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1   package org.codehaus.plexus.interpolation;
2   
3   /*
4    * Copyright 2001-2008 Codehaus Foundation.
5    *
6    * Licensed under the Apache License, Version 2.0 (the "License");
7    * you may not use this file except in compliance with the License.
8    * You may obtain a copy of the License at
9    *
10   *      http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  
19  /**
20   * Used to allow full recursion of value interpolation before applying some rule
21   * to the result.
22   * @version $Id$
23   */
24  public interface InterpolationPostProcessor
25  {
26      
27      /**
28       * Given the starting expression and the fully-recursively-interpolated value,
29       * perform some post-processing step and return the resulting [possibly different]
30       * value, or null if no change was made..
31       * 
32       * @param expression the original expression
33       * @param value the original value after fully recursive interpolation of expression
34       * @return the processed value if a change was made; else return null
35       */
36      Object execute( String expression, Object value );
37  
38  }