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Main to run Kamelet standalone

There is a newer version: 4.9.0

/*
 * 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.main.download;

import org.apache.camel.CamelContext;
import org.apache.camel.dsl.modeline.DefaultModelineParser;
import org.apache.camel.dsl.modeline.Trait;
import org.apache.camel.spi.Resource;

public class DownloadModelineParser extends DefaultModelineParser {

    private final DependencyDownloader downloader;

    public DownloadModelineParser(CamelContext camelContext) {
        super(camelContext);
        this.downloader = camelContext.hasService(DependencyDownloader.class);
    }

    @Override
    public Trait parseModeline(Resource resource, String key, String value) {
        Trait answer = super.parseModeline(resource, key, value);
        if (downloader != null && answer != null) {
            // only trigger for modelines for traits that can parse
            downloader.onLoadingModeline(key, value);
        }
        return answer;
    }
}