/**
     * The pattern for time.
     */
    protected String pattern;

    /**
     * Constructs an instance.
     *
     * @param pattern
     *            the pattern for time
     */
    public TimeConverter(final String pattern) {
        assertArgumentNotEmpty("pattern", pattern);
        this.pattern = pattern;
    }

    @Override

  private final Pattern pattern;

  /**
   * Constructs a pattern file name filter object.
   *
   * @param patternStr the pattern string on which to filter file names
   * @throws PatternSyntaxException if pattern compilation fails (runtime)
   */
  public PatternFilenameFilter(String patternStr) {
    this(Pattern.compile(patternStr));
  }

  /**

     * @param pattern
     *            The pattern string
     * @return The converted {@literal String}
     */
    public static String toString(final Object value, final String pattern) {
        return switch (value) {
        case null -> null;
        case String s -> s;
        case java.util.Date d -> toString(d, pattern);
        case Number n -> toString(n, pattern);

        }
    }

    /**
     * Converts a pattern string to a plain pattern string without delimiters.
     *
     * @param pattern
     *            The pattern string.
     * @return The plain pattern string without delimiters.
     */
    protected static String toPlainPattern(final String pattern) {
        final StringBuilder buf = new StringBuilder(pattern.length());
        for (int i = 0; i < pattern.length(); ++i) {

        }
    }

    /**
     * Converts the pattern string to a plain pattern string without delimiters.
     *
     * @param pattern
     *            The pattern string.
     * @return The plain pattern string without delimiters.
     */
    protected static String toPlainPattern(final String pattern) {
        final StringBuilder buf = new StringBuilder(pattern.length());
        for (int i = 0; i < pattern.length(); ++i) {

    /**
     * The pattern for the date and time.
     */
    protected String pattern;

    /**
     * Constructs an instance.
     *
     * @param pattern
     *            the pattern for date and time
     */
    public TimestampConverter(final String pattern) {
        assertArgumentNotEmpty("pattern", pattern);
        this.pattern = pattern;
    }

    @Override

    init {
      require(
        (pattern.startsWith("*.") && pattern.indexOf("*", 1) == -1) ||
          (pattern.startsWith("**.") && pattern.indexOf("*", 2) == -1) ||
          pattern.indexOf("*") == -1,
      ) {
        "Unexpected pattern: $pattern"
      }

      this.pattern =
        pattern.toCanonicalHost() ?: throw IllegalArgumentException("Invalid pattern: $pattern")

      when {

    /**
     * The pattern for numbers.
     */
    protected String pattern;

    /**
     * Constructs an instance.
     *
     * @param pattern
     *            the pattern for numbers
     */
    public NumberConverter(final String pattern) {
        assertArgumentNotEmpty("pattern", pattern);
        this.pattern = pattern;
    }

    @Override

type Rules map[string]TargetIDSet

// Add - adds pattern and target ID.
func (rules Rules) Add(pattern string, targetID TargetID) {
	rules[pattern] = NewTargetIDSet(targetID).Union(rules[pattern])
}

// MatchSimple - returns true one of the matching object name in rules.
func (rules Rules) MatchSimple(objectName string) bool {
	for pattern := range rules {
		if wildcard.MatchSimple(pattern, objectName) {
			return true
		}
	}

     */
    public CopyOptions dateConverter(final String pattern, final CharSequence... propertyNames) {
        assertArgumentNotEmpty("pattern", pattern);

        return converter(new DateConverter(pattern), propertyNames);
    }

    /**
     * Sets a converter for SQL dates.
     *
     * @param pattern
     *            The date pattern. Must not be {@literal null} or an empty string.