| /** |
| * 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.component.rss; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import com.sun.syndication.feed.synd.SyndEntryImpl; |
| import com.sun.syndication.feed.synd.SyndFeed; |
| |
| import org.apache.camel.Exchange; |
| import org.apache.camel.processor.aggregate.AggregationStrategy; |
| 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); |
| |
| 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<SyndEntryImpl> oldEntries = CastUtils.cast(oldFeed.getEntries()); |
| List<SyndEntryImpl> newEntries = CastUtils.cast(newFeed.getEntries()); |
| List<SyndEntryImpl> mergedList = new ArrayList<SyndEntryImpl>(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; |
| } |
| } |