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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.List;
20  
21  public abstract class AbstractDelegatingValueSource
22      implements ValueSource
23  {
24      
25      private final ValueSource delegate;
26  
27      protected AbstractDelegatingValueSource( ValueSource delegate )
28      {
29          if ( delegate == null )
30          {
31              throw new NullPointerException( "Delegate ValueSource cannot be null." );
32          }
33          
34          this.delegate = delegate;
35      }
36      
37      protected ValueSource getDelegate()
38      {
39          return delegate;
40      }
41  
42      public Object getValue( String expression )
43      {
44          return getDelegate().getValue( expression );
45      }
46      
47      public void clearFeedback()
48      {
49          delegate.clearFeedback();
50      }
51  
52      public List getFeedback()
53      {
54          return delegate.getFeedback();
55      }
56      
57  }