/*

  * $Id: TilesContextBeanVariableResolverFactory.java 1049688 2010-12-15 20:15:41Z 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.mvel;

 import org.apache.tiles.context.TilesRequestContextHolder;

 import org.apache.tiles.request.Request;

 import org.mvel2.integration.VariableResolver;

 /**

  * Resolves beans stored in request, session and application scopes.

  *

  * @version $Rev: 1049688 $ $Date: 2010-12-16 07:15:41 +1100 (Thu, 16 Dec 2010) $

  * @since 2.2.0

  */

 public class TilesContextBeanVariableResolverFactory extends

         ReadOnlyVariableResolverFactory {

     /**

      * Constructor.

      *

      * @param requestHolder The Tiles request holder.

      * @since 2.2.0

      */

     public TilesContextBeanVariableResolverFactory(TilesRequestContextHolder requestHolder) {

         super(requestHolder);

     }

     /** {@inheritDoc} */

     @Override

     public VariableResolver createVariableResolver(String name) {

         return new TilesContextBeanVariableResolver(name);

     }

     /** {@inheritDoc} */

     public boolean isTarget(String name) {

         Request request = requestHolder.getTilesRequestContext();

         for (String scope : request.getAvailableScopes()) {

             if (request.getContext(scope).containsKey(name)) {

                 return true;

             }

         }

         return false;

     }

     /**

      * Resolves a single attribute stored in request, session or application scope.

      *

      * @version $Rev: 1049688 $ $Date: 2010-12-16 07:15:41 +1100 (Thu, 16 Dec 2010) $

      * @since 2.2.0

      */

     private class TilesContextBeanVariableResolver extends ReadOnlyVariableResolver {

         /**

          * Constructor.

          *

          * @param name The name of the attribute.

          * @since 2.2.0

          */

         public TilesContextBeanVariableResolver(String name) {

             super(name);

         }

         /** {@inheritDoc} */

         @SuppressWarnings("rawtypes")

         public Class getType() {

             Object value = getValue();

             if (value != null) {

                 return value.getClass();

             }

             return Object.class;

         }

         /** {@inheritDoc} */

         public Object getValue() {

             Request request = requestHolder.getTilesRequestContext();

             for (String scope : request.getAvailableScopes()) {

                 Object value = request.getContext(scope).get(name);

                 if (value != null) {

                     return value;

                 }

             }

             return null;

         }

     }

 }