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Switching to NSInvocation approach to dynamic JSON library-agnostic encoding and decoding, appropriating @steipete's work on HockeyApp

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This commit is contained in:
Mattt Thompson 2011-11-08 11:12:44 -06:00
parent 9a91afe3e2
commit 206f6ff1f6
3 changed files with 113 additions and 63 deletions
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170
AFNetworking/AFJSONUtilities.h
View file

@ -24,69 +24,123 @@
#include <Availability.h>
#if defined(_AF_USE_JSONKIT)
#import "JSONKit.h"
#elif defined(_AF_USE_SBJSON)
#import "SBJSON.h"
static SBJsonParser * _SBJSONParser() {
static SBJsonParser *_af_SBJSONParser = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
_af_SBJSONParser = [[SBJsonParser alloc] init];
});
return _af_SBJSONParser;
}
static SBJsonWriter * _SBJSONWriter() {
static SBJsonWriter *_af_SBJSONWriter = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
_af_SBJSONWriter = [[SBJsonWriter alloc] init];
});
return _af_SBJSONWriter;
}
#elif defined(_AF_USE_YAJL)
#if __IPHONE_OS_VERSION_MIN_REQUIRED
#import <YAJL/YAJL.h>
#elif __MAC_OS_X_VERSION_MIN_REQUIRED
#import <YAJLiOS/YAJL.h>
#endif
#endif
static inline NSData * AFJSONEncode(id object, NSError **error) {
#if defined(_AF_USE_JSONKIT)
return [object JSONData];
#elif defined(_AF_USE_SBJSON)
SBJsonWriter *writer = _SBJSONWriter();
return [writer dataWithObject:object];
#elif defined(_AF_USE_YAJL)
return [[object yajl_JSONString] dataUsingEncoding:NSUTF8StringEncoding]];
#else
if ([NSJSONSerialization class]) {
return [NSJSONSerialization dataWithJSONObject:object options:0 error:error];
}
#endif
NSData *data = nil;
return nil;
id _NSJSONSerializationClass = NSClassFromString(@"NSJSONSerialization");
SEL _NSJSONSerializationSelector = NSSelectorFromString(@"dataWithJSONObject:options:error:");
SEL _JSONKitSelector = NSSelectorFromString(@"JSONDataWithOptions:error:");
SEL _SBJSONSelector = NSSelectorFromString(@"JSONRepresentation");
SEL _YAJLSelector = NSSelectorFromString(@"yajl_JSONString");
if (_NSJSONSerializationClass && [_NSJSONSerializationClass respondsToSelector:_NSJSONSerializationSelector]) {
NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[_NSJSONSerializationClass methodSignatureForSelector:_NSJSONSerializationSelector]];
invocation.target = _NSJSONSerializationClass;
invocation.selector = _NSJSONSerializationSelector;
[invocation setArgument:&object atIndex:2]; // arguments 0 and 1 are self and _cmd respectively, automatically set by NSInvocation
NSUInteger writeOptions = 0;
[invocation setArgument:&writeOptions atIndex:3];
[invocation setArgument:error atIndex:4];
[invocation invoke];
[invocation getReturnValue:&data];
} else if (_JSONKitSelector && [data respondsToSelector:_JSONKitSelector]) {
NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[data methodSignatureForSelector:_JSONKitSelector]];
invocation.target = data;
invocation.selector = _JSONKitSelector;
NSUInteger serializeOptionFlags = 0;
[invocation setArgument:&serializeOptionFlags atIndex:2]; // arguments 0 and 1 are self and _cmd respectively, automatically set by NSInvocation
[invocation setArgument:error atIndex:3];
[invocation invoke];
[invocation getReturnValue:&data];
} else if (_SBJSONSelector && [data respondsToSelector:_SBJSONSelector]) {
NSString *JSONString = nil;
NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[data methodSignatureForSelector:_SBJSONSelector]];
invocation.target = data;
invocation.selector = _SBJSONSelector;
[invocation invoke];
[invocation getReturnValue:&data];
data = [JSONString dataUsingEncoding:NSUTF8StringEncoding];
} else if (_YAJLSelector && [data respondsToSelector:_YAJLSelector]) {
@try {
NSString *JSONString = nil;
NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[data methodSignatureForSelector:_YAJLSelector]];
invocation.target = data;
invocation.selector = _YAJLSelector;
[invocation invoke];
[invocation getReturnValue:&JSONString];
data = [JSONString dataUsingEncoding:NSUTF8StringEncoding];
}
@catch (NSException *exception) {
*error = [[[NSError alloc] initWithDomain:NSStringFromClass([exception class]) code:0 userInfo:[exception userInfo]] autorelease];
}
}
return data;
}
static inline id AFJSONDecode(NSData *data, NSError **error) {
id JSON = nil;
#if defined(_AF_USE_JSONKIT)
return [[JSONDecoder decoder] objectWithData:data error:error];
#elif defined(_AF_USE_SBJSON)
SBJsonParser *parser = _SBJsonParser();
return [parser objectWithData:data];
#elif defined(_AF_USE_YAJL)
return [data yajl_JSON];
#else
if ([NSJSONSerialization class]) {
return [NSJSONSerialization JSONObjectWithData:data options:0 error:error];
}
#endif
id _NSJSONSerializationClass = NSClassFromString(@"NSJSONSerialization");
SEL _NSJSONSerializationSelector = NSSelectorFromString(@"JSONObjectWithData:options:error:");
SEL _JSONKitSelector = NSSelectorFromString(@"objectFromJSONDataWithParseOptions:error:");
SEL _SBJSONSelector = NSSelectorFromString(@"JSONValue");
SEL _YAJLSelector = NSSelectorFromString(@"yajl_JSONWithOptions:error:");
return nil;
if (_NSJSONSerializationClass && [_NSJSONSerializationClass respondsToSelector:_NSJSONSerializationSelector]) {
NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[_NSJSONSerializationClass methodSignatureForSelector:_NSJSONSerializationSelector]];
invocation.target = _NSJSONSerializationClass;
invocation.selector = _NSJSONSerializationSelector;
[invocation setArgument:&data atIndex:2]; // arguments 0 and 1 are self and _cmd respectively, automatically set by NSInvocation
NSUInteger readOptions = 0;
[invocation setArgument:&readOptions atIndex:3];
[invocation setArgument:error atIndex:4];
[invocation invoke];
[invocation getReturnValue:&JSON];
} else if (_JSONKitSelector && [data respondsToSelector:_JSONKitSelector]) {
NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[data methodSignatureForSelector:_JSONKitSelector]];
invocation.target = data;
invocation.selector = _JSONKitSelector;
NSUInteger parseOptionFlags = 0;
[invocation setArgument:&parseOptionFlags atIndex:2]; // arguments 0 and 1 are self and _cmd respectively, automatically set by NSInvocation
[invocation setArgument:error atIndex:3];
[invocation invoke];
[invocation getReturnValue:&JSON];
} else if (_SBJSONSelector && [data respondsToSelector:_SBJSONSelector]) {
NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[data methodSignatureForSelector:_SBJSONSelector]];
invocation.target = data;
invocation.selector = _SBJSONSelector;
[invocation invoke];
[invocation getReturnValue:&JSON];
} else if (_YAJLSelector && [data respondsToSelector:_YAJLSelector]) {
NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[data methodSignatureForSelector:_YAJLSelector]];
invocation.target = data;
invocation.selector = _YAJLSelector;
NSUInteger yajlParserOptions = 0;
[invocation setArgument:&yajlParserOptions atIndex:2]; // arguments 0 and 1 are self and _cmd respectively, automatically set by NSInvocation
[invocation setArgument:error atIndex:3];
[invocation invoke];
[invocation getReturnValue:&JSON];
}
return JSON;
}

2
Mac Example/Classes/AFGowallaAPIClient.h
View file

@ -23,8 +23,6 @@
#import <Foundation/Foundation.h>
#import "AFHTTPClient.h"
#define _AF_USE_JSONKIT
extern NSString * const kAFGowallaClientID;
extern NSString * const kAFGowallaBaseURLString;

2
iOS Example/Classes/AFGowallaAPIClient.h
View file

@ -23,8 +23,6 @@
#import <Foundation/Foundation.h>
#import "AFHTTPClient.h"
#define _AF_USE_JSONKIT
extern NSString * const kAFGowallaClientID;
extern NSString * const kAFGowallaBaseURLString;