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1   package org.codehaus.plexus.interpolation.fixed;
2   
3   /*
4    * Copyright 2014 The 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.Map;
20  
21  /**
22   * Wraps a Map, and looks up the whole expression as a single key, returning the
23   * value mapped to it.
24   * @version $Id$
25   */
26  public class MapBasedValueSource
27      implements FixedValueSource
28  {
29  
30      private final Map values;
31  
32      /**
33       * Construct a new value source to wrap the supplied map.
34       */
35      public MapBasedValueSource( Map values )
36      {
37          this.values = values;
38      }
39  
40      /**
41       * Lookup the supplied expression as a key in the wrapped Map, and return
42       * its value.
43       */
44      public Object getValue( String expression, InterpolationState interpolationState )
45      {
46          return values == null ? null : values.get( expression );
47      }
48  
49  }