org.apache.camel.component.rss.AggregateRssFeedStrategy Maven / Gradle / Ivy
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* 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,
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* See the License for the specific language governing permissions and
* limitations under the License.
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package org.apache.camel.component.rss;
import java.util.ArrayList;
import java.util.List;
import com.rometools.rome.feed.synd.SyndEntry;
import com.rometools.rome.feed.synd.SyndFeed;
import org.apache.camel.AggregationStrategy;
import org.apache.camel.Exchange;
import org.apache.camel.util.CastUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class AggregateRssFeedStrategy implements AggregationStrategy {
protected final Logger log = LoggerFactory.getLogger(AggregateRssFeedStrategy.class);
@Override
public Exchange aggregate(Exchange oldExchange, Exchange newExchange) {
if (oldExchange == null) {
return newExchange;
}
SyndFeed oldFeed = oldExchange.getIn().getBody(SyndFeed.class);
SyndFeed newFeed = newExchange.getIn().getBody(SyndFeed.class);
if (oldFeed != null && newFeed != null) {
List oldEntries = CastUtils.cast(oldFeed.getEntries());
List newEntries = CastUtils.cast(newFeed.getEntries());
List mergedList = new ArrayList<>(oldEntries.size() + newEntries.size());
mergedList.addAll(oldEntries);
mergedList.addAll(newEntries);
oldFeed.setEntries(mergedList);
} else {
log.debug("Could not merge exchanges. One body was null.");
}
return oldExchange;
}
}