package org.apache.maven.shared.dependency.graph.internal;
   
   /*
    * 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.apache.maven.shared.dependency.graph.DependencyGraphBuilderException;
  
  /**
   * Invokes method on objects using reflection.
   */
  final class Invoker
  {
      private Invoker()
      {
          // do not instantiate
      }
  
      static <T extends Exception> Object invoke( Object object, String method, ExceptionHandler<T> exceptionHandler )
          throws T
      {
          return invoke( object.getClass(), object, method, exceptionHandler );
      }
  
      static <T extends Exception> Object invoke( Class<?> objectClazz, Object object, String method,
                                                  ExceptionHandler<T> exceptionHandler )
          throws T
      {
          try
          {
              return objectClazz.getMethod( method ).invoke( object );
          }
          catch ( ReflectiveOperationException e )
          {
              throw exceptionHandler.create( e.getMessage(), e );
          }
      }
  
      static Object invoke( Object object, String method, Class<?> clazz, Object arg )
          throws DependencyGraphBuilderException
      {
          try
          {
              final Class<?> objectClazz = object.getClass();
              return objectClazz.getMethod( method, clazz ).invoke( object, arg );
          }
          catch ( ReflectiveOperationException e )
          {
              throw new DependencyGraphBuilderException( e.getMessage(), e );
          }
      }
      
      static <T extends Exception> Object invoke( Class<?> objectClazz, String staticMethod,
                                                                 Class<?> argClazz, Object arg,
                                                                 ExceptionHandler<T> exceptionHandler )
          throws T
      {
          try
          {
              return objectClazz.getMethod( staticMethod, argClazz ).invoke( null, arg );
          }
          catch ( ReflectiveOperationException e )
          {
              throw exceptionHandler.create( e.getMessage(), e );
          }
      }
  
      static <T extends Exception> Object invoke( Class<?> objectClazz, String staticMethod, Class<?> argClazz1,
                                                  Class<?> argClazz2, Object arg1, Object arg2,
                                                  ExceptionHandler<T> exceptionHandler )
          throws T
      {
          try
          {
              return objectClazz.getMethod( staticMethod, argClazz1, argClazz2 ).invoke( null, arg1, arg2 );
          }
          catch ( ReflectiveOperationException e )
          {
              throw exceptionHandler.create( e.getMessage(), e );
          }
      }
  }