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 }