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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   */
25  public class MapBasedValueSource implements FixedValueSource {
26  
27      private final Map values;
28  
29      /**
30       * Construct a new value source to wrap the supplied map.
31       * @param values the key/value pairs.
32       */
33      public MapBasedValueSource(Map values) {
34          this.values = values;
35      }
36  
37      /**
38       * Lookup the supplied expression as a key in the wrapped Map, and return
39       * its value.
40       */
41      public Object getValue(String expression, InterpolationState interpolationState) {
42          return values == null ? null : values.get(expression);
43      }
44  }