/*
    * $Id: TilesContextPropertyAccessorDelegateFactory.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 ognl.PropertyAccessor;
  
  import org.apache.tiles.request.ApplicationContext;
  import org.apache.tiles.request.Request;
  import org.apache.tiles.util.CombinedBeanInfo;
  
  /**
   * Decides the appropriate {@link PropertyAccessor} for the given property name
   * and {@link Request}.
   *
   * @version $Rev: 1049696 $ $Date: 2010-12-16 07:30:10 +1100 (Thu, 16 Dec 2010) $
   * @since 2.2.0
   */
  public class TilesContextPropertyAccessorDelegateFactory implements
          PropertyAccessorDelegateFactory<Request> {
  
      /**
       * The plain object property accessor, to be used directly for
       * {@link Request}.
       */
      private PropertyAccessor objectPropertyAccessor;
  
      /**
       * The application context property accessor.
       */
      private PropertyAccessor applicationContextPropertyAccessor;
  
      /**
       * The request scope property accessor.
       */
      private PropertyAccessor anyScopePropertyAccessor;
  
      /**
       * The session scope property accessor.
       */
      private PropertyAccessor scopePropertyAccessor;
  
      /**
       * The bean info of {@link Request} and
       * {@link org.apache.tiles.request.ApplicationContext}.
       */
      private CombinedBeanInfo beanInfo;
  
      /**
       * Constructor.
       *
       * @param objectPropertyAccessor The plain object property accessor, to be
       * used directly for {@link Request}.
       * @param applicationContextPropertyAccessor The application context
       * property accessor.
       * @param anyScopePropertyAccessor The request scope property accessor.
       * @param scopePropertyAccessor The session scope property accessor.
       * @since 2.2.0
       */
      public TilesContextPropertyAccessorDelegateFactory(
              PropertyAccessor objectPropertyAccessor,
              PropertyAccessor applicationContextPropertyAccessor,
              PropertyAccessor anyScopePropertyAccessor,
              PropertyAccessor scopePropertyAccessor) {
          beanInfo = new CombinedBeanInfo(Request.class, ApplicationContext.class);
          this.objectPropertyAccessor = objectPropertyAccessor;
          this.applicationContextPropertyAccessor = applicationContextPropertyAccessor;
          this.anyScopePropertyAccessor = anyScopePropertyAccessor;
          this.scopePropertyAccessor = scopePropertyAccessor;
      }
  
      /** {@inheritDoc} */
      public PropertyAccessor getPropertyAccessor(String propertyName,
              Request request) {
          PropertyAccessor retValue;
          if (propertyName.endsWith("Scope")) {
              String scopeName = propertyName.substring(0, propertyName.length()
                      - ScopePropertyAccessor.SCOPE_SUFFIX_LENGTH);
              if (request.getContext(scopeName) != null) {
                  return scopePropertyAccessor;
              }
         }
         if (beanInfo.getMappedDescriptors(Request.class)
                 .containsKey(propertyName)) {
             retValue = objectPropertyAccessor;
         } else if (beanInfo.getMappedDescriptors(ApplicationContext.class)
                 .containsKey(propertyName)) {
             retValue = applicationContextPropertyAccessor;
         } else {
             return anyScopePropertyAccessor;
         }
         return retValue;
     }
 }