package org.apache.maven.surefire.junit;
   
   /*
    * 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.lang.reflect.InvocationHandler;
  import java.lang.reflect.InvocationTargetException;
  import java.lang.reflect.Method;
  import java.util.HashSet;
  import java.util.Set;
  import org.apache.maven.surefire.report.LegacyPojoStackTraceWriter;
  import org.apache.maven.surefire.report.ReportEntry;
  import org.apache.maven.surefire.report.RunListener;
  import org.apache.maven.surefire.report.SimpleReportEntry;
  
  /**
   * Invocation Handler for TestListener proxies to delegate to our {@link RunListener}
   *
   */
  public class TestListenerInvocationHandler
      implements InvocationHandler
  {
      // The String names of the four methods in interface junit.framework.TestListener
      private static final String START_TEST = "startTest";
  
      private static final String ADD_FAILURE = "addFailure";
  
      private static final String ADD_ERROR = "addError";
  
      private static final String END_TEST = "endTest";
  
      private final Set<FailedTest> failedTestsSet = new HashSet<>();
  
      private RunListener reporter;
  
      private static final Class[] EMPTY_CLASS_ARRAY = { };
  
      private static final Object[] EMPTY_STRING_ARRAY = { };
  
      private static class FailedTest
      {
          private Object testThatFailed;
  
          private Thread threadOnWhichTestFailed;
  
          FailedTest( Object testThatFailed, Thread threadOnWhichTestFailed )
          {
              if ( testThatFailed == null )
              {
                  throw new NullPointerException( "testThatFailed is null" );
              }
  
              if ( threadOnWhichTestFailed == null )
              {
                  throw new NullPointerException( "threadOnWhichTestFailed is null" );
              }
  
              this.testThatFailed = testThatFailed;
  
              this.threadOnWhichTestFailed = threadOnWhichTestFailed;
          }
  
          @Override
          public boolean equals( Object obj )
          {
              boolean retVal = true;
  
              if ( obj == null || getClass() != obj.getClass() )
              {
                  retVal = false;
              }
              else
              {
                  FailedTest ft = (FailedTest) obj;
  
                  if ( ft.testThatFailed != testThatFailed )
                  {
                      retVal = false;
                  }
                  else if ( !ft.threadOnWhichTestFailed.equals( threadOnWhichTestFailed ) )
                  {
                      retVal = false;
                  }
             }
 
             return retVal;
         }
 
         @Override
         public int hashCode()
         {
             return threadOnWhichTestFailed.hashCode();
         }
     }
 
     public TestListenerInvocationHandler( RunListener reporter )
     {
         if ( reporter == null )
         {
             throw new NullPointerException( "reporter is null" );
         }
 
         this.reporter = reporter;
     }
 
     @Override
     public Object invoke( Object proxy, Method method, Object[] args )
         throws Throwable
     {
         String methodName = method.getName();
 
         switch ( methodName )
         {
             case START_TEST:
                 handleStartTest( args );
                 break;
             case ADD_ERROR:
                 handleAddError( args );
                 break;
             case ADD_FAILURE:
                 handleAddFailure( args );
                 break;
             case END_TEST:
                 handleEndTest( args );
                 break;
             default:
                 break;
         }
 
         return null;
     }
 
     // Handler for TestListener.startTest(Test)
     private void handleStartTest( Object[] args )
     {
         ReportEntry report = new SimpleReportEntry( args[0].getClass().getName(), args[0].toString() );
 
         reporter.testStarting( report );
     }
 
     // Handler for TestListener.addFailure(Test, Throwable)
     private void handleAddError( Object[] args )
         throws IllegalAccessException, InvocationTargetException
     {
         ReportEntry report = SimpleReportEntry.withException( args[0].getClass().getName(), args[0].toString(),
                                                               getStackTraceWriter( args ) );
 
         reporter.testError( report );
 
         failedTestsSet.add( new FailedTest( args[0], Thread.currentThread() ) );
     }
 
     private LegacyPojoStackTraceWriter getStackTraceWriter( Object[] args )
         throws IllegalAccessException, InvocationTargetException
     {
         String testName;
 
         try
         {
             Method m = args[0].getClass().getMethod( "getName", EMPTY_CLASS_ARRAY );
             testName = (String) m.invoke( args[0], EMPTY_STRING_ARRAY );
         }
         catch ( NoSuchMethodException e )
         {
             testName = "UNKNOWN";
         }
 
         return new LegacyPojoStackTraceWriter( args[0].getClass().getName(), testName, (Throwable) args[1] );
     }
 
     private void handleAddFailure( Object[] args )
         throws IllegalAccessException, InvocationTargetException
     {
         ReportEntry report = SimpleReportEntry.withException( args[0].getClass().getName(), args[0].toString(),
                                                               getStackTraceWriter( args ) );
 
         reporter.testFailed( report );
 
         failedTestsSet.add( new FailedTest( args[0], Thread.currentThread() ) );
     }
 
     private void handleEndTest( Object[] args )
     {
         boolean testHadFailed = failedTestsSet.remove( new FailedTest( args[0], Thread.currentThread() ) );
 
         if ( !testHadFailed )
         {
             ReportEntry report = new SimpleReportEntry( args[0].getClass().getName(), args[0].toString() );
 
             reporter.testSucceeded( report );
         }
     }
 }