* iterator supports it.
   *
   * <p><b>{@code Stream} equivalent:</b> to concatenate an arbitrary number of streams, use {@code
   * Stream.of(stream1, stream2, ...).flatMap(s -> s)}. If the sources are iterables, use {@code
   * Stream.of(iter1, iter2, ...).flatMap(Streams::stream)}.
   *
   * @throws NullPointerException if any of the provided iterables is {@code null}
   * @since 20.0
   */
  @SafeVarargs

      "$prefix/samples/guide/src/main/java/okhttp3/recipes",
      "$prefix/samples/guide/src/main/java/okhttp3/recipes/kt",
    ).map { File(it) }

  return directories.flatMap {
    it
      .listFiles()
      .orEmpty()
      .filter { f -> f.isFile }
      .toList()
  }
}

internal class MainTestProvider : SimpleProvider() {
  override fun arguments(): List<Any> {

                    }

                    @Override
                    public Stream<Phase> allPhases() {
                        return Stream.concat(Stream.of(this), phases().stream().flatMap(Phase::allPhases));
                    }
                })
                .collect(Collectors.toList());
    }

    @Override
    public Collection<Alias> aliases() {
        return Collections.emptyList();

    }

    fun onTaskGraphReady() {
        resolveReportLocationsOnAdd = true
        taskPathToReports.values.asSequence()
            .flatMap { it }
            .forEach { it.resolve() }
    }

    private val rootBuildDir: File get() = parameters.rootBuildDir.get().asFile

    override fun onFinish(event: FinishEvent) {

            .filter(p -> p.getExtensions().findByType(TestFixtureExtension.class) != null)
            .map(project -> project.getExtensions().getByType(TestFixtureExtension.class))
            .flatMap(ext -> ext.serviceToProjectUseMap.entrySet().stream())
            .filter(entry -> entry.getKey().equals(serviceName))
            .map(Map.Entry::getValue)
            .findAny();
    }

        return buildProjectClassTimes[testCoverageId] ?: if (testCoverage.testType == TestType.SOAK) {
            null
        } else {
            val testCoverages = model.stages.flatMap { it.functionalTests }
            val foundTestCoverage =
                testCoverages.firstOrNull {
                    it.testType == TestType.PLATFORM &&
                        it.os == testCoverage.os &&

    public Type require(String id) {
        requireNonNull(id, "id cannot be null");
        return usedTypes.computeIfAbsent(id, i -> {
            Type type = lookup.lookupList(TypeProvider.class).stream()
                    .flatMap(p -> p.provides().stream())
                    .filter(t -> Objects.equals(id, t.id()))
                    .findFirst()
                    .orElse(null);
            if (type == null) {

        String id = id(requireNonNull(artifact, "artifact cannot be null"));
        if (session.getMavenSession().getAllProjects() != null) {
            session.getMavenSession().getAllProjects().stream()
                    .flatMap(this::getProjectArtifacts)
                    .filter(a -> Objects.equals(id, id(a)))
                    .forEach(a -> a.setFile(path != null ? path.toFile() : null));
        }
        if (path == null) {

        }
    }
}


fun FileSystemOperations.removeCachedScripts(cachesDir: File) {
    if (cachesDir.isDirectory) {
        cachesDir.listFiles()
            .filter { it.isDirectory }
            .flatMap { scriptsCacheDirsUnder(it) }
            .forEach { scriptsCacheDir ->
                logger.lifecycle("Removing scripts cache directory : $scriptsCacheDir")
                delete { delete(scriptsCacheDir) }
            }

    }

    public void executeBefore(BuildStep stepToExecuteAfter) {
        stepToExecuteAfter.executeAfter(this);
    }

    public Stream<MojoExecution> executions() {
        return mojos.values().stream().flatMap(m -> m.values().stream());
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {