package org.apache.maven.surefire.common.junit3;
   
   /*
    * 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.Constructor;
  import java.lang.reflect.InvocationTargetException;
  import java.lang.reflect.Method;
  import java.lang.reflect.Modifier;
  import org.apache.maven.surefire.util.ReflectionUtils;
  
  public final class JUnit3Reflector
  {
      private static final String TEST_CASE = "junit.framework.Test";
  
      private static final String TEST_RESULT = "junit.framework.TestResult";
  
      private static final String TEST_LISTENER = "junit.framework.TestListener";
  
      private static final String TEST = "junit.framework.Test";
  
      private static final String ADD_LISTENER_METHOD = "addListener";
  
      private static final String RUN_METHOD = "run";
  
      private static final String TEST_SUITE = "junit.framework.TestSuite";
  
      private final Class[] interfacesImplementedByDynamicProxy;
  
      private final Class testResultClass;
  
      private final Method addListenerMethod;
  
      private final Method testInterfaceRunMethod;
  
      private static final Class[] EMPTY_CLASS_ARRAY = new Class[0];
  
      private static final Object[] EMPTY_OBJECT_ARRAY = new Object[0];
  
      private final Class testInterface;
  
      private final Class testCase;
  
      private final Constructor testsSuiteConstructor;
  
      public JUnit3Reflector( ClassLoader testClassLoader )
      {
          testResultClass = ReflectionUtils.tryLoadClass( testClassLoader, TEST_RESULT );
          testCase = ReflectionUtils.tryLoadClass( testClassLoader, TEST_CASE );
          testInterface = ReflectionUtils.tryLoadClass( testClassLoader, TEST );
          interfacesImplementedByDynamicProxy =
              new Class[]{ ReflectionUtils.tryLoadClass( testClassLoader, TEST_LISTENER ) };
          Class[] constructorParamTypes = { Class.class };
  
          Class testSuite = ReflectionUtils.tryLoadClass( testClassLoader, TEST_SUITE );
  
          // The interface implemented by the dynamic proxy (TestListener), happens to be
          // the same as the param types of TestResult.addTestListener
          Class[] addListenerParamTypes = interfacesImplementedByDynamicProxy;
  
          if ( isJUnit3Available() )
          {
              testsSuiteConstructor = ReflectionUtils.getConstructor( testSuite, constructorParamTypes );
              addListenerMethod = tryGetMethod( testResultClass, ADD_LISTENER_METHOD, addListenerParamTypes );
              testInterfaceRunMethod = getMethod( testInterface, RUN_METHOD, new Class[]{ testResultClass } );
          }
          else
          {
              testsSuiteConstructor = null;
              addListenerMethod = null;
              testInterfaceRunMethod = null;
          }
      }
  
      // Switch to reflectionutils when building with 2.7.2
      private static Method tryGetMethod( Class clazz, String methodName, Class[] parameters )
      {
          try
          {
              return clazz.getMethod( methodName, parameters );
          }
          catch ( NoSuchMethodException e )
          {
             return null;
         }
     }
 
     private static Method getMethod( Class clazz, String methodName, Class[] parameters )
     {
         try
         {
             return clazz.getMethod( methodName, parameters );
         }
         catch ( NoSuchMethodException e )
         {
             throw new RuntimeException( "When finding method " + methodName, e );
         }
     }
 
 
     public Object constructTestObject( Class testClass )
         throws IllegalAccessException, InvocationTargetException, NoSuchMethodException, InstantiationException
     {
         Object testObject = createInstanceFromSuiteMethod( testClass );
 
         if ( testObject == null && testCase.isAssignableFrom( testClass ) )
         {
             Object[] constructorParams = { testClass };
 
             testObject = testsSuiteConstructor.newInstance( constructorParams );
         }
 
         if ( testObject == null )
         {
             Constructor testConstructor = getTestConstructor( testClass );
 
             if ( testConstructor.getParameterTypes().length == 0 )
             {
                 testObject = testConstructor.newInstance( EMPTY_OBJECT_ARRAY );
             }
             else
             {
                 testObject = testConstructor.newInstance( testClass.getName() );
             }
         }
         return testObject;
     }
 
     private static Object createInstanceFromSuiteMethod( Class testClass )
         throws IllegalAccessException, InvocationTargetException
     {
         Object testObject = null;
         try
         {
             Method suiteMethod = testClass.getMethod( "suite", EMPTY_CLASS_ARRAY );
 
             if ( Modifier.isPublic( suiteMethod.getModifiers() ) && Modifier.isStatic( suiteMethod.getModifiers() ) )
             {
                 testObject = suiteMethod.invoke( null, EMPTY_CLASS_ARRAY );
             }
         }
         catch ( NoSuchMethodException e )
         {
             // No suite method
         }
         return testObject;
     }
 
     private static Constructor getTestConstructor( Class testClass )
         throws NoSuchMethodException
     {
         Constructor constructor;
         try
         {
             constructor = testClass.getConstructor( new Class[]{ String.class } );
         }
         catch ( NoSuchMethodException e )
         {
             constructor = testClass.getConstructor( EMPTY_CLASS_ARRAY );
         }
         return constructor;
     }
 
     public Class[] getInterfacesImplementedByDynamicProxy()
     {
         return interfacesImplementedByDynamicProxy;
     }
 
     public Class getTestResultClass()
     {
         return testResultClass;
     }
 
     public Method getAddListenerMethod()
     {
         return addListenerMethod;
     }
 
     public Method getTestInterfaceRunMethod()
     {
         return testInterfaceRunMethod;
     }
 
     public Class getTestInterface()
     {
         return testInterface;
     }
 
     public Method getRunMethod( Class testClass )
     {
         return getMethod( testClass, RUN_METHOD, new Class[]{ getTestResultClass() } );
     }
 
     public boolean isJUnit3Available()
     {
         return testResultClass != null;
     }
 }