public static Field getIdField()

in src/main/java/com/microsoft/spring/data/gremlin/common/GremlinUtils.java [57:89]
28 lines of code
10 McCabe index (conditional complexity)

    public static <T> Field getIdField(@NonNull Class<T> domainClass) {
        final Field idField;
        final List<Field> idFields = FieldUtils.getFieldsListWithAnnotation(domainClass, Id.class);
        final List<Field> generatedValueFields =
                FieldUtils.getFieldsListWithAnnotation(domainClass, GeneratedValue.class);

        if (generatedValueFields.size() > 1) {
            throw new GremlinIllegalConfigurationException("Only one field, the id field, can have the optional "
                    + "@GeneratedValue annotation!");
        }

        if (idFields.isEmpty()) {
            idField = ReflectionUtils.findField(domainClass, Constants.PROPERTY_ID);
        } else if (idFields.size() == 1) {
            idField = idFields.get(0);
        } else {
            throw new GremlinInvalidEntityIdFieldException("only one @Id field is allowed");
        }

        if (idField == null) {
            throw new GremlinInvalidEntityIdFieldException("no field named id in class");
        } else if (idField.getType() != String.class
                && idField.getType() != Long.class && idField.getType() != Integer.class) {
            throw new GremlinInvalidEntityIdFieldException("the type of @Id/id field should be String/Integer/Long");
        }

        if (generatedValueFields.size() == 1 && !generatedValueFields.get(0).equals(idField)) {
            throw new GremlinIllegalConfigurationException("Only the id field can have the optional "
                    + "@GeneratedValue annotation!");
        }

        return idField;
    }