import static gov.loc.repository.bagit.hash.StandardSupportedAlgorithms.SHA1;

import java.io.File;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import gov.loc.repository.bagit.creator.BagCreator;
import gov.loc.repository.bagit.domain.Bag;
import gov.loc.repository.bagit.domain.Manifest;
import gov.loc.repository.bagit.writer.BagWriter;

public class bagdemo {
    public static void main( String[] args ) throws Exception {
        // setup bag
        Path bagdir = Paths.get("bagdir");
        Files.createDirectory(bagdir);
        Bag bag = BagCreator.bagInPlace(bagdir, Arrays.asList(SHA1), false);
        Manifest manifest = (Manifest)bag.getPayLoadManifests().toArray()[0];
        Map<Path, String> filemap = manifest.getFileToChecksumMap();

        // copy a file to the data directory and add to the bag manifest
        Path src = Paths.get("/path/to/foo.jpg");
        Path dst = Paths.get("bagdir/data/fcrepo/rest/foo.jpg");
        String sha1 = "eee158ac3120ad6e86218c2ad43d25901e8c6201";
        File parent = dst.toFile().getParentFile();
        if ( !parent.exists() ) {
            parent.mkdirs();
        }
        Files.copy(src, dst);
        filemap.put(dst, sha1);

        // finish bag
        BagWriter.write(bag, bag.getRootDir());
    }
}