/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.camel.language.bean;
import org.apache.camel.Exchange;
import org.apache.camel.ExchangePattern;
import org.apache.camel.component.bean.BeanHolder;
import org.apache.camel.component.bean.BeanProcessor;
import org.apache.camel.component.bean.ConstantBeanHolder;
import org.apache.camel.component.bean.RegistryBean;
import org.apache.camel.impl.ExpressionSupport;
/**
* Evaluates an expression using a bean method invocation
*
* @version $Revision: 688350 $
*/
public class BeanExpression<E extends Exchange> extends ExpressionSupport<E> {
private String beanName;
private String method;
private Object bean;
public BeanExpression(Object bean, String method) {
this.bean = bean;
this.method = method;
}
public BeanExpression(String beanName, String method) {
this.beanName = beanName;
this.method = method;
}
@Override
public String toString() {
return "BeanExpression[bean:" + (bean == null ? beanName : bean) + " method: " + method + "]";
}
protected String assertionFailureMessage(E exchange) {
return "bean: " + beanName + " method: " + method;
}
public Object evaluate(E exchange) {
// either use registry lookup or a constant bean
BeanHolder holder;
if (bean == null) {
holder = new RegistryBean(exchange.getContext(), beanName);
} else {
holder = new ConstantBeanHolder(bean, exchange.getContext());
}
BeanProcessor processor = new BeanProcessor(holder);
if (method != null) {
processor.setMethod(method);
}
try {
Exchange newExchange = exchange.copy();
// The BeanExperession always has a result regardless of the ExchangePattern,
// so I add a checker here to make sure we can get the result.
if (!newExchange.getPattern().isOutCapable()) {
newExchange.setPattern(ExchangePattern.InOut);
}
processor.process(newExchange);
return newExchange.getOut(true).getBody();
} catch (Exception e) {
throw new RuntimeBeanExpressionException(exchange, beanName, method, e);
}
}
}