85 lines
2.5 KiB
Objective-C
85 lines
2.5 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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@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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// Track numbers must sometimes be converted from NSNumber to NSString
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NSArray *trackTransform =
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@[@"spotlightTrack", @"NumberToStringTransformer"];
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importKeys = @{@"kMDItemTitle": @"title",
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@"kMDItemAlbum": @"album",
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@"kMDItemAudioTrackNumber": trackTransform,
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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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+ (SpotlightPlaylistEntry *)playlistEntryWithMetadataItem:(NSMetadataItem *)metadataItem {
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SpotlightPlaylistEntry *entry = [[SpotlightPlaylistEntry 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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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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[entry setValue:[metadataItem valueForAttribute:mdKey]
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forKey:importTarget];
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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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[entry 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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return entry;
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}
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// Length is no longer a dependent key
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+ (NSSet *)keyPathsForValuesAffectingLength {
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return nil;
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}
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- (void)dealloc {
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self.length = nil;
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self.spotlightTrack = nil;
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}
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@synthesize length;
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@synthesize spotlightTrack;
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@end
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