.resolve(string.substring(2))
                    .normalize()
                    .toAbsolutePath();
        } else {
            // resolve based on $CWD
            return Paths.get(string).normalize().toAbsolutePath();
        }
    }

    private VersionFilter buildVersionFilter(String filterExpression) {

        Model model = builder.build(session, project, src);
        write(model, tgt);
    }

    private void deferDeleteFile(Path generatedFile) {
        toDelete.add(generatedFile.toAbsolutePath());
    }

    @PreDestroy
    private void doDeleteFiles() {
        for (Path file : toDelete) {
            try {
                Files.delete(file);
            } catch (IOException e) {

        assertArgumentNotNull("pathToCheck", pathToCheck);
        assertArgumentNotNull("baseDirectory", baseDirectory);

        final Path normalizedPath = pathToCheck.toAbsolutePath().normalize();
        final Path normalizedBase = baseDirectory.toAbsolutePath().normalize();
        return normalizedPath.startsWith(normalizedBase);
    }

    /**
     * Validates that a given file is safe and does not attempt path traversal attacks.

    }
  }

  public void testCreateParentDirectories_relativePath() throws IOException {
    Path path = FS.getPath("nonexistent.file");
    assertThat(path.getParent()).isNull();
    assertThat(path.toAbsolutePath().getParent()).isNotNull();
    MoreFiles.createParentDirectories(path); // test that there's no exception
  }

  public void testCreateParentDirectories_noParentsNeeded() throws IOException {

    }
  }

  public void testCreateParentDirectories_relativePath() throws IOException {
    Path path = FS.getPath("nonexistent.file");
    assertThat(path.getParent()).isNull();
    assertThat(path.toAbsolutePath().getParent()).isNotNull();
    MoreFiles.createParentDirectories(path); // test that there's no exception
  }

  public void testCreateParentDirectories_noParentsNeeded() throws IOException {