1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.betwixt.expression;
18
19
20 /** <p><code>ClassNameExpression</code> returns the current class name
21 * of the context bean
22 *
23 * @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
24 * @since 0.5
25 */
26 public class ClassNameExpression implements Expression {
27
28 /** Base constructor */
29 public ClassNameExpression() {
30 }
31
32 /**
33 * Evaluate on the current context and return the class name
34 *
35 * @param context the context against which this expression will be evaluated
36 * @return the name of the class of the current contex bean
37 */
38 public Object evaluate(Context context) {
39 Object bean = context.getBean();
40 if ( bean != null ) {
41 return bean.getClass().getName();
42 }
43 return null;
44 }
45
46 /**
47 * Do nothing.
48 * @see org.apache.commons.betwixt.expression.Expression
49 */
50 public void update(Context context, String newValue) {
51 // do nothing
52 }
53
54 /**
55 * Returns something useful for logging.
56 * @return something useful for logging
57 */
58 public String toString() {
59 return "ClassNameExpression";
60 }
61 }