cog/Spotlight/SpotlightPlaylistEntry.m

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//
// SpotlightPlaylistEntry.m
// Cog
//
// Created by Matthew Grinshpun on 11/02/08.
// Copyright 2008 Matthew Leon Grinshpun. All rights reserved.
//
#import "SpotlightPlaylistEntry.h"
// dictionary that lets us translate from and mdKey to an entryKey
// if we need the help of a transformer, we use an nsarray
// with format (entryKey, transformerName)
static NSDictionary *importKeys;
extern NSLock *kPersistentContainerLock;
extern NSPersistentContainer *kPersistentContainer;
@implementation SpotlightPlaylistEntry
+ (void)initialize {
// We need to translate the path string to a full URL
NSArray *URLTransform =
@[@"url", @"PathToURLTransformer"];
// Extract the artist name from the authors array
NSArray *artistTransform =
@[@"artist", @"AuthorToArtistTransformer"];
importKeys = @{ @"kMDItemTitle": @"title",
@"kMDItemAlbum": @"album",
@"kMDItemAudioTrackNumber": @"track",
@"kMDItemRecordingYear": @"year",
@"kMDItemMusicalGenre": @"genre",
@"kMDItemDurationSeconds": @"length",
@"kMDItemPath": URLTransform,
@"kMDItemAuthors": artistTransform };
}
+ (PlaylistEntry *)playlistEntryWithMetadataItem:(NSMetadataItem *)metadataItem {
[kPersistentContainerLock lock];
PlaylistEntry *entry = [NSEntityDescription insertNewObjectForEntityForName:@"PlaylistEntry" inManagedObjectContext:kPersistentContainer.viewContext];
entry.deLeted = YES;
NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];
// loop through the keys we want to extract
for(NSString *mdKey in importKeys) {
if(![metadataItem valueForAttribute:mdKey]) continue;
id importTarget = [importKeys objectForKey:mdKey];
// Just copy the object from metadata
if([importTarget isKindOfClass:[NSString class]]) {
if([importTarget isEqualToString:@"length"]) {
// fake it
NSNumber *number = [metadataItem valueForAttribute:mdKey];
[dict setValue:@(44100.0) forKey:@"samplerate"];
[dict setValue:@(44100.0 * [number doubleValue]) forKey:@"totalFrames"];
} else {
[dict setValue:[metadataItem valueForAttribute:mdKey]
forKey:importTarget];
}
}
// Transform the value in metadata before copying it in
else if([importTarget isKindOfClass:[NSArray class]]) {
NSString *importKey = [importTarget objectAtIndex:0];
NSValueTransformer *transformer =
[NSValueTransformer valueTransformerForName:[importTarget objectAtIndex:1]];
id transformedValue = [transformer transformedValue:
[metadataItem valueForAttribute:mdKey]];
[dict setValue:transformedValue forKey:importKey];
}
// The importKeys dictionary contains something strange...
else {
NSString *errString =
[NSString stringWithFormat:@"ERROR: Could not import key %@", mdKey];
NSAssert(NO, errString);
}
}
NSURL *url = [dict objectForKey:@"url"];
[dict removeObjectForKey:@"url"];
entry.url = url;
[entry setMetadata:dict];
[kPersistentContainerLock unlock];
return entry;
}
@end