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GTLObject.m
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GTLObject.m
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/* Copyright (c) 2011 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
//
// GTLObject.m
//
#define GTLOBJECT_DEFINE_GLOBALS 1
#include <objc/runtime.h>
#import "GTLObject.h"
#import "GTLRuntimeCommon.h"
#import "GTLJSONParser.h"
static NSString *const kUserDataPropertyKey = @"_userData";
@interface GTLObject () <GTLRuntimeCommon>
+ (NSMutableArray *)allDeclaredProperties;
+ (NSArray *)allKnownKeys;
+ (NSArray *)fieldsElementsForJSON:(NSDictionary *)targetJSON;
+ (NSString *)fieldsDescriptionForJSON:(NSDictionary *)targetJSON;
+ (NSMutableDictionary *)patchDictionaryForJSON:(NSDictionary *)newJSON
fromOriginalJSON:(NSDictionary *)originalJSON;
@end
@implementation GTLObject
@synthesize JSON = json_,
surrogates = surrogates_,
userProperties = userProperties_;
+ (id)object {
return [[[self alloc] init] autorelease];
}
+ (id)objectWithJSON:(NSMutableDictionary *)dict {
GTLObject *obj = [self object];
obj.JSON = dict;
return obj;
}
+ (NSDictionary *)propertyToJSONKeyMap {
return nil;
}
+ (NSDictionary *)arrayPropertyToClassMap {
return nil;
}
+ (Class)classForAdditionalProperties {
return Nil;
}
- (BOOL)isEqual:(GTLObject *)other {
if (self == other) return YES;
if (other == nil) return NO;
// The objects should be the same class, or one should be a subclass of the
// other's class
if (![other isKindOfClass:[self class]]
&& ![self isKindOfClass:[other class]]) return NO;
// What we're not comparing here:
// properties
return GTL_AreEqualOrBothNil(json_, [other JSON]);
}
// By definition, for two objects to potentially be considered equal,
// they must have the same hash value. The hash is mostly ignored,
// but removeObjectsInArray: in Leopard does seem to check the hash,
// and NSObject's default hash method just returns the instance pointer.
// We'll define hash here for all of our GTLObjects.
- (NSUInteger)hash {
return (NSUInteger) (void *) [GTLObject class];
}
- (id)copyWithZone:(NSZone *)zone {
GTLObject* newObject = [[[self class] allocWithZone:zone] init];
CFPropertyListRef ref = CFPropertyListCreateDeepCopy(kCFAllocatorDefault,
json_, kCFPropertyListMutableContainers);
GTL_DEBUG_ASSERT(ref != NULL, @"GTLObject: copy failed (probably a non-plist type in the JSON)");
newObject.JSON = [NSMakeCollectable(ref) autorelease];
newObject.surrogates = self.surrogates;
// What we're not copying:
// userProperties
return newObject;
}
- (NSString *)descriptionWithLocale:(id)locale {
return [self description];
}
- (void)dealloc {
[json_ release];
[surrogates_ release];
[childCache_ release];
[userProperties_ release];
[super dealloc];
}
#pragma mark JSON values
- (void)setJSONValue:(id)obj forKey:(NSString *)key {
NSMutableDictionary *dict = self.JSON;
if (dict == nil && obj != nil) {
dict = [NSMutableDictionary dictionaryWithCapacity:1];
self.JSON = dict;
}
[dict setValue:obj forKey:key];
}
- (id)JSONValueForKey:(NSString *)key {
id obj = [self.JSON objectForKey:key];
return obj;
}
- (NSString *)JSONString {
NSError *error = nil;
NSString *str = [GTLJSONParser stringWithObject:[self JSON]
humanReadable:YES
error:&error];
if (error) {
return [error description];
}
return str;
}
- (NSArray *)additionalJSONKeys {
NSArray *knownKeys = [[self class] allKnownKeys];
NSMutableArray *result = [NSMutableArray arrayWithArray:[json_ allKeys]];
[result removeObjectsInArray:knownKeys];
// Return nil instead of an empty array.
