public ValidationResult validate()

in src/main/java/org/apache/nifi/processor/util/StandardValidators.java [816:842]
25 lines of code
6 McCabe index (conditional complexity)

        public ValidationResult validate(final String subject, final String input, final ValidationContext context) {
            if (context.isExpressionLanguageSupported(subject) && context.isExpressionLanguagePresent(input)) {
                return new ValidationResult.Builder().subject(subject).input(input).explanation("Expression Language Present").valid(true).build();
            }

            if (input == null) {
                return new ValidationResult.Builder().subject(subject).input(input).valid(false).explanation("Time Period cannot be null").build();
            }
            final String lowerCase = input.toLowerCase();
            final boolean validSyntax = pattern.matcher(lowerCase).matches();
            final ValidationResult.Builder builder = new ValidationResult.Builder();
            if (validSyntax) {
                final long nanos = DurationFormat.getTimeDuration(lowerCase, TimeUnit.NANOSECONDS);

                if (nanos < minNanos || nanos > maxNanos) {
                    builder.subject(subject).input(input).valid(false)
                            .explanation("Must be in the range of " + minValueEnglish + " to " + maxValueEnglish);
                } else {
                    builder.subject(subject).input(input).valid(true);
                }
            } else {
                builder.subject(subject).input(input).valid(false)
                        .explanation("Must be of format <duration> <TimeUnit> where <duration> is a non-negative "
                                + "integer and TimeUnit is a supported Time Unit, such as: nanos, millis, secs, mins, hrs, days");
            }
            return builder.build();
        }