public ValidationResult validate()

in src/main/java/org/apache/nifi/processor/util/StandardValidators.java [860:885]

• 24 lines of code
• 8 McCabe index (conditional complexity)

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

            final String substituted;
            if (allowEL) {
                try {
                    substituted = context.newPropertyValue(value).evaluateAttributeExpressions().getValue();
                } catch (final Exception e) {
                    return new ValidationResult.Builder().subject(subject).input(value).valid(false)
                            .explanation("Not a valid Expression Language value: " + e.getMessage()).build();
                }
            } else {
                substituted = value;
            }

            final File file = new File(substituted);
            if (!file.exists()) {
                return new ValidationResult.Builder().subject(subject).input(value).valid(false).explanation("File " + file + " does not exist").build();
            }
            if (allowFileOnly && !file.isFile()) {
                return new ValidationResult.Builder().subject(subject).input(value).valid(false).explanation(file + " is not a file").build();
            }
            return new ValidationResult.Builder().subject(subject).input(value).valid(true).build();
        }