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.BeanHolder; 022 import org.apache.camel.component.bean.BeanProcessor; 023 import org.apache.camel.component.bean.ConstantBeanHolder; 024 import org.apache.camel.component.bean.RegistryBean; 025 import org.apache.camel.impl.ExpressionSupport; 026 027 /** 028 * Evaluates an expression using a bean method invocation 029 * 030 * @version $Revision: 47154 $ 031 */ 032 public class BeanExpression<E extends Exchange> extends ExpressionSupport<E> { 033 private String beanName; 034 private String method; 035 private Object bean; 036 037 public BeanExpression(Object bean, String method) { 038 this.bean = bean; 039 this.method = method; 040 } 041 042 public BeanExpression(String beanName, String method) { 043 this.beanName = beanName; 044 this.method = method; 045 } 046 047 @Override 048 public String toString() { 049 return "BeanExpression[bean:" + (bean == null ? beanName : bean) + " method: " + method + "]"; 050 } 051 052 protected String assertionFailureMessage(E exchange) { 053 return "bean: " + beanName + " method: " + method; 054 } 055 056 public Object evaluate(E exchange) { 057 // either use registry lookup or a constant bean 058 BeanHolder holder; 059 if (bean == null) { 060 holder = new RegistryBean(exchange.getContext(), beanName); 061 } else { 062 holder = new ConstantBeanHolder(bean, exchange.getContext()); 063 } 064 065 BeanProcessor processor = new BeanProcessor(holder); 066 if (method != null) { 067 processor.setMethod(method); 068 } 069 try { 070 Exchange newExchange = exchange.copy(); 071 // The BeanExperession always has a result regardless of the ExchangePattern, 072 // so I add a checker here to make sure we can get the result. 073 if (!newExchange.getPattern().isOutCapable()) { 074 newExchange.setPattern(ExchangePattern.InOut); 075 } 076 processor.process(newExchange); 077 return newExchange.getOut(true).getBody(); 078 } catch (Exception e) { 079 throw new RuntimeBeanExpressionException(exchange, beanName, method, e); 080 } 081 } 082 }