/*

File: PlaylistItem.m

Abstract: Implementation of the PlaylistItem object.

          A PlaylistItem object represents a single movie in a list

          of movies that are to be played. A PlaylistItem object 

          conforms to the NSCoding protocol to allow a playlist to be written

          to a file on disk. It also conforms to the NSPasteboardWriting

          and NSPasteboardReading protocols to enable copy and paste 

          operations between different playlists.

Version: 1.0

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*/

#import "PlaylistItem.h"

/* 

Using a private pasteboard type that conforms to UTI naming guidelines.  

Since this type is only used by this application, it is not formally declared as a UTI.

*/

NSString * const MyPasteboardTypePlaylistItem = @"com.example.pasteboard.playlistItem";

static NSString * const PlaylistItemURLCoderKey = @"URL";

@implementation PlaylistItem

+ (void)initialize

{

    if (self == [PlaylistItem class])

    {

        [self setVersion:1];

    }

}

+ (PlaylistItem *)playlistItemWithURL:(NSURL *)URL

{

    return [[[self alloc] initWithURL:URL] autorelease];

}

- (id)initWithURL:(NSURL *)URL

{

    self = [super init];

    if (self)

    {

        mURL = [URL copy];

    }

    return self;

}

- (id)init 

{    

    return [self initWithURL:nil];

}

@synthesize URL = mURL;

@dynamic localizedName;

- (NSString *)localizedName 

{

    NSString *displayName = nil;

    NSURL *URL = [self URL];

    [URL getResourceValue:&displayName forKey:NSURLLocalizedNameKey error:NULL];

    if (!displayName)

        displayName = [URL lastPathComponent];

    return displayName;

}

#pragma mark NSCoding

/*

The NSCoding protocol declares the -encodeWithCoder: and -initWithCoder: methods 

that a class must implement so that instances of that class can be encoded and decoded.

*/

- (void)encodeWithCoder:(NSCoder *)coder 

{

    [coder encodeObject:[self URL] forKey:PlaylistItemURLCoderKey];

}

- (id)initWithCoder:(NSCoder *)coder 

{

    return [self initWithURL:[coder decodeObjectForKey:PlaylistItemURLCoderKey]];

}

- (void)dealloc

{

    [mURL release];

    [super dealloc];

}

/* 

Implementing NSPasteboardWriting and NSPasteboardReading protocols to allow 

PlaylistItems to be written and read on the pasteboard 

*/

#pragma mark NSPasteboardWriting

/* NSPasteboardWriting */

- (NSArray *)writableTypesForPasteboard:(NSPasteboard *)pasteboard 

{

    return [NSArray arrayWithObjects:MyPasteboardTypePlaylistItem, NSPasteboardTypeString, nil];

}

- (id)pasteboardPropertyListForType:(NSString *)type 

{

    if ([type isEqualToString:MyPasteboardTypePlaylistItem]) 

    {

        return [NSKeyedArchiver archivedDataWithRootObject:self];

    } 

    else if ([type isEqualToString:NSPasteboardTypeString]) 

    {

        return [self localizedName];

    } 

    else 

    {

        return nil; // Return nil if we are asked for a type we don't support

    }

}

#pragma mark NSPasteboardReading

/* NSPasteboardReading */

+ (NSArray *)readableTypesForPasteboard:(NSPasteboard *)pasteboard 

{

    return [NSArray arrayWithObject:MyPasteboardTypePlaylistItem];

}

+ (NSPasteboardReadingOptions)readingOptionsForType:(NSString *)type pasteboard:(NSPasteboard *)pasteboard 

{

    if ([type isEqualToString:MyPasteboardTypePlaylistItem]) 

    {

        return NSPasteboardReadingAsKeyedArchive;

    } 

    else 

    {

        return 0;

    }

}

@end