if ([result count] == 0) {
result = nil;
}
return result;
}
#pragma mark Partial - Fields
- (NSString *)fieldsDescription {
NSString *str = [GTLObject fieldsDescriptionForJSON:self.JSON];
return str;
}
+ (NSString *)fieldsDescriptionForJSON:(NSDictionary *)targetJSON {
// Internal routine: recursively generate a string field description
// by joining elements
NSArray *array = [self fieldsElementsForJSON:targetJSON];
NSString *str = [array componentsJoinedByString:@","];
return str;
}
+ (NSArray *)fieldsElementsForJSON:(NSDictionary *)targetJSON {
// Internal routine: recursively generate an array of field description
// element strings
NSMutableArray *resultFields = [NSMutableArray array];
// Sorting the dictionary keys gives us deterministic results when iterating
NSArray *sortedKeys = [[targetJSON allKeys] sortedArrayUsingSelector:@selector(caseInsensitiveCompare:)];
for (NSString *key in sortedKeys) {
// We'll build a comma-separated list of fields
id value = [targetJSON objectForKey:key];
if ([value isKindOfClass:[NSString class]]
|| [value isKindOfClass:[NSNumber class]]) {
// Basic type (string, number), so the key is what we want
[resultFields addObject:key];
} else if ([value isKindOfClass:[NSDictionary class]]) {
// Object (dictionary): "parent/child1,parent/child2,parent/child3"
NSArray *subElements = [self fieldsElementsForJSON:value];
for (NSString *subElem in subElements) {
NSString *prepended = [NSString stringWithFormat:@"%@/%@",
key, subElem];
[resultFields addObject:prepended];
}
} else if ([value isKindOfClass:[NSArray class]]) {
// Array; we'll generate from the first array entry:
// "parent(child1,child2,child3)"
//
// Open question: should this instead create the union of elements for
// all items in the array, rather than just get fields from the first
// array object?
if ([(NSArray *)value count] > 0) {
id firstObj = [value objectAtIndex:0];
if ([firstObj isKindOfClass:[NSDictionary class]]) {
// An array of objects
NSString *contentsStr = [self fieldsDescriptionForJSON:firstObj];
NSString *encapsulated = [NSString stringWithFormat:@"%@(%@)",
key, contentsStr];
[resultFields addObject:encapsulated];
} else {
// An array of some basic type, or of arrays
[resultFields addObject:key];
}
}
} else {
GTL_ASSERT(0, @"GTLObject unknown field element for %@ (%@)",
key, NSStringFromClass([value class]));
}
}
return resultFields;
}
#pragma mark Partial - Patch
- (id)patchObjectFromOriginal:(GTLObject *)original {
id resultObj;
NSMutableDictionary *resultJSON = [GTLObject patchDictionaryForJSON:self.JSON
fromOriginalJSON:original.JSON];
if ([resultJSON count] > 0) {
resultObj = [[self class] objectWithJSON:resultJSON];
} else {
// Client apps should not attempt to patch with an object containing
// empty JSON
resultObj = nil;
}
return resultObj;
}
+ (NSMutableDictionary *)patchDictionaryForJSON:(NSDictionary *)newJSON
fromOriginalJSON:(NSDictionary *)originalJSON {
// Internal recursive routine to create an object suitable for
// our patch semantics
NSMutableDictionary *resultJSON = [NSMutableDictionary dictionary];
// Iterate through keys present in the old object
NSArray *originalKeys = [originalJSON allKeys];
for (NSString *key in originalKeys) {
id originalValue = [originalJSON objectForKey:key];
id newValue = [newJSON valueForKey:key];
if (newValue == nil) {
// There is no new value for this key, so set the value to NSNull
[resultJSON setValue:[NSNull null] forKey:key];
} else if (!GTL_AreEqualOrBothNil(originalValue, newValue)) {
// The values for this key differ
if ([originalValue isKindOfClass:[NSDictionary class]]
&& [newValue isKindOfClass:[NSDictionary class]]) {
// Both are objects; recurse
NSMutableDictionary *subDict = [self patchDictionaryForJSON:newValue
fromOriginalJSON:originalValue];
[resultJSON setValue:subDict forKey:key];
} else {
// They are non-object values; the new replaces the old. Per the
// documentation for patch, this replaces entire arrays.
