001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     * 
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     * 
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */ 
017     package org.apache.commons.betwixt.expression;
018    
019    
020    /** <p><code>ClassNameExpression</code> returns the current class name 
021      * of the context bean
022      *
023      * @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
024      * @since 0.5
025      */
026    public class ClassNameExpression implements Expression {
027    
028        /** Base constructor */
029        public ClassNameExpression() {
030        }
031        
032        /** 
033         * Evaluate on the current context and return the class name  
034         *
035         * @param context the context against which this expression will be evaluated
036         * @return the name of the class of the current contex bean
037         */
038        public Object evaluate(Context context) {
039            Object bean = context.getBean();
040            if ( bean != null ) {
041                return bean.getClass().getName();
042            }
043            return null;
044        }
045    
046        /** 
047         * Do nothing.
048         * @see org.apache.commons.betwixt.expression.Expression
049         */
050        public void update(Context context, String newValue) {
051            // do nothing
052        }
053        
054        /** 
055         * Returns something useful for logging.
056         * @return something useful for logging
057         */
058        public String toString() {
059            return "ClassNameExpression";
060        }
061    }