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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 implements FixedValueSource {
20  
21      private final FixedValueSource delegate;
22  
23      protected AbstractDelegatingValueSource(FixedValueSource delegate) {
24          if (delegate == null) {
25              throw new NullPointerException("Delegate ValueSource cannot be null.");
26          }
27  
28          this.delegate = delegate;
29      }
30  
31      protected FixedValueSource getDelegate() {
32          return delegate;
33      }
34  
35      public Object getValue(String expression, InterpolationState interpolationState) {
36          return getDelegate().getValue(expression, interpolationState);
37      }
38  }