/*

File: ImageDocController.m

Abstract: ImageDocController class implementation

Version: <1.0>

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*/

#import "ImageDocController.h"

/* 

    Typically, an application that uses NSDocumentController can only

    support a static list of file formats enumerated in its Info.plist file.

    This subclass of NSDocumentController is provided so that this

    application can dynamically support all the file formats supported 

    by ImageIO.

 */

static NSString* ImageIOLocalizedString (NSString* key)

{

    static NSBundle* b = nil;

    if (b==nil)

        b = [NSBundle bundleWithIdentifier:@"com.apple.ImageIO.framework"];

    // Returns a localized version of the string designated by 'key' in table 'CGImageSource'. 

    return [b localizedStringForKey:key value:key table: @"CGImageSource"];

}

@implementation ImageDocController

- (NSString*) defaultType

{

    return @"public.tiff";

}

// Return the names of NSDocument subclasses supported by this application.

// In this app, the only class is "ImageDoc".

//

- (NSArray*) documentClassNames

{

    return [NSArray arrayWithObject:@"ImageDoc"];

}

// Given a document type name, return the subclass of NSDocument

// that should be instantiated when opening a document of that type.

// In this app, the only class is "ImageDoc".

//

- (Class)documentClassForType:(NSString *)typeName

{

    return [[NSBundle mainBundle] classNamed:@"ImageDoc"];

}

// Given a document type name, return a string describing the document 

// type that is fit to present to the user.

//

- (NSString*) displayNameForType:(NSString *)typeName;

{

    return ImageIOLocalizedString(typeName);

}

// Return the name of the document type that should be used when opening a URL

// In this app, we return the UTI type returned by CGImageSourceGetType.

//

- (NSString*) typeForContentsOfURL:(NSURL *)absURL error:(NSError **)outError

{

    NSString* type = nil;

    CGImageSourceRef isrc = CGImageSourceCreateWithURL((__bridge CFURLRef)absURL, nil);

    if (isrc)

    {

        type = (__bridge NSString*)CGImageSourceGetType(isrc);

        CFRelease(isrc);

    }

    return type;

}

// Given a document type, return an array of corresponding file name extensions 

// and HFS file type strings of the sort returned by NSFileTypeForHFSTypeCode().

// In this app, 'typeName' is a UTI type so we can call UTTypeCopyDeclaration().

//

- (NSArray*) fileExtensionsFromType:(NSString *)typeName;

{

    NSArray* readExts = nil;

    CFDictionaryRef utiDecl = UTTypeCopyDeclaration((__bridge CFStringRef)typeName);

    if (utiDecl)

    {

        CFDictionaryRef utiSpec = CFDictionaryGetValue(utiDecl, kUTTypeTagSpecificationKey);

        if (utiSpec)

        {

            CFTypeRef  ext = CFDictionaryGetValue(utiSpec, kUTTagClassFilenameExtension);

            if (ext && CFGetTypeID(ext) == CFStringGetTypeID())

                readExts = [NSArray arrayWithObject:(__bridge id)ext];

            if (ext && CFGetTypeID(ext) == CFArrayGetTypeID())

                readExts = [NSArray arrayWithArray:(__bridge id)ext];

        }

        CFRelease(utiDecl);

    }

    return readExts;

}

@end