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 class ReflectionUtils

 {

     private static final Class[] NO_ARGS = new Class[0];

     private static final Object[] NO_ARGS_VALUES = new Object[0];

     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 NestedRuntimeException( "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 )

     {

         final Method method = getMethod( instance, methodName, NO_ARGS );

         return invokeMethodWithArray( instance, method, NO_ARGS_VALUES );

     }

     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 ( InvocationTargetException e )

         {

             throw new SurefireReflectionException( e );

         }

         catch ( InstantiationException e )

         {

             throw new SurefireReflectionException( e );

         }

         catch ( IllegalAccessException e )

         {

             throw new SurefireReflectionException( e );

         }

     }

     public static Object instantiate( ClassLoader classLoader, String classname )

     {

         try

         {

             Class clazz = loadClass( classLoader, classname );

             return clazz.newInstance();

         }

         catch ( InstantiationException e )

         {

             throw new SurefireReflectionException( e );

         }

         catch ( IllegalAccessException 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 = ReflectionUtils.getConstructor( aClass, new Class[]{ param1Class } );

             return constructor.newInstance( new Object[]{ param1 } );

         }

         catch ( InvocationTargetException e )

         {

             throw new SurefireReflectionException( e );

         }

         catch ( InstantiationException e )

         {

             throw new SurefireReflectionException( e );

         }

         catch ( IllegalAccessException e )

         {

             throw new SurefireReflectionException( e );

         }

     }

     public static Object invokeSetter( Object o, String name, Class value1clazz, Object value )

     {

         final Method setter = getMethod( o, name, new Class[]{ value1clazz } );

         return invokeSetter( o, setter, value );

     }

     public static Object invokeSetter( Object target, Method method, Object value )

     {

         return invokeMethodWithArray( target, method, new Object[]{ 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 );

         }

     }

     public static Object instantiateObject( String className, Object[] params, ClassLoader classLoader )

     {

         try

         {

             Class clazz = loadClass( classLoader, className );

             Object object;

             if ( params != null )

             {

                 Class[] paramTypes = new Class[params.length];

                 for ( int j = 0; j < params.length; j++ )

                 {

                     if ( params[j] == null )

                     {

                         paramTypes[j] = String.class;

                     }

                     else

                     {

                         paramTypes[j] = params[j].getClass();

                     }

                 }

                 Constructor constructor = getConstructor( clazz, paramTypes );

                 object = newInstance( constructor, params );

             }

             else

             {

                 object = clazz.newInstance();

             }

             return object;

         }

         catch ( IllegalAccessException e )

         {

             throw new SurefireReflectionException( e );

         }

         catch ( InstantiationException e )

         {

             throw new SurefireReflectionException( e );

         }

     }

     public static Class tryLoadClass( ClassLoader classLoader, String className )

     {

         try

         {

             return classLoader.loadClass( className );

         }

         catch ( NoClassDefFoundError ignore )

         {

         }

         catch ( ClassNotFoundException ignore )

         {

         }

         return null;

     }

     public static Class loadClass( ClassLoader classLoader, String className )

     {

         try

         {

             return classLoader.loadClass( className );

         }

         catch ( NoClassDefFoundError e )

         {

             throw new SurefireReflectionException( e );

         }

         catch ( ClassNotFoundException e )

         {

             throw new SurefireReflectionException( e );

         }

     }

 }