package org.apache.commons.beanutils2;
   
   /*
    * 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 static org.apache.commons.beanutils2.Argument.getParameterTypes;
  import static org.apache.commons.beanutils2.Argument.getParameters;
  import static org.apache.commons.beanutils2.Assertions.checkNoneIsNull;
  import static org.apache.commons.beanutils2.Assertions.checkNotNull;
  
  import java.lang.reflect.InvocationTargetException;
  import java.lang.reflect.Method;
  
  final class DefaultArgumentsAccessor
      implements ArgumentsAccessor
  {
  
      private final AccessibleObjectsRegistry<Method> methodsRegistry =
                      AccessibleObjectsRegistry.getMethodsRegistry();
  
      private final Class<?> beanType;
  
      private final boolean isExact;
  
      private final String methodName;
  
      private final Object bean;
  
      public <B> DefaultArgumentsAccessor( Class<B> beanType, boolean isExact, String methodName, B bean )
      {
          this.beanType = beanType;
          this.isExact = isExact;
          this.methodName = methodName;
          this.bean = bean;
      }
  
      public BeanAccessor<?> with( Argument<?>... arguments )
      {
          arguments = checkNotNull( arguments,
                                    "Impossible to invoke %s.%s with null arguments, use empty parameters instead",
                                    beanType.getName(),
                                    methodName );
          arguments = checkNoneIsNull( arguments );
  
          Method method = methodsRegistry.get( isExact, beanType, methodName, getParameterTypes( arguments ) );
  
          if ( method == null )
          {
              throw new NoSuchBeanMethodException( methodName, beanType, null );
          }
  
          Object result = invoke( method, arguments );
  
          if ( method.getReturnType() == void.class || result == null )
          {
              return new NullBeanAccessor<Object>( beanType.getName(), methodName );
          }
          return new DefaultBeanAccessor<Object>( result );
      }
  
      private Object invoke( Method method, Argument<?>... arguments )
      {
          try
          {
              return method.invoke( bean, getParameters( arguments ) );
          }
          catch ( IllegalAccessException e )
          {
              throw new MethodNotAccessibleException( method.getName(), beanType, e );
          }
          catch ( InvocationTargetException e )
          {
              throw new MethodInvocationException( method.getName(), beanType, e );
          }
      }
  
  }