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.ExchangePattern;
021 import org.apache.camel.component.bean.BeanProcessor;
022 import org.apache.camel.component.bean.RegistryBean;
023 import org.apache.camel.impl.ExpressionSupport;
024
025 /**
026 * Evaluates an expression using a bean method invocation
027 *
028 * @version $Revision: 675833 $
029 */
030 public class BeanExpression<E extends Exchange> extends ExpressionSupport<E> {
031 private String beanName;
032 private String method;
033
034 public BeanExpression(String beanName, String method) {
035 this.beanName = beanName;
036 this.method = method;
037 }
038
039 @Override
040 public String toString() {
041 return "BeanExpression[bean: " + beanName + " method: " + method + "]";
042 }
043
044 protected String assertionFailureMessage(E exchange) {
045 return "bean: " + beanName + " method: " + method;
046 }
047
048 public Object evaluate(E exchange) {
049 BeanProcessor processor = new BeanProcessor(new RegistryBean(exchange.getContext(), beanName));
050 if (method != null) {
051 processor.setMethod(method);
052 }
053 try {
054 Exchange newExchange = exchange.copy();
055 // The BeanExperession always has a result regardless of the ExchangePattern,
056 // so I add a checker here to make sure we can get the result.
057 if (!newExchange.getPattern().isOutCapable()) {
058 newExchange.setPattern(ExchangePattern.InOut);
059 }
060 processor.process(newExchange);
061 return newExchange.getOut(true).getBody();
062 } catch (Exception e) {
063 throw new RuntimeBeanExpressionException(exchange, beanName, method, e);
064 }
065 }
066 }