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.processor.aggregate; 018 019 import java.lang.reflect.Method; 020 import java.util.ArrayList; 021 import java.util.List; 022 023 import org.apache.camel.CamelContext; 024 import org.apache.camel.Exchange; 025 import org.apache.camel.component.bean.ParameterInfo; 026 027 /** 028 * Method information about the POJO method to call when using the {@link AggregationStrategyBeanAdapter}. 029 */ 030 public class AggregationStrategyMethodInfo { 031 032 private final CamelContext camelContext; 033 private final Class<?> type; 034 private final Method method; 035 private final List<ParameterInfo> oldParameters; 036 private final List<ParameterInfo> newParameters; 037 038 public AggregationStrategyMethodInfo(CamelContext camelContext, Class<?> type, Method method, 039 List<ParameterInfo> oldParameters, List<ParameterInfo> newParameters) { 040 this.camelContext = camelContext; 041 this.type = type; 042 this.method = method; 043 this.oldParameters = oldParameters; 044 this.newParameters = newParameters; 045 } 046 047 public Object invoke(Object pojo, Exchange oldExchange, Exchange newExchange) throws Exception { 048 // evaluate the parameters 049 List<Object> list = new ArrayList<Object>(oldParameters.size() + newParameters.size()); 050 for (ParameterInfo info : oldParameters) { 051 if (oldExchange != null) { 052 Object value = info.getExpression().evaluate(oldExchange, info.getType()); 053 list.add(value); 054 } else { 055 // use a null value as oldExchange is null 056 list.add(null); 057 } 058 } 059 for (ParameterInfo info : newParameters) { 060 if (newExchange != null) { 061 Object value = info.getExpression().evaluate(newExchange, info.getType()); 062 list.add(value); 063 } else { 064 // use a null value as newExchange is null 065 list.add(null); 066 } 067 } 068 069 Object[] args = list.toArray(); 070 return method.invoke(pojo, args); 071 } 072 }