3663140064
All concurrency from other threads should pass through the viewContext's performBlock or performBlockAndWait functions, and no other way. So now, all access to Core Data is either happening on the main thread, or by using these code blocks, all of which will wait for their access to proceed. Signed-off-by: Christopher Snowhill <kode54@gmail.com>
92 lines
3 KiB
Objective-C
92 lines
3 KiB
Objective-C
//
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// SpotlightPlaylistEntry.m
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// Cog
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//
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// Created by Matthew Grinshpun on 11/02/08.
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// Copyright 2008 Matthew Leon Grinshpun. All rights reserved.
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//
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#import "SpotlightPlaylistEntry.h"
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// dictionary that lets us translate from and mdKey to an entryKey
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// if we need the help of a transformer, we use an nsarray
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// with format (entryKey, transformerName)
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static NSDictionary *importKeys;
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extern NSPersistentContainer *kPersistentContainer;
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@implementation SpotlightPlaylistEntry
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+ (void)initialize {
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// We need to translate the path string to a full URL
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NSArray *URLTransform =
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@[@"url", @"PathToURLTransformer"];
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// Extract the artist name from the authors array
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NSArray *artistTransform =
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@[@"artist", @"AuthorToArtistTransformer"];
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importKeys = @{ @"kMDItemTitle": @"title",
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@"kMDItemAlbum": @"album",
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@"kMDItemAudioTrackNumber": @"track",
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@"kMDItemRecordingYear": @"year",
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@"kMDItemMusicalGenre": @"genre",
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@"kMDItemDurationSeconds": @"length",
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@"kMDItemPath": URLTransform,
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@"kMDItemAuthors": artistTransform };
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}
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+ (PlaylistEntry *)playlistEntryWithMetadataItem:(NSMetadataItem *)metadataItem {
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__block PlaylistEntry *entry = nil;
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[kPersistentContainer.viewContext performBlockAndWait:^{
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entry = [NSEntityDescription insertNewObjectForEntityForName:@"PlaylistEntry" inManagedObjectContext:kPersistentContainer.viewContext];
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entry.deLeted = YES;
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NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];
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// loop through the keys we want to extract
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for(NSString *mdKey in importKeys) {
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if(![metadataItem valueForAttribute:mdKey]) continue;
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id importTarget = [importKeys objectForKey:mdKey];
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// Just copy the object from metadata
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if([importTarget isKindOfClass:[NSString class]]) {
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if([importTarget isEqualToString:@"length"]) {
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// fake it
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NSNumber *number = [metadataItem valueForAttribute:mdKey];
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[dict setValue:@(44100.0) forKey:@"samplerate"];
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[dict setValue:@(44100.0 * [number doubleValue]) forKey:@"totalFrames"];
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} else {
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[dict setValue:[metadataItem valueForAttribute:mdKey]
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forKey:importTarget];
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}
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}
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// Transform the value in metadata before copying it in
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else if([importTarget isKindOfClass:[NSArray class]]) {
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NSString *importKey = [importTarget objectAtIndex:0];
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NSValueTransformer *transformer =
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[NSValueTransformer valueTransformerForName:[importTarget objectAtIndex:1]];
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id transformedValue = [transformer transformedValue:
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[metadataItem valueForAttribute:mdKey]];
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[dict setValue:transformedValue forKey:importKey];
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}
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// The importKeys dictionary contains something strange...
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else {
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NSString *errString =
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[NSString stringWithFormat:@"ERROR: Could not import key %@", mdKey];
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NSAssert(NO, errString);
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}
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}
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NSURL *url = [dict objectForKey:@"url"];
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[dict removeObjectForKey:@"url"];
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entry.url = url;
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[entry setMetadata:dict];
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}];
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return entry;
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}
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@end
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