/**
* @param Field $field
* @param UniqueArrayObject $data
* @param Builder $builder
* @return mixed
* @throws SampleException
*/
private function sampleUniqueField(Field $field, UniqueArrayObject $data, Builder $builder)
{
// create a generation store for unique values
if ($field->isType(Field::TYPE_LINK)) {
// For links we only want uniqueness within the current object
// For unique relations with other objects across all samples a relation should be used.
$id = spl_object_hash($field) . $data->getId();
} else {
$id = spl_object_hash($field);
}
if (!isset($this->sampled[$id])) {
$this->sampled[$id] = [];
}
// try to iteratively generate a unique value
$rounds = 0;
do {
if ($rounds === $this->unique_tries) {
$name = $field->getName();
$type = $builder->getType();
throw new SampleException("Tried to get unique value for field {$name} in {$type}, but none could be generated");
}
$value = $this->sampleField($field, $data);
$rounds += 1;
} while (in_array($value, $this->sampled[$id], true));
// store the generated value for later testing
$this->sampled[$id][] = $value;
return $value;
}
