DownloadItem.m

/*
     File: DownloadItem.m
 Abstract: DownloadItem stores information of a downloaded item used by MyDocument.
  Version: 1.1
 
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 */
 
#import "DownloadItem.h"
 
#include <QuickLook/QuickLook.h>
 
static NSString *originalURLKey = @"downloadURL";
static NSString *bookmarkKey = @"bookmark";
static NSOperationQueue *downloadIconQueue = nil;
static NSDictionary *quickLookOptions = nil;
 
#define ICON_SIZE 48.0
 
 
@implementation DownloadItem
 
- (id)initWithOriginalURL:(NSURL *)downloadURL fileURL:(NSURL *)onDiskURL
{
    self = [super init];
    if (self != nil) {
        _originalURL = [downloadURL copy];
        _resolvedFileURL = [onDiskURL copy];
    }
    return self;
}
 
- (id)initWithSavedPropertyList:(id)propertyList
{
    self = [super init];
    if (self != nil)
    {
        if (![propertyList isKindOfClass:[NSDictionary class]])
        {
            return nil;
        }
        
        NSString *originalURLString = propertyList[originalURLKey];
        if (!originalURLString || ![originalURLString isKindOfClass:[NSString class]])
        {
            return nil;
        }
        
        _originalURL = [[NSURL alloc] initWithString:originalURLString];
        if (!self.originalURL)
        {
            return nil;
        }
        
        NSData *bookmarkData = propertyList[bookmarkKey];
        if (!bookmarkData || ![bookmarkData isKindOfClass:[NSData class]])
        {
            return nil;
        }
        
        // test if the file still exists
        _resolvedFileURL = [NSURL URLByResolvingBookmarkData:bookmarkData
                                                     options:(NSURLBookmarkResolutionWithoutUI | NSURLBookmarkResolutionWithoutMounting)
                                               relativeToURL:nil bookmarkDataIsStale:NULL error:NULL];
        if (!self.resolvedFileURL)
        {
            return nil;
        }
    }
    
    return self;
}
 
- (NSImage *)iconImage
{
    if (_iconImage == nil)
    {
        _iconImage = [[NSWorkspace sharedWorkspace] iconForFile:[self.resolvedFileURL path]];
        [_iconImage setSize:NSMakeSize(ICON_SIZE, ICON_SIZE)];
        if (!downloadIconQueue)
        {
            downloadIconQueue = [[NSOperationQueue alloc] init];
            [downloadIconQueue setMaxConcurrentOperationCount:2];
            quickLookOptions = @{(id)kQLThumbnailOptionIconModeKey: (id)kCFBooleanTrue};
        }
        [downloadIconQueue addOperationWithBlock:^{
            CGImageRef quickLookIcon = QLThumbnailImageCreate(NULL, (__bridge CFURLRef)self.resolvedFileURL, CGSizeMake(ICON_SIZE, ICON_SIZE), (__bridge CFDictionaryRef)quickLookOptions);
            if (quickLookIcon != NULL)
            {
                NSImage* betterIcon = [[NSImage alloc] initWithCGImage:quickLookIcon size:NSMakeSize(ICON_SIZE, ICON_SIZE)];
                [self performSelectorOnMainThread:@selector(setIconImage:) withObject:betterIcon waitUntilDone:NO];
                CFRelease(quickLookIcon);
            }
        }];
    }
    return _iconImage;
}
 
- (NSString *)displayName
{
    return [[self.resolvedFileURL path] lastPathComponent];
}
 
- (id)propertyListForSaving
{
    NSData *bookmarkData = [self.resolvedFileURL bookmarkDataWithOptions:NSURLBookmarkCreationMinimalBookmark includingResourceValuesForKeys:nil relativeToURL:nil error:NULL];
    if (!bookmarkData)
    {
        return nil;
    }
    return @{originalURLKey: [self.originalURL absoluteString],
            bookmarkKey: bookmarkData};
}
 
- (NSString *)description
{
    return [NSString stringWithFormat:@"<%@ %@ (from %@)>", [self class], self.resolvedFileURL, self.originalURL];
}
 
@end