}
    },
    INPUT_DIRECTORY_VALIDATOR("directory") {
        @Override
        public void doValidate(String propertyName, Object value, PropertyValidationContext context) {
            File directory = toDirectory(context, value);
            if (!directory.exists()) {
                reportMissingInput(context, "Directory", propertyName, directory);
            } else if (!directory.isDirectory()) {

                } else if (Files.isRegularFile(path)) {
                    topDirectory = path.getParent();
                    if (!Files.isDirectory(topDirectory)) {
                        System.err.println("Directory " + topDirectory
                                + " extracted from the -f/--file command-line argument " + arg + " does not exist");
                        throw new ExitException(1);

                Path current = currentPom.toPath().toAbsolutePath().normalize();
                Path topDirectory = session.getTopDirectory();
                if (topDirectory != null && current.startsWith(topDirectory)) {
                    current = topDirectory.relativize(current);
                }
                logger.info("  from " + current);
            }

        return this;
    }

    @Override
    public Path getTopDirectory() {
        return topDirectory;
    }

    @Override
    public MavenExecutionRequest setTopDirectory(Path topDirectory) {
        this.topDirectory = topDirectory;
        return this;
    }

    @Override

                } else {
                    Path topDirectory = mavenSession.getTopDirectory();
                    Path locationPath = Paths.get(location).toAbsolutePath().normalize();
                    if (locationPath.startsWith(topDirectory)) {
                        locationPath = topDirectory.relativize(locationPath);
                    }

                    "-DvalTopDirectory=${session.topDirectory}/pom.xml",
                    "-f",
                    "${session.rootDirectory}/my-child",
                    "prefix:3.0.0:${foo}",
                    "validate"
                },
                null);
        request.rootDirectory = Paths.get("myRootDirectory");
        request.topDirectory = Paths.get("myTopDirectory");

        // Act