/** Check if given entity is attached. */
public static boolean isAttached(final Entity entity) {
return EntityHelper.metadata(entity) instanceof AttachedEntityMetadata;
}
/** Returns attached metadata of entity. */
public static AttachedEntityMetadata metadata(final Entity entity) {
EntityMetadata metadata = EntityHelper.metadata(entity);
checkState(metadata instanceof AttachedEntityMetadata, "Entity not attached");
return (AttachedEntityMetadata) metadata;
}