private SortedMap deleteAllFilesAndDirectories()

in junit-jupiter-engine/src/main/java/org/junit/jupiter/engine/extension/TempDirectory.java [186:252]
59 lines of code
9 McCabe index (conditional complexity)

		private SortedMap<Path, IOException> deleteAllFilesAndDirectories() throws IOException {
			if (Files.notExists(dir)) {
				return Collections.emptySortedMap();
			}

			SortedMap<Path, IOException> failures = new TreeMap<>();
			Files.walkFileTree(dir, new SimpleFileVisitor<Path>() {

				@Override
				public FileVisitResult visitFile(Path file, BasicFileAttributes attributes) {
					return deleteAndContinue(file);
				}

				@Override
				public FileVisitResult postVisitDirectory(Path dir, IOException exc) {
					return deleteAndContinue(dir);
				}

				private FileVisitResult deleteAndContinue(Path path) {
					try {
						Files.delete(path);
					}
					catch (NoSuchFileException ignore) {
						// ignore
					}
					catch (DirectoryNotEmptyException exception) {
						failures.put(path, exception);
					}
					catch (IOException exception) {
						makeWritableAndTryToDeleteAgain(path, exception);
					}
					return CONTINUE;
				}

				private void makeWritableAndTryToDeleteAgain(Path path, IOException exception) {
					try {
						tryToMakeParentDirsWritable(path);
						makeWritable(path);
						Files.delete(path);
					}
					catch (Exception suppressed) {
						exception.addSuppressed(suppressed);
						failures.put(path, exception);
					}
				}

				private void tryToMakeParentDirsWritable(Path path) {
					Path relativePath = dir.relativize(path);
					Path parent = dir;
					for (int i = 0; i < relativePath.getNameCount(); i++) {
						boolean writable = parent.toFile().setWritable(true);
						if (!writable) {
							break;
						}
						parent = parent.resolve(relativePath.getName(i));
					}
				}

				private void makeWritable(Path path) {
					boolean writable = path.toFile().setWritable(true);
					if (!writable) {
						throw new UndeletableFileException("Attempt to make file '" + path + "' writable failed");
					}
				}
			});
			return failures;
		}