/**

 * Relational pipes

 * Copyright © 2020 František Kučera (Frantovo.cz, GlobalCode.info)

 *

 * This program is free software: you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation, version 3 of the License.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program. If not, see <http://www.gnu.org/licenses/>.

 */

import java.io.File;

import java.io.IOException;

import java.util.LinkedList;

import java.util.List;

import java.util.jar.JarFile;

public class JarInfo extends Streamlet {

	public static void main(String[] args) throws IOException {

		JarInfo s = new JarInfo();

		int status = s.run();

		System.exit(status);

		// TODO: return real values:

		JarFile jar = new JarFile(new File(args[0]));

		String mainClass = jar.getManifest() == null ? null : jar.getManifest().getMainAttributes().getValue("Main-Class");

		System.out.println("Name:       " + jar.getName());

		System.out.println("Comment:    " + jar.getComment());

		System.out.println("Entries:    " + jar.stream().count());

		System.out.println("Main class: " + mainClass);

	}

	protected List<Streamlet.AttributeMetadata> getOutputAttributesMetadata() {

		List<Streamlet.AttributeMetadata> result = new LinkedList<>();

		result.add(new Streamlet.AttributeMetadata("main_class", Streamlet.Type.STRING));

		return result;

	}

	protected List<Object> getOutputAttributes() {

		List<Object> result = new LinkedList<>();

		result.add("TODO: main class");

		return result;

	}

}