/*
This method normalizes a link to an "links object". If the passed link is
already an object it's returned without any modifications.
See http://jsonapi.org/format/#document-links for more information.
@method _normalizeLink
@private
@param {String} link
@return {Object|null}
@for DS
*/
export default function _normalizeLink(link) {
switch (typeof link) {
case 'object': return link;
case 'string': return { href: link };
}
return null;
}