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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.io.InputStream;
import java.util.Comparator;
import java.util.List;
import java.util.stream.Collectors;

import com.apptasticsoftware.rssreader.Item;
import com.apptasticsoftware.rssreader.RssReader;
import com.apptasticsoftware.rssreader.util.ItemComparator;
import org.apache.camel.CamelContext;
import org.apache.camel.support.ResourceHelper;
import org.apache.camel.util.IOHelper;

public final class AtomUtils {

    public static List readItems(CamelContext camelContext, String uri, RssReader reader, boolean sort)
            throws IOException {
        if (ResourceHelper.isHttpUri(uri)) {
            return reader
                    .read(uri)
                    .sorted(sort ? ItemComparator.oldestItemFirst() : Comparator.naturalOrder())
                    .collect(Collectors.toList());
        } else {
            InputStream is = ResourceHelper.resolveMandatoryResourceAsInputStream(camelContext, uri);
            try {
                return reader
                        .read(is)
                        .sorted(sort ? ItemComparator.oldestItemFirst() : Comparator.naturalOrder())
                        .collect(Collectors.toList());
            } finally {
                IOHelper.close(is);
            }
        }
    }
}