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+//
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+// VLCMediaFileDiscoverer.m
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+// VLC for iOS
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+//
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+// Created by Gleb on 7/27/13.
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+// Copyright (c) 2013 VideoLAN. All rights reserved.
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+//
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+// Refer to the COPYING file of the official project for license.
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+//
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+
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+#import "VLCMediaFileDiscoverer.h"
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+#import "DirectoryWatcher.h"
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+#import "NSString+SupportedMedia.h"
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+
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+const float MediaTimerInterval = 2.f;
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+
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+@interface VLCMediaFileDiscoverer () <DirectoryWatcherDelegate> {
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+ NSMutableArray *_observers;
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+ DirectoryWatcher *_directoryWatcher;
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+
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+ NSString *_directoryPath;
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+ NSArray *_directoryFiles;
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+ NSMutableDictionary *_addedFilesMapping;
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+ NSTimer *_addMediaTimer;
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+}
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+
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+@end
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+
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+@implementation VLCMediaFileDiscoverer
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+
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+- (id)init
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+{
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+ self = [super init];
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+ if (self) {
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+ _observers = [NSMutableArray array];
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+ _addedFilesMapping = [NSMutableDictionary dictionary];
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+ }
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+
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+ return self;
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+}
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+
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++ (instancetype)sharedInstance
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+{
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+ static dispatch_once_t onceToken;
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+ static VLCMediaFileDiscoverer *instance;
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+ dispatch_once(&onceToken, ^{
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+ instance = [VLCMediaFileDiscoverer new];
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+ });
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+
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+ return instance;
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+}
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+
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+#pragma mark - observation
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+
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+- (void)addObserver:(id<VLCMediaFileDiscovererDelegate>)delegate
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+{
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+ [_observers addObject:delegate];
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+}
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+
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+- (void)removeObserver:(id<VLCMediaFileDiscovererDelegate>)delegate
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+{
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+ [_observers removeObject:delegate];
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+}
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+
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+- (void)notifyFileDeleted:(NSString *)fileName
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+{
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+ if (![fileName isSupportedMediaFormat])
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+ return;
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+
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+ for (id<VLCMediaFileDiscovererDelegate> delegate in _observers) {
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+ if ([delegate respondsToSelector:@selector(mediaFileDeleted:)]) {
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+ [delegate mediaFileDeleted:[self filePath:fileName]];
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+ }
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+ }
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+}
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+
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+- (void)notifyFileAdded:(NSString *)fileName loading:(BOOL)isLoading
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+{
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+ for (id<VLCMediaFileDiscovererDelegate> delegate in _observers) {
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+ if ([delegate respondsToSelector:@selector(mediaFileAdded:loading:)]) {
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+ [delegate mediaFileAdded:[self filePath:fileName] loading:isLoading];
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+ }
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+ }
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+}
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+
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+- (void)notifySizeChanged:(NSString *)fileName size:(unsigned long long)size
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+{
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+ for (id<VLCMediaFileDiscovererDelegate> delegate in _observers) {
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+ if ([delegate respondsToSelector:@selector(mediaFileChanged:size:)]) {
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+ [delegate mediaFileChanged:[self filePath:fileName] size:size];
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+ }
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+ }
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+}
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+
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+#pragma mark - discovering
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+
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+- (void)startDiscovering:(NSString *)directoryPath
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+{
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+ _directoryPath = directoryPath;
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+ _directoryFiles = [self directoryFiles];
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+
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+ _directoryWatcher = [DirectoryWatcher watchFolderWithPath:directoryPath delegate:self];
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+}
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+
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+- (void)stopDiscovering
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+{
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+ [_directoryWatcher invalidate];
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+ _directoryWatcher.delegate = nil;
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+
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+ [self invalidateTimer];
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+}
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+
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+#pragma mark -
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+
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+- (NSArray *)directoryFiles
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+{
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+ NSArray *foundFiles = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:_directoryPath error:nil];
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+
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+ return foundFiles;
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+}
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+
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+- (NSString *)filePath:(NSString *)fileName
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+{
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+ return [_directoryPath stringByAppendingPathComponent:fileName];
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+}
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+
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+#pragma mark - directory watcher delegate
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+
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+- (void)directoryDidChange:(DirectoryWatcher *)folderWatcher
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+{
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+ NSArray *foundFiles = [self directoryFiles];
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+
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+ if (_directoryFiles.count > foundFiles.count) { // File was deleted
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+ NSPredicate *filterPredicate = [NSPredicate predicateWithFormat:@"not (self in %@)", foundFiles];
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+ NSArray *deletedFiles = [_directoryFiles filteredArrayUsingPredicate:filterPredicate];
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+
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+ for (NSString *fileName in deletedFiles) {
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+ [self notifyFileDeleted:fileName];
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+ }
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+
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+ } else if (_directoryFiles.count < foundFiles.count) { // File was added
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+ NSPredicate *filterPredicate = [NSPredicate predicateWithFormat:@"not (self in %@)", _directoryFiles];
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+ NSArray *addedFiles = [foundFiles filteredArrayUsingPredicate:filterPredicate];
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+
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+ for (NSString *fileName in addedFiles) {
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+ if ([fileName isSupportedMediaFormat]) {
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+ [_addedFilesMapping setObject:@(0) forKey:fileName];
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+ [self notifyFileAdded:fileName loading:YES];
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+ }
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+ }
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+
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+ if (![_addMediaTimer isValid]) {
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+ _addMediaTimer = [NSTimer scheduledTimerWithTimeInterval:MediaTimerInterval
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+ target:self selector:@selector(addFileTimerFired)
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+ userInfo:nil repeats:YES];
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+ }
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+ }
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+
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+ _directoryFiles = foundFiles;
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+}
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+
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+#pragma mark - media timer
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+
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+- (void)addFileTimerFired
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+{
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+ NSArray *allKeys = [_addedFilesMapping allKeys];
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+ NSFileManager *fileManager = [NSFileManager defaultManager];
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+
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+ for (NSString *fileName in allKeys) {
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+ NSString *filePath = [self filePath:fileName];
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+ if (![fileManager fileExistsAtPath:filePath]) {
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+ [_addedFilesMapping removeObjectForKey:fileName];
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+ continue;
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+ }
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+
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+ NSNumber *prevFetchedSize = [_addedFilesMapping objectForKey:fileName];
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+
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+ NSDictionary *attribs = [fileManager attributesOfItemAtPath:filePath error:nil];
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+ NSNumber *updatedSize = [attribs objectForKey:NSFileSize];
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+ if (!updatedSize)
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+ continue;
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+
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+ [self notifySizeChanged:fileName size:[updatedSize unsignedLongLongValue]];
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+
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+ if ([prevFetchedSize compare:updatedSize] == NSOrderedSame) {
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+ [_addedFilesMapping removeObjectForKey:fileName];
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+ [self notifyFileAdded:fileName loading:NO];
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+
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+ } else
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+ [_addedFilesMapping setObject:updatedSize forKey:fileName];
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+ }
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+
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+ if (_addedFilesMapping.count == 0)
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+ [self invalidateTimer];
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+}
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+
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+- (void)invalidateTimer
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+{
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+ [_addMediaTimer invalidate];
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+ _addMediaTimer = nil;
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+}
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+
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+@end
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Gleb Pinigin