package org.junit.internal.requests;
   
   import org.junit.internal.runners.ErrorReportingRunner;
   import org.junit.runner.Request;
   import org.junit.runner.Runner;
   import org.junit.runner.manipulation.Filter;
   import org.junit.runner.manipulation.NoTestsRemainException;
   
   /**
   * A filtered {@link Request}.
   */
  public final class FilterRequest extends Request {
      private final Request request;
      /*
       * We have to use the f prefix, because IntelliJ's JUnit4IdeaTestRunner uses
       * reflection to access this field. See
       * https://github.com/junit-team/junit/issues/960
       */
      private final Filter fFilter;
  
      /**
       * Creates a filtered Request
       *
       * @param request a {@link Request} describing your Tests
       * @param filter {@link Filter} to apply to the Tests described in
       * <code>request</code>
       */
      public FilterRequest(Request request, Filter filter) {
          this.request = request;
          this.fFilter = filter;
      }
  
      @Override
      public Runner getRunner() {
          try {
              Runner runner = request.getRunner();
              fFilter.apply(runner);
              return runner;
          } catch (NoTestsRemainException e) {
              return new ErrorReportingRunner(Filter.class, new Exception(String
                      .format("No tests found matching %s from %s", fFilter
                              .describe(), request.toString())));
          }
      }
  }