/**
* @param SnakList $qualifiers
* @param Summary|null $summary
*
* @throws ChangeOpException
*/
protected function removeQualifier(SnakList $qualifiers, Summary $summary = null)
{
if (!$qualifiers->hasSnakHash($this->snakHash)) {
throw new ChangeOpException("Qualifier with hash {$this->snakHash} does not exist");
}
$removedQualifier = $qualifiers->getSnak($this->snakHash);
$qualifiers->removeSnakHash($this->snakHash);
$this->updateSummary($summary, 'remove', '', $this->getSnakSummaryArgs($removedQualifier));
}
/**
* @since 0.4
*
* @param SnakList $qualifiers
* @param Summary $summary
*
* @throws ChangeOpException
*/
protected function setQualifier(SnakList $qualifiers, Summary $summary = null)
{
if (!$qualifiers->hasSnakHash($this->snakHash)) {
throw new ChangeOpException("Qualifier with hash {$this->snakHash} does not exist");
}
if ($qualifiers->hasSnak($this->snak)) {
throw new ChangeOpException('The statement has already a qualifier with hash ' . $this->snak->getHash());
}
$qualifiers->removeSnakHash($this->snakHash);
$qualifiers->addSnak($this->snak);
$this->updateSummary($summary, 'update', '', $this->getSnakSummaryArgs($this->snak));
}