73 lines
1.7 KiB
Objective-C
73 lines
1.7 KiB
Objective-C
//
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// RedundantPlaylistDataStore.m
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// Cog
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//
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// Created by Christopher Snowhill on 2/16/22.
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//
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// Coalesce an entryInfo dictionary from tag loading into a common data dictionary, to
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// reduce the memory footprint of adding a lot of tracks to the playlist.
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#import "RedundantPlaylistDataStore.h"
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#import "SHA256Digest.h"
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@implementation RedundantPlaylistDataStore
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- (id)init {
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self = [super init];
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if(self) {
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stringStore = [[NSMutableArray alloc] init];
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artStore = [[NSMutableDictionary alloc] init];
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}
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return self;
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}
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- (NSString *)coalesceString:(NSString *)in {
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if(in == nil) return in;
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NSUInteger index = [stringStore indexOfObject:in];
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if(index == NSNotFound) {
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[stringStore addObject:in];
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return in;
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} else {
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return [stringStore objectAtIndex:index];
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}
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}
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- (NSData *)coalesceArt:(NSData *)in {
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if(in == nil) return in;
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NSString *key = [SHA256Digest digestDataAsString:in];
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NSData *ret = [artStore objectForKey:key];
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if(ret == nil) {
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[artStore setObject:in forKey:key];
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return in;
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} else {
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return ret;
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}
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}
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- (NSDictionary *)coalesceEntryInfo:(NSDictionary *)entryInfo {
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__block NSMutableDictionary *ret = [[NSMutableDictionary alloc] initWithCapacity:[entryInfo count]];
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[entryInfo enumerateKeysAndObjectsUsingBlock:^(id _Nonnull key, id _Nonnull obj, BOOL *_Nonnull stop) {
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if([obj isKindOfClass:[NSString class]]) {
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NSString *stringObj = (NSString *)obj;
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[ret setObject:[self coalesceString:stringObj] forKey:key];
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} else if([obj isKindOfClass:[NSData class]]) {
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NSData *dataObj = (NSData *)obj;
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[ret setObject:[self coalesceArt:dataObj] forKey:key];
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} else {
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[ret setObject:obj forKey:key];
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}
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}];
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return [NSDictionary dictionaryWithDictionary:ret];
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}
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@end
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