfigurationElements();
                    for ( int j = 0; j < elements.length; j++ )
                    {
                        IConfigurationElement element = elements[j];
                        if ( element.getName().equals( "perspective" ) )
                        {

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