/*
    * $Id: ScopePropertyAccessor.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.PropertyAccessor;
  
  import org.apache.tiles.request.Request;
  
  /**
   * Accesses a scope.
   *
   * @version $Rev: 1049696 $ $Date: 2010-12-16 07:30:10 +1100 (Thu, 16 Dec 2010) $
   */
  public class ScopePropertyAccessor implements PropertyAccessor {
  
      /**
       * The length of the scope suffix: "Scope".
       */
      static final int SCOPE_SUFFIX_LENGTH = 5;
  
      @Override
      public Object getProperty(@SuppressWarnings("rawtypes") Map context, Object target, Object name) {
          Request request = (Request) target;
          String scope = (String) name;
          if (scope.endsWith("Scope")) {
              String scopeName = scope.substring(0, scope.length() - SCOPE_SUFFIX_LENGTH);
              return request.getContext(scopeName);
          }
          return null;
      }
  
      @Override
      public String getSourceAccessor(OgnlContext context, Object target,
              Object index) {
          String scope = (String) index;
          if (scope.endsWith("Scope")) {
              String scopeName = scope.substring(0, scope.length() - SCOPE_SUFFIX_LENGTH);
              return ".getContext(\"" + scopeName + "\")";
          }
          return null;
      }
  
      @Override
      public String getSourceSetter(OgnlContext context, Object target,
              Object index) {
          return null;
      }
  
      @Override
      public void setProperty(@SuppressWarnings("rawtypes") Map context, Object target, Object name,
              Object value) {
          // Does nothing.
      }
  
  }