package org.apache.maven.surefire.booter;
   
   /*
    * 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.junit.After;
  import org.junit.Before;
  import org.junit.Test;
  import org.junit.internal.runners.model.ReflectiveCallable;
  import org.junit.internal.runners.statements.ExpectException;
  import org.junit.internal.runners.statements.Fail;
  import org.junit.internal.runners.statements.RunAfters;
  import org.junit.internal.runners.statements.RunBefores;
  import org.junit.runner.notification.RunNotifier;
  import org.junit.runners.BlockJUnit4ClassRunner;
  import org.junit.runners.model.FrameworkMethod;
  import org.junit.runners.model.InitializationError;
  import org.junit.runners.model.Statement;
  import org.junit.runners.model.TestClass;
  
  import java.io.File;
  import java.io.IOException;
  import java.lang.annotation.Annotation;
  import java.net.MalformedURLException;
  import java.net.URL;
  import java.net.URLClassLoader;
  import java.util.Collection;
  import java.util.HashSet;
  import java.util.List;
  
  import static java.io.File.pathSeparator;
  import static org.apache.commons.io.FileUtils.readFileToString;
  
  /**
   * JUnit runner testing methods in a separate class loader.
   *
   * @author Tibor Digana (tibor17)
   * @since 2.19
   */
  public class NewClassLoaderRunner
      extends BlockJUnit4ClassRunner
  {
      private Class<?> cls;
  
      public NewClassLoaderRunner( Class<?> clazz )
          throws InitializationError
      {
          super( clazz );
      }
  
      @Override
      protected void runChild( FrameworkMethod method, RunNotifier notifier )
      {
          ClassLoader backup = Thread.currentThread().getContextClassLoader();
          try
          {
              TestClassLoader loader = new TestClassLoader();
              Thread.currentThread().setContextClassLoader( loader );
              cls = getFromTestClassLoader( getTestClass().getName(), loader );
              method = new FrameworkMethod( cls.getMethod( method.getName() ) );
              super.runChild( method, notifier );
          }
          catch ( NoSuchMethodException e )
          {
              throw new IllegalStateException( e );
          }
          finally
          {
              Thread.currentThread().setContextClassLoader( backup );
          }
      }
  
      @Override
      protected Statement methodBlock( FrameworkMethod method )
      {
          try
          {
              Object test = new ReflectiveCallable()
              {
                  @Override
                  protected Object runReflectiveCall()
                      throws Throwable
                  {
                     return createTest();
                 }
             }.run();
 
             Statement statement = methodInvoker( method, test );
             statement = possiblyExpectingExceptions( method, test, statement );
             statement = withBefores( method, test, statement );
             statement = withAfters( method, test, statement );
             return statement;
         }
         catch ( Throwable e )
         {
             return new Fail( e );
         }
     }
 
     @Override
     @SuppressWarnings( "unchecked" )
     protected Statement possiblyExpectingExceptions( FrameworkMethod method, Object test, Statement next )
     {
         try
         {
             Class<? extends Annotation> t =
                 (Class<? extends Annotation>) Thread.currentThread().getContextClassLoader().loadClass(
                     Test.class.getName() );
             Annotation annotation = method.getAnnotation( t );
             Class<? extends Throwable> exp =
                 (Class<? extends Throwable>) t.getMethod( "expected" ).invoke( annotation );
             boolean isException = exp != null && !Test.None.class.getName().equals( exp.getName() );
             return isException ? new ExpectException( next, exp ) : next;
         }
         catch ( Exception e )
         {
             throw new IllegalStateException( e );
         }
     }
 
     @Override
     @SuppressWarnings( "unchecked" )
     protected Statement withBefores( FrameworkMethod method, Object target, Statement statement )
     {
         try
         {
             Class<? extends Annotation> before =
                 (Class<? extends Annotation>) Thread.currentThread().getContextClassLoader().loadClass(
                     Before.class.getName() );
             List<FrameworkMethod> befores = new TestClass( target.getClass() ).getAnnotatedMethods( before );
             return befores.isEmpty() ? statement : new RunBefores( statement, befores, target );
         }
         catch ( ClassNotFoundException e )
         {
             throw new IllegalStateException( e );
         }
     }
 
     @Override
     @SuppressWarnings( "unchecked" )
     protected Statement withAfters( FrameworkMethod method, Object target, Statement statement )
     {
         try
         {
             Class<? extends Annotation> after =
                 (Class<? extends Annotation>) Thread.currentThread().getContextClassLoader().loadClass(
                     After.class.getName() );
             List<FrameworkMethod> afters = new TestClass( target.getClass() ).getAnnotatedMethods( after );
             return afters.isEmpty() ? statement : new RunAfters( statement, afters, target );
         }
         catch ( ClassNotFoundException e )
         {
             throw new IllegalStateException( e );
         }
     }
 
     @Override
     protected Object createTest()
         throws Exception
     {
         return cls == null ? super.createTest() : cls.getConstructor().newInstance();
     }
 
     private static Class<?> getFromTestClassLoader( String clazz, TestClassLoader loader )
     {
         try
         {
             return Class.forName( clazz, true, loader );
         }
         catch ( ClassNotFoundException e )
         {
             throw new IllegalStateException( e );
         }
     }
 
     public static class TestClassLoader
         extends URLClassLoader
     {
         public TestClassLoader()
         {
             super( toClassPath(), null );
         }
 
         /**
          * Compliant with Java 9 or prior version of JRE.
          *
          * @return classpath
          */
         private static URL[] toClassPath()
         {
             try
             {
                 Collection<URL> cp = toPathList(); // if Maven run
                 if ( cp.isEmpty() )
                 {
                     // if IDE
                     cp = toPathList( System.getProperty( "java.class.path" ) );
                 }
                 return cp.toArray( new URL[cp.size()] );
             }
             catch ( IOException e )
             {
                 return new URL[0];
             }
         }
 
         private static Collection<URL> toPathList( String path ) throws MalformedURLException
         {
             Collection<URL> classPath = new HashSet<URL>();
             for ( String file : path.split( pathSeparator ) )
             {
                 classPath.add( new File( file ).toURL() );
             }
             return classPath;
         }
 
         private static Collection<URL> toPathList()
         {
             Collection<URL> classPath = new HashSet<URL>();
             try
             {
                 String[] files = readFileToString( new File( "target/test-classpath/cp.txt" ) ).split( pathSeparator );
                 for ( String file : files )
                 {
                     File f = new File( file );
                     File dir = f.getParentFile();
                     classPath.add( ( dir.getName().equals( "target" ) ? new File( dir, "classes" ) : f ).toURL() );
                 }
                 classPath.add( new File( "target/classes" ).toURL() );
                 classPath.add( new File( "target/test-classes" ).toURL() );
             }
             catch ( IOException e )
             {
                 // turn to java.class.path
                 classPath.clear();
             }
             return classPath;
         }
     }
 }