NSObject+classSwitch.h

//
//  NSObject+classSwitch.h
//
//  Created by Jonathan Annett on 30/10/13.
//  Copyright (c) 2013 Sophtwhere. All rights reserved.
//
/*


 example 1: // simple c style switch/case based on instantiated class type.


        switch (testme.classSwitchCode) {
            case isNSString:
                NSLog(@"%@ is a string!",testme);
                break;
            case isNSArray:
                NSLog(@"%@ is an array with %d elements!",testme,[(NSArray*) testme count]);

                break;
            case isNSDictionary:

                NSLog(@"%@ is an dictionary with these keys: %@!",testme,[(NSDictionary*) testme allKeys]);

                break;

            default:
                break;
        }


 example 2: define blocks in a dictionary and dispatch the appropriate one

    NSDictionary *checkerBlocks = @{

                                    _isUndefinedObject_ : ^{

                                        NSLog(@"don't know what to do with this");

                                    },

                                    // use same handler for NSDictionary and NSMutableDictionary
                                   _isNSMutableDictionary_ : _isNSDictionary_,
                                   _isNSDictionary_ :
                                       ^{
                                           NSLog(@"this is a block for a dictionary");
                                       },

                                    // treat NSURL as undefined.
                                    _isNSURL_ : _isUndefinedObject_,

                                   _isNSArray_ :
                                       ^{
                                           NSLog(@"this is a block for an array");
                                       },

                                   _isNSString_ :
                                       ^{
                                           NSLog(@"this is a block for a string - success");
                                       }

                                   };


                                            }];

     [object1 class_specific_block_dispatch_async:dispatch_get_main_queue() blocks:checkerBlocks];
     [object2 class_specific_block_dispatch_async:dispatch_get_main_queue() blocks:checkerBlocks];
     [object3 class_specific_block_dispatch_async:dispatch_get_main_queue() blocks:checkerBlocks];


*/

#import <Foundation/Foundation.h>
#import <AVFoundation/AVFoundation.h>
#import <AssetsLibrary/AssetsLibrary.h>
#import <MediaPlayer/MediaPlayer.h>



#define DEFINE_OBECTS()\
DEF_OBJ_CODE(NSString)\
DEF_OBJ_CODE(NSArray)\
DEF_OBJ_CODE(NSMutableArray)\
DEF_OBJ_CODE(NSDictionary)\
DEF_OBJ_CODE(NSMutableDictionary)\
DEF_OBJ_CODE(AVURLAsset)\
DEF_OBJ_CODE(ALAsset)\
DEF_OBJ_CODE(NSURL)\
DEF_OBJ_CODE(UIImage)\
DEF_OBJ_CODE(MPMediaItem)\
DEF_OBJ_CODE(NSURLConnection)\





/////////////////////////////////
#define DEF_OBJ_CODE(NSObject)\
extern NSString *_is##NSObject##_;
DEFINE_OBECTS()
#undef DEF_OBJ_CODE
/////////////////////////////////
extern NSString *_isUndefinedObject_;









/////////////////////////////////
#define DEF_OBJ_CODE(NSObject)\
  is##NSObject,

enum nsObjectSwitchCode {
    isUndefinedObject=0,
    DEFINE_OBECTS()
};

#undef DEF_OBJ_CODE
/////////////////////////////////


/////////////////////////////////
#define DEF_OBJ_CODE(NSObject)\
@interface NSObject (classSwitch)\
-(enum nsObjectSwitchCode) classSwitchCode;\
+(enum nsObjectSwitchCode) classSwitchCode;\
-(NSObject*) as##NSObject;\
-(BOOL) is##NSObject;\
@end

DEFINE_OBECTS()

#undef DEF_OBJ_CODE
/////////////////////////////////











/////////////////////////////////
#define DEF_OBJ_CODE(NSObject)\
-(BOOL) is##NSObject;\
-(NSObject*) as##NSObject;

@interface NSObject(classSwitchDefaults)
-(dispatch_block_t) class_specific_block_copy:(NSDictionary*) blocks;
-(void) class_specific_block_dispatch:(NSDictionary*) blocks;
-(void) class_specific_block_dispatch_async:(dispatch_queue_t) queue
                                     blocks:(NSDictionary*) blocks;
-(enum nsObjectSwitchCode) classSwitchCode ;
-(BOOL)isUndefinedObject ;

DEFINE_OBECTS()

@end
#undef DEF_OBJ_CODE
/////////////////////////////////