//
// - performSearchOperation:
//
- (void) performSearchOperation:(HGSCallbackSearchOperation *)operation
{
    HGSQuery * query = [operation query];
    NSString * queryString = [[query tokenizedQueryString] originalString];

    if (!(search_ = [[JKPSpotifySearch alloc] initWithQuery:queryString]))
    {
        [operation finishQuery];
        return;
    }

    [search_ beginSearchWithCompletionHandler:
        ^(NSDictionary * results, NSError * error)
    {
        if ([operation isCancelled])
            return;

        if (error != nil)
            NSLog(@"Spotify query failed: %@",
                [[error userInfo] valueForKey:kJKPSpotifySearchErrorReasonKey]);
        else
            [operation setRankedResults:[self processResults:results
                                                    forQuery:query]];
        [operation finishQuery];
    }];
}