/**
* The creation time of a deterministic key is equal to that of its parent, unless this key is the
* root of a tree. Thus, setting the creation time on a leaf is forbidden.
*/
@Override
public void setCreationTimeSeconds(long newCreationTimeSeconds) {
if (parent != null)
throw new IllegalStateException("Creation time can only be set on root keys.");
else super.setCreationTimeSeconds(newCreationTimeSeconds);
}
