/**
* Compare two versions.
*
* @param PageVersion $new
* @param PageVersion $old
*
* @return Diff\BaseChange
*/
public function compare(PageVersion $new, PageVersion $old)
{
if ($new->getRestoredVersionId()) {
return new Diff\RestoredVersion($new, $old);
}
if ($new->isContentChange()) {
return new Diff\ChunkChange($new, $old);
}
if ($new->getTemplateId() !== $old->getTemplateId()) {
return new Diff\TemplateChange($new, $old);
}
if (strcmp($new->getTitle(), $old->getTitle()) !== 0) {
return new Diff\TitleChange($new, $old);
}
if ($new->isPendingApproval() && !$old->isPendingApproval()) {
return new Diff\ApprovalRequest($new, $old);
}
if ($new->isEmbargoed($new->getEditedTime())) {
if (!$old->isEmbargoed($old->getEditedTime())) {
return new Diff\Embargoed($new, $old);
}
if ($new->getEmbargoedUntil()->getTimestamp() !== $old->getEmbargoedUntil()->getTimestamp()) {
return new Diff\EmbargoChanged($new, $old);
}
}
if ($new->isPublished($new->getEditedTime())) {
if (!$old->isPublished($old->getEditedTime())) {
return new Diff\Published($new, $old);
}
}
}