1 

     2 /**

     3  * Relational pipes

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

     5  *

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

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

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

     9  *

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

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

    12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

    13  * GNU General Public License for more details.

    14  *

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

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

    17  */

    18 import java.io.File;

    19 import java.io.IOException;

    20 import java.util.LinkedList;

    21 import java.util.List;

    22 import java.util.jar.JarFile;

    23 

    24 public class JarInfo extends Streamlet {

    25 

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

    27 		JarInfo s = new JarInfo();

    28 		int status = s.run();

    29 		System.exit(status);

    30 

    31 		// TODO: return real values:

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

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

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

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

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

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

    38 	}

    39 

    40 	protected List<Streamlet.AttributeMetadata> getOutputAttributesMetadata() {

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

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

    43 		return result;

    44 	}

    45 

    46 	protected List<Object> getOutputAttributes() {

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

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

    49 		return result;

    50 	}

    51 }