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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  import java.util.ArrayList;
20  import java.util.List;
21  
22  public abstract class AbstractValueSource
23      implements ValueSource
24  {
25      
26      private final List feedback;
27      
28      protected AbstractValueSource( boolean usesFeedback )
29      {
30          if ( usesFeedback )
31          {
32              feedback = new ArrayList();
33          }
34          else
35          {
36              feedback = null;
37          }
38      }
39  
40      public void clearFeedback()
41      {
42          if ( feedback != null )
43          {
44              feedback.clear();
45          }
46      }
47  
48      public List getFeedback()
49      {
50          return feedback;
51      }
52  
53      protected void addFeedback( String message )
54      {
55          feedback.add( message );
56      }
57      
58      protected void addFeedback( String message, Throwable cause )
59      {
60          feedback.add( message );
61          feedback.add( cause );
62      }
63  }