/**
   * @throws IllegalStateException if the directory could not be created (to implement the contract
   *     of {@link Files#createTempDir()}, such as if the system does not support creating temporary
   *     directories securely
   */
  abstract File createTempDir();

  abstract File createTempFile(String prefix) throws IOException;

  private static TempFileCreator pickSecureCreator() {
    try {

  private static URL makeJarUrlWithName(String name) throws IOException {
    /*
     * TODO: cpovirk - Use java.nio.file.Files.createTempDirectory instead of
     * c.g.c.io.Files.createTempDir?
     */
    File fullPath = new File(Files.createTempDir(), name);
    File jarFile = pickAnyJarFile();
    Files.copy(jarFile, fullPath);
    return fullPath.toURI().toURL();
  }

   *     call to {@code createTempDirectory}.
   */
  @Beta
  @Deprecated
  @J2ObjCIncompatible
  public static File createTempDir() {
    return TempFileCreator.INSTANCE.createTempDir();
  }

  /**
   * Creates an empty file or updates the last updated timestamp on the same as the unix command of
   * the same name.
   *

   *     call to {@code createTempDirectory}.
   */
  @Beta
  @Deprecated
  @J2ObjCIncompatible
  public static File createTempDir() {
    return TempFileCreator.INSTANCE.createTempDir();
  }

  /**
   * Creates an empty file or updates the last updated timestamp on the same as the unix command of
   * the same name.
   *

/**
 * Unit test for {@link Files}.
 *
 * <p>Some methods are tested in separate files:
 *
 * <ul>
 *   <li>{@link Files#fileTraverser()} is tested in {@link FilesFileTraverserTest}.
 *   <li>{@link Files#createTempDir()} is tested in {@link FilesCreateTempDirTest}.
 * </ul>
 *
 * @author Chris Nokleberg
 */

@SuppressWarnings("InlineMeInliner") // many tests of deprecated methods
@NullUnmarked

/**
 * Unit test for {@link Files}.
 *
 * <p>Some methods are tested in separate files:
 *
 * <ul>
 *   <li>{@link Files#fileTraverser()} is tested in {@link FilesFileTraverserTest}.
 *   <li>{@link Files#createTempDir()} is tested in {@link FilesCreateTempDirTest}.
 * </ul>
 *
 * @author Chris Nokleberg
 */

@SuppressWarnings("InlineMeInliner") // many tests of deprecated methods
@NullUnmarked