/*
* Copyright 2002-2017 the original author or authors.
*
* Licensed 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.springframework.integration.aggregator;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import org.springframework.integration.store.MessageGroup;
import org.springframework.messaging.Message;
import org.springframework.util.Assert;
/**
* This implementation of MessageGroupProcessor will take the messages from the
* MessageGroup and pass them on in a single message with a Collection as a payload.
*
* @author Iwein Fuld
* @author Alexander Peters
* @author Mark Fisher
* @since 2.0
*/
public class DefaultAggregatingMessageGroupProcessor extends AbstractAggregatingMessageGroupProcessor {
@Override
protected final Object aggregatePayloads(MessageGroup group, Map<String, Object> headers) {
Collection<Message<?>> messages = group.getMessages();
Assert.notEmpty(messages, this.getClass().getSimpleName() + " cannot process empty message groups");
List<Object> payloads = new ArrayList<Object>(messages.size());
for (Message<?> message : messages) {
payloads.add(message.getPayload());
}
return payloads;
}
}