Eclipse dynamic extension API

Contributing items to a toolbar dynamically

New Plug-in Project
Project Name: test.contributing


Add Dependencies
// -- META-INF/MANIFEST.MF --

Manifest-Version: 1.0
Bundle-ManifestVersion: 2
Bundle-Name: Contributing
Bundle-SymbolicName: test.contributing;singleton:=true
Bundle-Version: 1.0.0.qualifier
Bundle-Activator: test.contributing.Activator
Require-Bundle: org.eclipse.ui,
 org.eclipse.ui.ide,
 org.eclipse.core.runtime
Bundle-ActivationPolicy: lazy
Bundle-RequiredExecutionEnvironment: JavaSE-1.6

Add Extensions
// -- plugin.xml --

<?xml version="1.0" encoding="UTF-8"?>
<?eclipse version="3.4"?>
<plugin>
 <extension point="org.eclipse.ui.startup">
   <startup class="test.contributing.Startup">
   </startup>
 </extension>
</plugin>

Add Java Class
// -- /src/test/contributing/Startup.java --

package test.contributing;

import java.io.InputStream;

import org.eclipse.core.internal.registry.ExtensionRegistry;
import org.eclipse.core.runtime.ContributorFactoryOSGi;
import org.eclipse.core.runtime.IContributor;
import org.eclipse.core.runtime.IExtensionRegistry;
import org.eclipse.core.runtime.RegistryFactory;
import org.eclipse.ui.IStartup;
import org.osgi.framework.Bundle;

public class Startup implements IStartup {

  @Override public void earlyStartup() {
    try {
      // use Eclipse Dynamic Extension API
      IExtensionRegistry reg = RegistryFactory.getRegistry();
      Object key = ((ExtensionRegistry) reg).getTemporaryUserToken();
      Bundle bundle = Activator.getDefault().getBundle();
      IContributor contributor = ContributorFactoryOSGi
          .createContributor(bundle);
      InputStream is = Startup.class.getResourceAsStream("dynamically.xml");
      try {
        reg.addContribution(is, contributor, false, null, null, key);
      } finally {
        is.close();
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
}

Add dynamic extension file
// -- src/test/contributing/dynamically.xml --

<?xml version="1.0" encoding="UTF-8"?>
<?eclipse version="3.4"?>
<plugin>
  <extension
     point="org.eclipse.ui.actionSets"
     id="test.contributing.dynamically.actionSets">
   <actionSet
      id="test.contributing.dynamically.actionSet"
      label="Dynamically"
      visible="true">
     <menu
        id="test.contributing.dynamically.menu"
        label="Dynamically">
      <separator
         name="test.contributing.dynamically.separator">
      </separator>
     </menu>
     <action
        id="test.contributing.dynamically.action"
        label="Open Local File"
        class="org.eclipse.ui.internal.ide.actions.OpenLocalFileAction"
        toolbarPath="test.contributing.dynamically.separator">
     </action>
   </actionSet>
  </extension>
</plugin>