/**
* @inheritdoc
*/
public function compare(DeltaInterface $version1, DeltaInterface $version2)
{
return strcmp($version1->getId(), $version2->getId());
}
/**
* @inheritdoc
*/
public function validate(DeltaInterface $version)
{
return !empty($version->getId());
// basically: any DeltaInterface is valid for this collection
}
/**
* @inheritdoc
*/
public function delete(DeltaInterface $version)
{
return $this->mapper->delete($version->getId());
}
/**
* {@inheritDoc}
*/
public function add(DeltaInterface $value)
{
$key = $value->getId()->toString();
if ($this->contains($key)) {
throw new AlreadyExistsException(sprintf('Element with key "%s" already exists. Remove it first or use replace() if you want to overwrite it.', $key));
}
$this->elements[$key] = $value;
return true;
}
