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;
@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"];
// Track numbers must sometimes be converted from NSNumber to NSString
NSArray *trackTransform =
@[@"spotlightTrack", @"NumberToStringTransformer"];
importKeys = @{@"kMDItemTitle": @"title",
@"kMDItemAlbum": @"album",
@"kMDItemAudioTrackNumber": trackTransform,
@"kMDItemRecordingYear": @"year",
@"kMDItemMusicalGenre": @"genre",
@"kMDItemDurationSeconds": @"length",
@"kMDItemPath": URLTransform,
@"kMDItemAuthors": artistTransform};
}
+ (SpotlightPlaylistEntry *)playlistEntryWithMetadataItem:(NSMetadataItem *)metadataItem {
SpotlightPlaylistEntry *entry = [[SpotlightPlaylistEntry alloc] init];
// loop through the keys we want to extract
for(NSString *mdKey in importKeys) {
id importTarget = [importKeys objectForKey:mdKey];
// Just copy the object from metadata
if([importTarget isKindOfClass:[NSString class]]) {
[entry 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]];
[entry setValue:transformedValue forKey:importKey];
}
// The importKeys dictionary contains something strange...
else {
NSString *errString =
[NSString stringWithFormat:@"ERROR: Could not import key %@", mdKey];
NSAssert(NO, errString);
}
}
return entry;
}
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// Length is no longer a dependent key
+ (NSSet *)keyPathsForValuesAffectingLength {
return nil;
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}
- (void)dealloc {
self.length = nil;
self.spotlightTrack = nil;
}
@synthesize length;
@synthesize spotlightTrack;
@end