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Break out reused functions for object mapping introspection into RKObjectUtilities

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Blake Watters
2012-09-30 12:49:59 -04:00
parent 03439f2464
commit d95fe5cd44
8 changed files with 179 additions and 72 deletions
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75
Code/ObjectMapping/RKMappingOperation.m
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@@ -18,7 +18,6 @@
// limitations under the License.
//
#import <objc/message.h>
#import "RKMappingOperation.h"
#import "RKMappingErrors.h"
#import "RKPropertyInspector.h"
@@ -29,41 +28,12 @@
#import "RKMappingOperationDataSource.h"
#import "RKObjectMappingOperationDataSource.h"
#import "RKDynamicMapping.h"
#import "RKObjectUtilities.h"
// Set Logging Component
#undef RKLogComponent
#define RKLogComponent RKlcl_cRestKitObjectMapping
// Temporary home for object equivalancy tests
BOOL RKValueIsEqualToValue(id sourceValue, id destinationValue);
BOOL RKValueIsEqualToValue(id sourceValue, id destinationValue) {
NSCAssert(sourceValue, @"Expected sourceValue not to be nil");
NSCAssert(destinationValue, @"Expected destinationValue not to be nil");
SEL comparisonSelector;
if ([sourceValue isKindOfClass:[NSString class]] && [destinationValue isKindOfClass:[NSString class]]) {
comparisonSelector = @selector(isEqualToString:);
} else if ([sourceValue isKindOfClass:[NSNumber class]] && [destinationValue isKindOfClass:[NSNumber class]]) {
comparisonSelector = @selector(isEqualToNumber:);
} else if ([sourceValue isKindOfClass:[NSDate class]] && [destinationValue isKindOfClass:[NSDate class]]) {
comparisonSelector = @selector(isEqualToDate:);
} else if ([sourceValue isKindOfClass:[NSArray class]] && [destinationValue isKindOfClass:[NSArray class]]) {
comparisonSelector = @selector(isEqualToArray:);
} else if ([sourceValue isKindOfClass:[NSDictionary class]] && [destinationValue isKindOfClass:[NSDictionary class]]) {
comparisonSelector = @selector(isEqualToDictionary:);
} else if ([sourceValue isKindOfClass:[NSSet class]] && [destinationValue isKindOfClass:[NSSet class]]) {
comparisonSelector = @selector(isEqualToSet:);
} else {
comparisonSelector = @selector(isEqual:);
}
// Comparison magic using function pointers. See this page for details: http://www.red-sweater.com/blog/320/abusing-objective-c-with-class
// Original code courtesy of Greg Parker
// This is necessary because isEqualToNumber will return negative integer values that aren't coercable directly to BOOL's without help [sbw]
BOOL (*ComparisonSender)(id, SEL, id) = (BOOL (*)(id, SEL, id))objc_msgSend;
return ComparisonSender(sourceValue, comparisonSelector, destinationValue);
}
extern NSString * const RKObjectMappingNestingAttributeKeyName;
@interface RKMappingOperation ()
@@ -192,7 +162,7 @@ NSDate *RKDateFromStringWithFormatters(NSString *dateString, NSArray *formatters
- (BOOL)isValue:(id)sourceValue equalToValue:(id)destinationValue
{
return RKValueIsEqualToValue(sourceValue, destinationValue);
return RKObjectIsEqualToObject(sourceValue, destinationValue);
}
- (BOOL)validateValue:(id *)value atKeyPath:(NSString *)keyPath
@@ -380,19 +350,6 @@ NSDate *RKDateFromStringWithFormatters(NSString *dateString, NSArray *formatters
return appliedMappings;
}
- (BOOL)isTypeACollection:(Class)type
{
Class orderedSetClass = NSClassFromString(@"NSOrderedSet");
return (type && ([type isSubclassOfClass:[NSSet class]] ||
[type isSubclassOfClass:[NSArray class]] ||
(orderedSetClass && [type isSubclassOfClass:orderedSetClass])));
}
- (BOOL)isValueACollection:(id)value
{
return [self isTypeACollection:[value class]];
}
- (BOOL)mapNestedObject:(id)anObject toObject:(id)anotherObject withRelationshipMapping:(RKRelationshipMapping *)relationshipMapping
{
NSAssert(anObject, @"Cannot map nested object without a nested source object");
