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 org.apache.maven.surefire.common.junit4.Notifier;
  import org.apache.maven.surefire.junitcore.pc.ParallelComputer;
  import org.apache.maven.surefire.junitcore.pc.ParallelComputerBuilder;
  import org.apache.maven.surefire.report.ConsoleStream;
  import org.apache.maven.surefire.testset.TestSetFailedException;
  import org.apache.maven.surefire.util.TestsToRun;
  import org.junit.Ignore;
  import org.junit.runner.Computer;
  import org.junit.runner.Description;
  import org.junit.runner.Request;
  import org.junit.runner.Result;
  import org.junit.runner.manipulation.Filter;
  import org.junit.runner.notification.RunListener;
  import org.junit.runner.notification.StoppedByUserException;
  
  import java.util.Collection;
  import java.util.Collections;
  import java.util.Iterator;
  import java.util.Queue;
  
  import static org.apache.maven.surefire.common.junit4.JUnit4Reflector.createDescription;
  import static org.apache.maven.surefire.common.junit4.JUnit4Reflector.createIgnored;
  import static org.apache.maven.surefire.common.junit4.JUnit4RunListener.rethrowAnyTestMechanismFailures;
  import static org.junit.runner.Computer.serial;
  import static org.junit.runner.Request.classes;
  
  /**
   * Encapsulates access to JUnitCore
   *
   * @author Kristian Rosenvold
   */
  final class JUnitCoreWrapper
  {
      private final Notifier notifier;
      private final JUnitCoreParameters jUnitCoreParameters;
      private final ConsoleStream consoleStream;
  
      JUnitCoreWrapper( Notifier notifier, JUnitCoreParameters jUnitCoreParameters, ConsoleStream consoleStream )
      {
          this.notifier = notifier;
          this.jUnitCoreParameters = jUnitCoreParameters;
          this.consoleStream = consoleStream;
      }
  
      void execute( TestsToRun testsToRun, Filter filter )
          throws TestSetFailedException
      {
          execute( testsToRun, true, Collections.<RunListener>emptyList(), filter );
      }
  
      void execute( TestsToRun testsToRun, Collection<RunListener> listeners, Filter filter )
              throws TestSetFailedException
      {
          execute( testsToRun, false, listeners, filter );
      }
  
      private void execute( TestsToRun testsToRun, boolean useIterated, Collection<RunListener> listeners, Filter filter )
          throws TestSetFailedException
      {
          if ( testsToRun.allowEagerReading() )
          {
              executeEager( testsToRun, filter, listeners );
          }
          else
          {
              executeLazy( testsToRun, useIterated, filter, listeners );
          }
      }
  
      private JUnitCore createJUnitCore( Notifier notifier, Collection<RunListener> listeners )
      {
          JUnitCore junitCore = new JUnitCore();
  
          // custom listeners added last
          notifier.addListeners( listeners );
  
          return junitCore;
      }
 
     private void executeEager( TestsToRun testsToRun, Filter filter, Collection<RunListener> listeners )
         throws TestSetFailedException
     {
         JUnitCore junitCore = createJUnitCore( notifier, listeners );
         Class<?>[] tests = testsToRun.getLocatedClasses();
         Computer computer = createComputer();
         createRequestAndRun( filter, computer, junitCore.withReportedTests( tests ), tests );
     }
 
     private void executeLazy( TestsToRun testsToRun, boolean useIterated, Filter filter,
                               Collection<RunListener> listeners )
         throws TestSetFailedException
     {
         JUnitCore junitCore = createJUnitCore( notifier, listeners );
         for ( Iterator<Class<?>> it = useIterated ? testsToRun.iterated() : testsToRun.iterator(); it.hasNext(); )
         {
             Class<?> clazz = it.next();
             Computer computer = createComputer();
             createRequestAndRun( filter, computer, junitCore.withReportedTests( clazz ), clazz );
         }
     }
 
     private void createRequestAndRun( Filter filter, Computer computer, JUnitCore junitCore, Class<?>... classesToRun )
         throws TestSetFailedException
     {
         Request req = classes( computer, classesToRun );
         if ( filter != null )
         {
             req = new FilteringRequest( req, filter );
             if ( req.getRunner() == null )
             {
                 // nothing to run
                 return;
             }
         }
 
         Result run = junitCore.run( req.getRunner() );
         rethrowAnyTestMechanismFailures( run );
 
         if ( computer instanceof ParallelComputer )
         {
             String timeoutMessage = ( (ParallelComputer) computer ).describeElapsedTimeout();
             if ( timeoutMessage.length() != 0 )
             {
                 throw new TestSetFailedException( timeoutMessage );
             }
         }
     }
 
     private Computer createComputer()
     {
         return jUnitCoreParameters.isNoThreading()
             ? serial()
             : new ParallelComputerBuilder( consoleStream, jUnitCoreParameters ).buildComputer();
     }
 
     private final class JUnitCore
         extends org.apache.maven.surefire.junitcore.JUnitCore
     {
         JUnitCore()
         {
             super( JUnitCoreWrapper.this.notifier );
         }
 
         JUnitCore withReportedTests( Class<?>... tests )
         {
             Queue<String> stoppedTests = JUnitCoreWrapper.this.notifier.getRemainingTestClasses();
             if ( stoppedTests != null )
             {
                 for ( Class<?> test : tests )
                 {
                     stoppedTests.add( test.getName() );
                 }
             }
             return this;
         }
 
         @Override
         @SuppressWarnings( "checkstyle:innerassignment" )
         protected void afterException( Throwable e )
             throws TestSetFailedException
         {
             if ( JUnitCoreWrapper.this.notifier.isFailFast() && e instanceof StoppedByUserException )
             {
                 Queue<String> stoppedTests = JUnitCoreWrapper.this.notifier.getRemainingTestClasses();
                 if ( stoppedTests != null )
                 {
                     String reason = e.getClass().getName();
                     Ignore reasonForSkippedTest = createIgnored( reason );
                     for ( String clazz; ( clazz = stoppedTests.poll() ) != null; )
                     {
                         Description skippedTest = createDescription( clazz, reasonForSkippedTest );
                         JUnitCoreWrapper.this.notifier.fireTestIgnored( skippedTest );
                     }
                 }
             }
             else
             {
                 super.afterException( e );
             }
         }
 
         @Override
         protected void afterFinished()
         {
             Queue<String> stoppedTests = JUnitCoreWrapper.this.notifier.getRemainingTestClasses();
             if ( stoppedTests != null )
             {
                 stoppedTests.clear();
             }
         }
     }
 }