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1   package org.codehaus.plexus.interpolation.fixed;
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  public abstract class AbstractDelegatingValueSource
20      implements FixedValueSource
21  {
22      
23      private final FixedValueSource delegate;
24  
25      protected AbstractDelegatingValueSource( FixedValueSource delegate )
26      {
27          if ( delegate == null )
28          {
29              throw new NullPointerException( "Delegate ValueSource cannot be null." );
30          }
31          
32          this.delegate = delegate;
33      }
34      
35      protected FixedValueSource getDelegate()
36      {
37          return delegate;
38      }
39  
40      public Object getValue( String expression, InterpolationState interpolationState ){
41          return getDelegate().getValue( expression, interpolationState );
42      }
43  }