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.Assertions.checkNotNull;
  
  import java.lang.reflect.InvocationTargetException;
  import java.lang.reflect.Method;
  
  class DefaultMappedPropertyGetterAccessor<B>
      implements MappedPropertyGetterAccessor
  {
  
      private final B bean;
      private final String propertyName;
      private final Method mappedReadMethod;
  
      /**
       * Constructs a new instance of DefaultMappedPropertyGetterAccessor.
       *
       * @param bean
       * @param propertyName
       * @param mappedReadMethod
       */
      public DefaultMappedPropertyGetterAccessor( B bean, String propertyName, Method mappedReadMethod )
      {
          this.bean = bean;
          this.propertyName = propertyName;
          this.mappedReadMethod = mappedReadMethod;
      }
  
      /**
       * {@inheritDoc}
       */
      public BeanAccessor<?> of( String key )
      {
          checkNotNull( key, "Can not get mapped property '%s' in bean of type '%s' for null!", propertyName,
                        bean.getClass().getName() );
          Object mappedValue = invokeGetter( key );
          return wrapInAccessor( mappedValue );
      }
  
      private Object invokeGetter( String key )
      {
          try
          {
              return mappedReadMethod.invoke( bean, key );
          }
          catch ( IllegalAccessException e )
          {
              throw new PropertyGetterNotAccessibleException( propertyName, mappedReadMethod.getName(), bean.getClass(), e );
          }
          catch ( InvocationTargetException e )
          {
              throw new PropertyGetterInvocationException( propertyName, mappedReadMethod.getName(), bean.getClass(), e );
          }
      }
  
      private BeanAccessor<?> wrapInAccessor( Object mappedValue )
      {
          if ( mappedValue != null )
          {
              return new DefaultBeanAccessor<Object>( mappedValue );
          }
          else
          {
              return new NullBeanAccessor<Object>( bean.getClass().getName(), mappedReadMethod.getName() );
          }
      }
  
  }