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 =
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[NSArray arrayWithObjects:@"URL", @"PathToURLTransformer", nil];
// Extract the artist name from the authors array
NSArray *artistTransform =
[NSArray arrayWithObjects:@"artist", @"AuthorToArtistTransformer", nil];
// Track numbers must sometimes be converted from NSNumber to NSString
NSArray *trackTransform =
[NSArray arrayWithObjects:@"spotlightTrack", @"NumberToStringTransformer", nil];
importKeys = [NSDictionary dictionaryWithObjectsAndKeys:
@"title", @"kMDItemTitle",
@"album", @"kMDItemAlbum",
trackTransform, @"kMDItemAudioTrackNumber",
@"year", @"kMDItemRecordingYear",
@"genre", @"kMDItemMusicalGenre",
@"length", @"kMDItemDurationSeconds",
URLTransform, @"kMDItemPath",
artistTransform, @"kMDItemAuthors",
nil];
}
+ (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]];
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[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