public function singleDiff($old_revision, Entity $new_revision)
{
// Get rid of extra indexes.
if ($old_revision !== null) {
$old_revision->cleanLoad();
$new_revision->cleanLoad();
} else {
$new_revision->cleanNew();
}
// Run the entities through the resolver.
if ($old_revision !== null) {
$old_revision = clone $old_revision->definition;
}
$new_resolver = new Resolver($new_revision, false);
$new_revision_object = clone $new_revision->definition;
if ($old_revision !== null) {
$old_revision_array = (array) $old_revision;
} else {
$old_revision_array = array();
}
$new_revision_array = (array) $new_revision_object;
$additions = drupal_array_diff_assoc_recursive($new_revision_array, $old_revision_array);
$deletions = $this->findToDelete($new_revision_array, $old_revision_array);
// Pull in properties that don't support revisions on the node.
$this->preserveUnchangingProperties($new_revision, $additions);
// Resolve the additions.
$new_resolver->resolveDependencies(false, $additions);
$additions = $new_resolver->resolvedDefinition();
return array('additions' => $additions, 'deletions' => $deletions);
}