@@ -464,23 +421,23 @@ NSDate *RKDateFromStringWithFormatters(NSString *dateString, NSArray *formatters
}
// Handle case where incoming content is a single object, but we want a collection
Class relationshipType = [self.objectMapping classForKeyPath:relationshipMapping.destinationKeyPath];
BOOL mappingToCollection = [self isTypeACollection:relationshipType];
if (mappingToCollection && ![self isValueACollection:value]) {
Class relationshipClass = [self.objectMapping classForKeyPath:relationshipMapping.destinationKeyPath];
BOOL mappingToCollection = RKClassIsCollection(relationshipClass);
if (mappingToCollection && !RKObjectIsCollection(value)) {
Class orderedSetClass = NSClassFromString(@"NSOrderedSet");
RKLogDebug(@"Asked to map a single object into a collection relationship. Transforming to an instance of: %@", NSStringFromClass(relationshipType));
if ([relationshipType isSubclassOfClass:[NSArray class]]) {
value = [relationshipType arrayWithObject:value];
} else if ([relationshipType isSubclassOfClass:[NSSet class]]) {
value = [relationshipType setWithObject:value];
} else if (orderedSetClass && [relationshipType isSubclassOfClass:orderedSetClass]) {
value = [relationshipType orderedSetWithObject:value];
RKLogDebug(@"Asked to map a single object into a collection relationship. Transforming to an instance of: %@", NSStringFromClass(relationshipClass));
if ([relationshipClass isSubclassOfClass:[NSArray class]]) {
value = [relationshipClass arrayWithObject:value];
} else if ([relationshipClass isSubclassOfClass:[NSSet class]]) {
value = [relationshipClass setWithObject:value];
} else if (orderedSetClass && [relationshipClass isSubclassOfClass:orderedSetClass]) {
value = [relationshipClass orderedSetWithObject:value];
} else {
RKLogWarning(@"Failed to transform single object");
}
}
if ([self isValueACollection:value]) {
if (RKObjectIsCollection(value)) {
// One to many relationship
RKLogDebug(@"Mapping one to many relationship value at keyPath '%@' to '%@'", relationshipMapping.sourceKeyPath, relationshipMapping.destinationKeyPath);
appliedMappings = YES;
@@ -489,7 +446,7 @@ NSDate *RKDateFromStringWithFormatters(NSString *dateString, NSArray *formatters
id collectionSanityCheckObject = nil;
if ([value respondsToSelector:@selector(anyObject)]) collectionSanityCheckObject = [value anyObject];
if ([value respondsToSelector:@selector(lastObject)]) collectionSanityCheckObject = [value lastObject];
if ([self isValueACollection:collectionSanityCheckObject]) {
if (RKObjectIsCollection(collectionSanityCheckObject)) {
RKLogWarning(@"WARNING: Detected a relationship mapping for a collection containing another collection. This is probably not what you want. Consider using a KVC collection operator (such as @unionOfArrays) to flatten your mappable collection.");
RKLogWarning(@"Key path '%@' yielded collection containing another collection rather than a collection of objects: %@", relationshipMapping.sourceKeyPath, value);
}
@@ -611,7 +568,7 @@ NSDate *RKDateFromStringWithFormatters(NSString *dateString, NSArray *formatters
{
RKLogDebug(@"Starting mapping operation...");
RKLogTrace(@"Performing mapping operation: %@", self);
// Determine the concrete mapping if we were initialized with a dynamic mapping
if ([self.mapping isKindOfClass:[RKDynamicMapping class]]) {
self.objectMapping = [(RKDynamicMapping *)self.mapping objectMappingForRepresentation:self.sourceObject];
@@ -623,7 +580,7 @@ NSDate *RKDateFromStringWithFormatters(NSString *dateString, NSArray *formatters
} else if ([self.mapping isKindOfClass:[RKObjectMapping class]]) {
self.objectMapping = (RKObjectMapping *)self.mapping;
}
NSAssert(self.objectMapping, @"Cannot perform a mapping operation with an object mapping");
NSAssert(self.objectMapping, @"Cannot perform a mapping operation without an object mapping");
[self applyNestedMappings];
BOOL mappedAttributes = [self applyAttributeMappings];