camel-core/src/test/java/org/apache/camel/processor/aggregator/AggregateRepositoryReturnNullTest.java

/**
 * 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.processor.aggregator;

import org.apache.camel.CamelExchangeException;
import org.apache.camel.CamelExecutionException;
import org.apache.camel.ContextTestSupport;
import org.apache.camel.Exchange;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.processor.aggregate.AggregationStrategy;

/**
 * @version $Revision$
 */
public class AggregateRepositoryReturnNullTest extends ContextTestSupport {

    public void testAggregateRepositoryReturnNull() throws Exception {
        try {
            template.sendBodyAndHeader("direct:start", "Hello World", "id", 123);
            fail("Should throw exception");
        } catch (CamelExecutionException e) {
            assertIsInstanceOf(CamelExchangeException.class, e.getCause());
            assertTrue(e.getCause().getMessage().startsWith("AggregationStrategy"));
            assertTrue(e.getCause().getMessage().contains("returned null which is not allowed"));
        }
    }

    @Override
    protected RouteBuilder createRouteBuilder() throws Exception {
        return new RouteBuilder() {
            @Override
            public void configure() throws Exception {
                from("direct:start")
                    .aggregate(header("id"), new MyNullAggregationStrategy()).completionSize(3)
                        .to("mock:result");
            }
        };
    }

    private class MyNullAggregationStrategy implements AggregationStrategy {
        public Exchange aggregate(Exchange oldExchange, Exchange newExchange) {
            // on purpose
            return null;
        }
    }

}