/**
* Performs the retrieve function.
*
* @param ctx query context
* @return {@code null}
* @throws QueryException query exception
*/
private B64Stream retrieve(final QueryContext ctx) throws QueryException {
final Data data = data(0, ctx);
final String path = path(1, ctx);
final IOFile file = data.meta.binary(path);
if (file == null || !file.exists() || file.isDir()) RESFNF.thrw(input, path);
return new B64Stream(file, DBERR);
}
/**
* Performs the content-type function.
*
* @param ctx query context
* @return result
* @throws QueryException query exception
*/
private Str contentType(final QueryContext ctx) throws QueryException {
final Data data = data(0, ctx);
final String path = path(1, ctx);
if (data.resources.doc(path) != -1) return Str.get(MimeTypes.APP_XML);
final IOFile io = data.meta.binary(path);
if (!io.exists() || io.isDir()) RESFNF.thrw(input, path);
return Str.get(MimeTypes.get(path));
}