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.Expression;
022 import org.apache.camel.Predicate;
023 import org.apache.camel.component.bean.BeanHolder;
024 import org.apache.camel.component.bean.BeanProcessor;
025 import org.apache.camel.component.bean.ConstantBeanHolder;
026 import org.apache.camel.component.bean.RegistryBean;
027 import org.apache.camel.util.ObjectHelper;
028
029 /**
030 * Evaluates an expression using a bean method invocation
031 *
032 * @version $Revision: 751450 $
033 */
034 public class BeanExpression implements Expression, Predicate {
035 private String beanName;
036 private String method;
037 private Object bean;
038
039 public BeanExpression(Object bean, String method) {
040 this.bean = bean;
041 this.method = method;
042 }
043
044 public BeanExpression(String beanName, String method) {
045 this.beanName = beanName;
046 this.method = method;
047 }
048
049 @Override
050 public String toString() {
051 return "BeanExpression[bean:" + (bean == null ? beanName : bean) + " method: " + method + "]";
052 }
053
054 protected String assertionFailureMessage(Exchange exchange) {
055 return "bean: " + beanName + " method: " + method;
056 }
057
058 public Object evaluate(Exchange exchange) {
059 // either use registry lookup or a constant bean
060 BeanHolder holder;
061 if (bean == null) {
062 holder = new RegistryBean(exchange.getContext(), beanName);
063 } else {
064 holder = new ConstantBeanHolder(bean, exchange.getContext());
065 }
066
067 BeanProcessor processor = new BeanProcessor(holder);
068 if (method != null) {
069 processor.setMethod(method);
070 }
071 try {
072 Exchange newExchange = exchange.copy();
073 // The BeanExperession always has a result regardless of the ExchangePattern,
074 // so I add a checker here to make sure we can get the result.
075 if (!newExchange.getPattern().isOutCapable()) {
076 newExchange.setPattern(ExchangePattern.InOut);
077 }
078 processor.process(newExchange);
079 return newExchange.getOut(true).getBody();
080 } catch (Exception e) {
081 throw new RuntimeBeanExpressionException(exchange, beanName, method, e);
082 }
083 }
084
085 public <T> T evaluate(Exchange exchange, Class<T> type) {
086 Object result = evaluate(exchange);
087 return exchange.getContext().getTypeConverter().convertTo(type, result);
088 }
089
090 public boolean matches(Exchange exchange) {
091 Object value = evaluate(exchange);
092 return ObjectHelper.evaluateValuePredicate(value);
093 }
094
095 public void assertMatches(String text, Exchange exchange) throws AssertionError {
096 }
097 }