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1   /*
2    * $Id: NestedObjectExtractor.java 817009 2009-09-20 11:26:26Z apetrelli $
3    *
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   * http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing,
15   * software distributed under the License is distributed on an
16   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17   * KIND, either express or implied.  See the License for the
18   * specific language governing permissions and limitations
19   * under the License.
20   */
21  
22  package org.apache.tiles.ognl;
23  
24  /**
25   * Extracts an object using another object as a basis.
26   *
27   * @param <T> The type of the root object.
28   * @version $Rev: 817009 $ $Date: 2009-09-20 21:26:26 +1000 (Sun, 20 Sep 2009) $
29   * @since 2.2.0
30   */
31  public interface NestedObjectExtractor<T> {
32  
33      /**
34       * Extracts the nested object.
35       *
36       * @param obj The root object.
37       * @return The extracted nested object.
38       * @since 2.2.0
39       */
40      Object getNestedObject(T obj);
41  }