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A cafe example showing how to work with Camel

There is a newer version: 2.19.5

/**
 * 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.example.cafe.stuff;

import java.util.ArrayList;
import java.util.List;

import org.apache.camel.Exchange;
import org.apache.camel.example.cafe.Drink;
import org.apache.camel.processor.aggregate.AggregationStrategy;

public class CafeAggregationStrategy implements AggregationStrategy {

    @SuppressWarnings("unchecked")
    public Exchange aggregate(Exchange oldExchange, Exchange newExchange) {
        List drinks;
        if (oldExchange == null) {
            drinks = new ArrayList();           
        } else {
            drinks = (List) oldExchange.getIn().getBody();
        }
        drinks.add(newExchange.getIn().getBody(Drink.class));
        newExchange.getIn().setBody(drinks);
        return newExchange;
    }

}