/*

  * $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;

     }

 }