package org.apache.maven.surefire.util;
   
   /*
    * 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;
  
  /**
   * @author Kristian Rosenvold
   */
  public final class ReflectionUtils
  {
      private static final Class<?>[] EMPTY_CLASS_ARRAY = new Class<?>[0];
      private static final Object[] EMPTY_OBJECT_ARRAY = new Object[0];
  
      private ReflectionUtils()
      {
          throw new IllegalStateException( "no instantiable constructor" );
      }
  
      public static Method getMethod( Object instance, String methodName, Class<?>... parameters )
      {
          return getMethod( instance.getClass(), methodName, parameters );
      }
  
      public 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 static Method tryGetMethod( Class<?> clazz, String methodName, Class<?>... parameters )
      {
          try
          {
              return clazz.getMethod( methodName, parameters );
          }
          catch ( NoSuchMethodException e )
          {
              return null;
          }
      }
  
      public static Object invokeGetter( Object instance, String methodName )
      {
          return invokeGetter( instance.getClass(), instance, methodName );
      }
  
      public static Object invokeGetter( Class<?> instanceType, Object instance, String methodName )
      {
          Method method = getMethod( instanceType, methodName );
          return invokeMethodWithArray( instance, method );
      }
  
      public static Constructor getConstructor( Class<?> clazz, Class<?>... arguments )
      {
          try
          {
              return clazz.getConstructor( arguments );
          }
          catch ( NoSuchMethodException e )
          {
              throw new SurefireReflectionException( e );
          }
      }
  
      public static Object newInstance( Constructor constructor, Object... params )
      {
          try
          {
              return constructor.newInstance( params );
          }
          catch ( ReflectiveOperationException e )
          {
              throw new SurefireReflectionException( e );
         }
     }
 
     public static <T> T instantiate( ClassLoader classLoader, String classname, Class<T> returnType )
     {
         try
         {
             Class<?> clazz = loadClass( classLoader, classname );
             return returnType.cast( clazz.newInstance() );
         }
         catch ( ReflectiveOperationException e )
         {
             throw new SurefireReflectionException( e );
         }
     }
 
     public static Object instantiateOneArg( ClassLoader classLoader, String className, Class<?> param1Class,
                                             Object param1 )
     {
         try
         {
             Class<?> aClass = loadClass( classLoader, className );
             Constructor constructor = getConstructor( aClass, param1Class );
             return constructor.newInstance( param1 );
         }
         catch ( InvocationTargetException e )
         {
             throw new SurefireReflectionException( e.getTargetException() );
         }
         catch ( ReflectiveOperationException e )
         {
             throw new SurefireReflectionException( e );
         }
     }
 
     public static Object instantiateTwoArgs( ClassLoader classLoader, String className, Class<?> param1Class,
                                              Object param1, Class param2Class, Object param2 )
     {
         try
         {
             Class<?> aClass = loadClass( classLoader, className );
             Constructor constructor = getConstructor( aClass, param1Class, param2Class );
             return constructor.newInstance( param1, param2 );
         }
         catch ( InvocationTargetException e )
         {
             throw new SurefireReflectionException( e.getTargetException() );
         }
         catch ( ReflectiveOperationException e )
         {
             throw new SurefireReflectionException( e );
         }
     }
 
     public static void invokeSetter( Object o, String name, Class<?> value1clazz, Object value )
     {
         Method setter = getMethod( o, name, value1clazz );
         invokeSetter( o, setter, value );
     }
 
     public static Object invokeSetter( Object target, Method method, Object value )
     {
         return invokeMethodWithArray( target, method, value );
     }
 
     public static Object invokeMethodWithArray( Object target, Method method, Object... args )
     {
         try
         {
             return method.invoke( target, args );
         }
         catch ( IllegalAccessException e )
         {
             throw new SurefireReflectionException( e );
         }
         catch ( InvocationTargetException e )
         {
             throw new SurefireReflectionException( e.getTargetException() );
         }
     }
 
     public static Object invokeMethodWithArray2( Object target, Method method, Object... args )
         throws InvocationTargetException
     {
         try
         {
             return method.invoke( target, args );
         }
         catch ( IllegalAccessException e )
         {
             throw new SurefireReflectionException( e );
         }
     }
 
     public static Object instantiateObject( String className, Class[] types, Object[] params, ClassLoader classLoader )
     {
         Class<?> clazz = loadClass( classLoader, className );
         final Constructor constructor = getConstructor( clazz, types );
         return newInstance( constructor, params );
     }
 
     @SuppressWarnings( "checkstyle:emptyblock" )
     public static Class<?> tryLoadClass( ClassLoader classLoader, String className )
     {
         try
         {
             return classLoader.loadClass( className );
         }
         catch ( NoClassDefFoundError | ClassNotFoundException ignore )
         {
         }
         return null;
     }
 
     public static Class<?> loadClass( ClassLoader classLoader, String className )
     {
         try
         {
             return classLoader.loadClass( className );
         }
         catch ( NoClassDefFoundError | ClassNotFoundException e )
         {
             throw new SurefireReflectionException( e );
         }
     }
 
     /**
      * Invoker of public static no-argument method.
      *
      * @param clazz         class on which public static no-argument {@code methodName} is invoked
      * @param methodName    public static no-argument method to be called
      * @param parameterTypes    method parameter types
      * @param parameters    method parameters
      * @return value returned by {@code methodName}
      * @throws RuntimeException if no such method found
      * @throws SurefireReflectionException if the method could not be called or threw an exception.
      * It has original cause Exception.
      */
     public static Object invokeStaticMethod( Class<?> clazz, String methodName,
                                              Class<?>[] parameterTypes, Object[] parameters )
     {
         if ( parameterTypes.length != parameters.length )
         {
             throw new IllegalArgumentException( "arguments length do not match" );
         }
         Method method = getMethod( clazz, methodName, parameterTypes );
         return invokeMethodWithArray( null, method, parameters );
     }
 
     /**
      * Method chain invoker.
      *
      * @param classesChain        classes to invoke on method chain
      * @param noArgMethodNames    chain of public methods to call
      * @param fallback            returned value if a chain could not be invoked due to an error
      * @return successfully returned value from the last method call; {@code fallback} otherwise
      * @throws IllegalArgumentException if {@code classes} and {@code noArgMethodNames} have different array length
      */
     public static Object invokeMethodChain( Class<?>[] classesChain, String[] noArgMethodNames, Object fallback )
     {
         if ( classesChain.length != noArgMethodNames.length )
         {
             throw new IllegalArgumentException( "arrays must have the same length" );
         }
         Object obj = null;
         try
         {
             for ( int i = 0, len = noArgMethodNames.length; i < len; i++ )
             {
                 if ( i == 0 )
                 {
                     obj = invokeStaticMethod( classesChain[i], noArgMethodNames[i],
                                                     EMPTY_CLASS_ARRAY, EMPTY_OBJECT_ARRAY );
                 }
                 else
                 {
                     Method method = getMethod( classesChain[i], noArgMethodNames[i] );
                     obj = invokeMethodWithArray( obj, method );
                 }
             }
             return obj;
         }
         catch ( RuntimeException e )
         {
             return fallback;
         }
     }
 }