package com.atlassian.plugins.rest.module.template;
   
   import com.atlassian.templaterenderer.velocity.one.six.VelocityTemplateRenderer;
   import com.sun.jersey.spi.template.TemplateProcessor;
   import org.osgi.framework.Bundle;
   import org.osgi.framework.ServiceFactory;
   import org.osgi.framework.ServiceRegistration;
   import org.osgi.util.tracker.ServiceTracker;
   
  import java.io.IOException;
  import java.io.OutputStream;
  
  /**
   * OSGi Service Factory for creating velocity template processors, with the right bundle context.
   */
  //////////////////
  // TODO The TemplateProcessor implementation is a workaround for a Spring DM bug that is fixed in
  // version 1.2.0.  It can be removed once the plugins system has upgraded to 1.2.0
  /////////////////
  public class VelocityTemplateProcessorServiceFactory implements ServiceFactory, TemplateProcessor {
      public Object getService(Bundle bundle, ServiceRegistration serviceRegistration) {
          // Create a ServiceTracker for the template renderer.  This is needed because the template
          // renderer may not yet be started, or it may come up or go down
          ServiceTracker serviceTracker = new ServiceTracker(bundle.getBundleContext(), VelocityTemplateRenderer.class.getName(), null);
          serviceTracker.open();
          return new VelocityTemplateProcessor(serviceTracker);
      }
  
      public void ungetService(Bundle bundle, ServiceRegistration serviceRegistration, Object service) {
          ((VelocityTemplateProcessor) service).closeTemplateRendererServiceTracker();
      }
  
      public String resolve(String s) {
          throw new UnsupportedOperationException();
      }
  
      public void writeTo(String s, Object o, OutputStream outputStream) throws IOException {
          throw new UnsupportedOperationException();
      }
  }