if (patterns.isEmpty()) {
            return include ? Specs.satisfyAll() : Specs.satisfyNone();
        }

        PatternMatcher matcher = PatternMatcherFactory.getPatternsMatcher(include, caseSensitive, patterns);

        return new RelativePathSpec(matcher);
    }

    private enum CaseSensitivity {
        CASE_SENSITIVE(true),
        CASE_INSENSITIVE(false);

        if (!patterns.iterator().hasNext()) {
            throw new InvalidUserDataException("must provide at least one pattern to match");
        }
        PatternMatcher matcher = PatternMatcherFactory.getPatternsMatcher(true, isCaseSensitive(), patterns);
        return eachFile(new MatchingCopyAction(matcher, action));
    }

    @Override