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Camel Atom support

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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,
 * 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.atom;

import java.io.IOException;
import java.util.List;

import com.apptasticsoftware.rssreader.Item;
import com.apptasticsoftware.rssreader.RssReader;
import org.apache.camel.Processor;
import org.apache.camel.component.feed.FeedEntryPollingConsumer;

/**
 * Consumer to poll atom feeds and return each entry from the feed step by step.
 */
public class AtomEntryPollingConsumer extends FeedEntryPollingConsumer {

    private RssReader rssReader;
    private List items;

    public AtomEntryPollingConsumer(AtomEndpoint endpoint, Processor processor, boolean throttleEntries) {
        super(endpoint, processor, throttleEntries);
    }

    @Override
    protected void doStart() throws Exception {
        this.rssReader = new RssReader();
        this.rssReader.addItemExtension("name", Item::setAuthor);
        super.doStart();
    }

    @Override
    protected void populateList(Object feed) throws IOException {
        // list is populated already in the createFeed method
    }

    @Override
    protected Object createFeed() throws IOException {
        return readItems();
    }

    @Override
    protected void resetList() {
        items = null;
    }

    private List readItems() throws IOException {
        if (items == null) {
            items = AtomUtils.readItems(endpoint.getCamelContext(), endpoint.getFeedUri(), rssReader, endpoint.isSortEntries());
            list = items;
            entryIndex = list.size() - 1;
        }
        return items;
    }

}