/**
* Returns true if the specified version is valid (can be added) to the collection. Otherwise, it MUST throw
* an exception.
*
* @param DeltaInterface $version
*
* @return bool
*
* @throws CollectionException
*/
public function validate(DeltaInterface $version)
{
if (!$version->isMigrated()) {
throw new CollectionException('Invalid version specified: this collection only accepts deltas that are migrated.');
}
return parent::validate($version);
}
/**
* @inheritdoc
*/
public final function update(DeltaInterface $version)
{
if ($version->isMigrated()) {
$result = $this->save($version);
} else {
$result = $this->delete($version);
}
return $result;
}
/**
* Returns true if the operation is forced, or if the direction is the opposite to the state of the migration.
*
* @param DeltaInterface $version
* @param OptionsInterface $options
*
* @return bool
*/
protected function shouldMigrate(DeltaInterface $version, OptionsInterface $options)
{
return $options->isForced() || $options->getDirection()->isUp() ^ $version->isMigrated();
// direction is opposite to state
}