@JsonIgnore
        public boolean isNotAssignedTo(final RegisteredService service, final Predicate<String> valueFilter) {
            if (service == null || !service.getProperties().containsKey(getPropertyName())) {
                return true;
            }
            val property = service.getProperties().get(getPropertyName());
            return property == null || property.getValues().isEmpty() || property.getValues().stream().noneMatch(valueFilter);
        }
Is not assigned to boolean.

@param service     the service
@param valueFilter the value filter
@return true or false
api/cas-server-core-api-services/src/main/java/org/apereo/cas/services/RegisteredServiceProperty.java