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SirixDB is a hybrid on-disk and in-memory document oriented, versioned database system. It has a lightweight buffer manager, stores everything in a huge persistent and durable tree and allows efficient reconstruction of every revision. Furthermore, SirixDB implements change tracking, diffing and supports time travel queries.

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package io.sirix.utils;

import java.io.File;
import java.io.IOException;
import java.io.UncheckedIOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Comparator;
import java.util.stream.Stream;

/**
 * Static methods for file operations.
 *
 * @author Johannes Lichtenberger, University of Konstanz
 */
public final class SirixFiles {

  /**
   * Utility methods.
   */
  private SirixFiles() {
    throw new AssertionError("May not be instantiated!");
  }

  /**
   * Recursively remove a directory.
   *
   * @param path {@link Path} to the directory
   * @throws UncheckedIOException if any I/O operation fails
   * @throws NullPointerException if any of the arguments are {@code null}
   */
  public static void recursiveRemove(final Path path) {
    if (Files.exists(path)) {
      try (var stream = Files.walk(path)) {
        stream.sorted(Comparator.reverseOrder()).map(Path::toFile).forEach(File::delete);
      } catch (final IOException e) {
        throw new UncheckedIOException(e);
      }
    }
  }

  public static boolean isDirectoryEmpty(Path path) {
    if (Files.isDirectory(path)) {
      try (final Stream entries = Files.list(path)) {
        return entries.findFirst().isEmpty();
      } catch (final IOException e) {
        throw new UncheckedIOException(e);
      }
    }

    return false;
  }
}