package org.apache.maven.surefire.junitcore;
   
   /*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  
  import java.util.List;
  import java.util.concurrent.ExecutionException;
  import org.apache.maven.surefire.testset.TestSetFailedException;
  import org.apache.maven.surefire.util.TestsToRun;
  
  import org.junit.runner.Computer;
  import org.junit.runner.JUnitCore;
  import org.junit.runner.Result;
  import org.junit.runner.notification.RunListener;
  
  /**
   * Encapsulates access to JUnitCore
   *
   * @author Kristian Rosenvold
   */
  
  class JUnitCoreWrapper
  {
      public static void execute( TestsToRun testsToRun, JUnitCoreParameters jUnitCoreParameters,
                                  List<RunListener> listeners )
          throws TestSetFailedException
      {
          Computer computer = getComputer( jUnitCoreParameters );
          JUnitCore junitCore = new JUnitCore();
          for ( RunListener runListener : listeners )
          {
              junitCore.addListener( runListener );
          }
          try
          {
              final Result run = junitCore.run( computer, testsToRun.getLocatedClasses() );
  
              if ( run.getFailureCount() > 0 )
              {
                  // There is something interesting going on here;
                  // the "run" result can contain other exceptions that did not occur as
                  // part of the test run, for instance if something bad happened in the
                  // RunListener. But it also contains regular problems from the test-run.
                  // I am not entirely sure of what to do with this; it might even be
                  // that these errors are the correct errors to report back to the client.
              }
          }
          finally
          {
              closeIfConfigurable( computer );
              for ( RunListener runListener : listeners )
              {
                  junitCore.removeListener( runListener );
              }
          }
      }
  
      private static void closeIfConfigurable( Computer computer )
          throws TestSetFailedException
      {
          if ( computer instanceof ConfigurableParallelComputer )
          {
              try
              {
                  ( (ConfigurableParallelComputer) computer ).close();
              }
              catch ( ExecutionException e )
              {
                  throw new TestSetFailedException( e );
              }
          }
      }
  
      private static Computer getComputer( JUnitCoreParameters jUnitCoreParameters )
          throws TestSetFailedException
      {
          if ( jUnitCoreParameters.isNoThreading() )
          {
              return new Computer();
          }
          return getConfigurableParallelComputer( jUnitCoreParameters );
      }
  
     private static Computer getConfigurableParallelComputer( JUnitCoreParameters jUnitCoreParameters )
         throws TestSetFailedException
     {
         if ( jUnitCoreParameters.isUseUnlimitedThreads() )
         {
             return new ConfigurableParallelComputer();
         }
         else
         {
             return new ConfigurableParallelComputer(
                 jUnitCoreParameters.isParallelClasses() | jUnitCoreParameters.isParallelBoth(),
                 jUnitCoreParameters.isParallelMethod() | jUnitCoreParameters.isParallelBoth(),
                 jUnitCoreParameters.getThreadCount(), jUnitCoreParameters.isPerCoreThreadCount() );
         }
     }
 }