Add initial implementation for NSFilePromiseProvider

Headers/AppKit/NSFilePromiseProvider.h

@@ -28,15 +28,49 @@
 #import <Foundation/NSObject.h>
 #import <AppKit/AppKitDefines.h>
 
-#if OS_API_VERSION(MAC_OS_X_VERSION_10_0, GS_API_LATEST)
+#if OS_API_VERSION(MAC_OS_X_VERSION_10_12, GS_API_LATEST)
 
 #if	defined(__cplusplus)
 extern "C" {
 #endif
 
-APPKIT_EXPORT_CLASS    
-@interface NSFilePromiseProvider : NSObject
+@class NSError;
+@class NSFilePromiseProvider;  
+@class NSOperationQueue;
+@class NSString;
+@class NSURL;
 
+DEFINE_BLOCK_TYPE_NO_ARGS(GSFilePromiseProviderCompletionHandler, NSError*);
+
+@protocol NSFilePromiseProviderDelegate
+- (NSString *) filePromiseProvider: (NSFilePromiseProvider *)filePromiseProvider filenameForType: (NSString *)fileType;
+
+- (void)filePromiseProvider:(NSFilePromiseProvider *)filePromiseProvider 
+          writePromiseToURL:(NSURL *)url 
+          completionHandler:(GSFilePromiseProviderCompletionHandler)completionHandler;
+
+- (NSOperationQueue *)operationQueueForFilePromiseProvider:(NSFilePromiseProvider *)filePromiseProvider;
+@end
+  
+APPKIT_EXPORT_CLASS
+@interface NSFilePromiseProvider : NSObject
+{
+  NSString *_fileType;
+  id<NSFilePromiseProviderDelegate> _delegate;
+  id _userInfo;
+}
+
+- (instancetype) initWithFileType: (NSString *)fileType delegate: (id<NSFilePromiseProviderDelegate>)delegate;
+
+- (id<NSFilePromiseProviderDelegate>) delegate;
+- (void) setDelegate: (id<NSFilePromiseProviderDelegate>) delegate;
+
+- (NSString *) fileType;
+- (void) setFileType: (NSString *)fileType;
+
+- (id) userInfo;
+- (void) setUserInfo: (id)userInfo;
+  
 @end
 
 #if	defined(__cplusplus)

Source/NSFilePromiseProvider.m

@@ -22,9 +22,55 @@
    Boston, MA 02110 USA.
 */
 
+#import <Foundation/NSError.h>
+#import <Foundation/NSString.h>
+
 #import "AppKit/NSFilePromiseProvider.h"
 
 @implementation NSFilePromiseProvider
 
+- (instancetype) initWithFileType: (NSString *)fileType delegate: (id<NSFilePromiseProviderDelegate>)delegate
+{
+  self = [super init];
+
+  if (self != nil)
+    {
+      ASSIGN(_fileType, fileType);
+      _delegate = delegate;
+    }
+  
+  return self;
+}
+
+- (id<NSFilePromiseProviderDelegate>) delegate
+{
+  return _delegate;
+}
+
+- (void) setDelegate: (id<NSFilePromiseProviderDelegate>) delegate
+{
+  _delegate = delegate; // retained by caller...
+}
+
+- (NSString *) fileType
+{
+  return _fileType;
+}
+
+- (void) setFileType: (NSString *)fileType
+{
+  ASSIGN(_fileType, fileType);
+}
+
+- (id) userInfo
+{
+  return _userInfo;
+}
+
+- (void) setUserInfo: (id)userInfo
+{
+  ASSIGN(_userInfo, userInfo);
+}
+
 @end