/*
    * $Id: NestedObjectDelegatePropertyAccessor.java 1049696 2010-12-15 20:30:10Z apetrelli $
    *
    * 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.
   */
  
  package org.apache.tiles.ognl;
  
  import java.util.Map;
  
  import ognl.OgnlContext;
  import ognl.OgnlException;
  import ognl.PropertyAccessor;
  
  /**
   * Uses a {@link PropertyAccessor} as a delegate, but passing a nested object as
   * target.
   *
   * @param <T> The root object type from which the target object will be
   * extracted.
   * @since 2.2.0
   * @version $Rev: 1049696 $ $Date: 2010-12-16 07:30:10 +1100 (Thu, 16 Dec 2010) $
   */
  public class NestedObjectDelegatePropertyAccessor<T> implements
          PropertyAccessor {
  
      /**
       * The extractor of the nested object.
       *
       * @since 2.2.0
       */
      private NestedObjectExtractor<T> nestedObjectExtractor;
  
      /**
       * The delegated property accessor.
       *
       * @since 2.2.0
       */
      private PropertyAccessor propertyAccessor;
  
      /**
       * Constructor.
       *
       * @param nestedObjectExtractor The extractor of the nested object.
       * @param propertyAccessor The delegated property accessor.
       * @since 2.2.0
       */
      public NestedObjectDelegatePropertyAccessor(
              NestedObjectExtractor<T> nestedObjectExtractor,
              PropertyAccessor propertyAccessor) {
          this.nestedObjectExtractor = nestedObjectExtractor;
          this.propertyAccessor = propertyAccessor;
      }
  
      /** {@inheritDoc} */
      @SuppressWarnings("unchecked")
      public Object getProperty(@SuppressWarnings("rawtypes") Map context, Object target, Object name)
              throws OgnlException {
          return propertyAccessor.getProperty(context, nestedObjectExtractor
                  .getNestedObject((T) target), name);
      }
  
      /** {@inheritDoc} */
      @SuppressWarnings("unchecked")
      public void setProperty(@SuppressWarnings("rawtypes") Map context, Object target, Object name,
              Object value) throws OgnlException {
          propertyAccessor.setProperty(context, nestedObjectExtractor
                  .getNestedObject((T) target), name, value);
      }
  
      /** {@inheritDoc} */
      @SuppressWarnings("unchecked")
      public String getSourceAccessor(OgnlContext context, Object target,
              Object index) {
          return propertyAccessor.getSourceAccessor(context,
                  nestedObjectExtractor.getNestedObject((T) target), index);
      }
  
      /** {@inheritDoc} */
      @SuppressWarnings("unchecked")
      public String getSourceSetter(OgnlContext context, Object target,
              Object index) {
          return propertyAccessor.getSourceSetter(context, nestedObjectExtractor
                  .getNestedObject((T) target), index);
     }
 }