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.camel.language.bean;
018    
019    import org.apache.camel.Exchange;
020    import org.apache.camel.component.bean.BeanProcessor;
021    import org.apache.camel.component.bean.RegistryBean;
022    import org.apache.camel.impl.ExpressionSupport;
023    
024    /**
025     * Evaluates an expression using a bean method invocation
026     *
027     * @version $Revision: 36321 $
028     */
029    public class BeanExpression<E extends Exchange> extends ExpressionSupport<E> {
030        private String beanName;
031        private String method;
032    
033        public BeanExpression(String beanName, String method) {
034            this.beanName = beanName;
035            this.method = method;
036        }
037    
038        @Override
039        public String toString() {
040            return "BeanExpression[bean: " + beanName + " method: " + method + "]";
041        }
042    
043        protected String assertionFailureMessage(E exchange) {
044            return "bean: " + beanName + " method: " + method;
045        }
046    
047        public Object evaluate(E exchange) {
048            BeanProcessor processor = new BeanProcessor(new RegistryBean(exchange.getContext(), beanName));
049            if (method != null) {
050                processor.setMethod(method);
051            }
052            try {
053                Exchange newExchange = exchange.copy();
054                processor.process(newExchange);
055                return newExchange.getOut(true).getBody();
056            } catch (Exception e) {
057                throw new RuntimeBeanExpressionException(exchange, beanName, method, e);
058            }
059        }
060    }