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1   /*
2    * Copyright 2001-2004 The Apache Software Foundation.
3    * 
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    * 
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    * 
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */ 
16   package> org.apache.commons.betwixt.expression;
17  
18  
19  /*** <p><code>ClassNameExpression</code> returns the current class name 
20    * of the context bean
21    *
22    * @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
23    * @since 0.5
24    */
25  public class ClassNameExpression implements Expression {
26  
27      /*** Base constructor */
28      public ClassNameExpression() {
29      }
30      
31      /*** 
32       * Evaluate on the current context and return the class name  
33       *
34       * @param context the context against which this expression will be evaluated
35       * @return the name of the class of the current contex bean
36       */
37      public Object evaluate(Context context) {
38          Object bean = context.getBean();
39          if ( bean != null ) {
40              return bean.getClass().getName();
41          }
42          return null;
43      }
44  
45      /*** 
46       * Do nothing.
47       * @see org.apache.commons.betwixt.expression.Expression
48       */
49      public void update(Context context, String newValue) {
50          // do nothing
51      }
52      
53      /*** 
54       * Returns something useful for logging.
55       * @return something useful for logging
56       */
57      public String toString() {
58          return "ClassNameExpression";
59      }
60  }