[resultJSON setValue:newValue forKey:key];
}
} else {
// The values are the same; omit this key-value pair
}
}
// Iterate through keys present only in the new object, and add them to the
// result
NSMutableArray *newKeys = [NSMutableArray arrayWithArray:[newJSON allKeys]];
[newKeys removeObjectsInArray:originalKeys];
for (NSString *key in newKeys) {
id value = [newJSON objectForKey:key];
[resultJSON setValue:value forKey:key];
}
return resultJSON;
}
+ (id)nullValue {
return [NSNull null];
}
#pragma mark Additional Properties
- (id)additionalPropertyForName:(NSString *)name {
// Return the cached object, if any, before creating one.
id result = [self cacheChildForKey:name];
if (result != nil) {
return result;
}
Class defaultClass = [[self class] classForAdditionalProperties];
id jsonObj = [self JSONValueForKey:name];
BOOL shouldCache = NO;
if (jsonObj != nil) {
NSDictionary *surrogates = self.surrogates;
result = [GTLRuntimeCommon objectFromJSON:jsonObj
defaultClass:defaultClass
surrogates:surrogates
isCacheable:&shouldCache];
}
[self setCacheChild:(shouldCache ? result : nil)
forKey:name];
return result;
}
- (void)setAdditionalProperty:(id)obj forName:(NSString *)name {
BOOL shouldCache = NO;
Class defaultClass = [[self class] classForAdditionalProperties];
id json = [GTLRuntimeCommon jsonFromAPIObject:obj
expectedClass:defaultClass
isCacheable:&shouldCache];
[self setJSONValue:json forKey:name];
[self setCacheChild:(shouldCache ? obj : nil)
forKey:name];
}
- (NSDictionary *)additionalProperties {
NSMutableDictionary *result = [NSMutableDictionary dictionary];
NSArray *propertyNames = [self additionalJSONKeys];
for (NSString *name in propertyNames) {
id obj = [self additionalPropertyForName:name];
[result setObject:obj forKey:name];
}
return result;
}
#pragma mark Child Cache methods
// There is no property for childCache_ as there shouldn't be KVC/KVO
// support for it, it's an implementation detail.
- (void)setCacheChild:(id)obj forKey:(NSString *)key {
if (childCache_ == nil && obj != nil) {
childCache_ = [[NSMutableDictionary alloc] initWithObjectsAndKeys:
obj, key, nil];
} else {
[childCache_ setValue:obj forKey:key];
}
}
- (id)cacheChildForKey:(NSString *)key {
id obj = [childCache_ objectForKey:key];
return obj;
}
#pragma mark userData and user properties
- (void)setUserData:(id)userData {
[self setProperty:userData forKey:kUserDataPropertyKey];
}
- (id)userData {
// be sure the returned pointer has the life of the autorelease pool,
// in case self is released immediately
return [[[self propertyForKey:kUserDataPropertyKey] retain] autorelease];
}
- (void)setProperty:(id)obj forKey:(NSString *)key {
if (obj == nil) {
// user passed in nil, so delete the property
[userProperties_ removeObjectForKey:key];
} else {
// be sure the property dictionary exists
if (userProperties_ == nil) {
self.userProperties = [NSMutableDictionary dictionary];
}
[userProperties_ setObject:obj forKey:key];
}
}
- (id)propertyForKey:(NSString *)key {
id obj = [userProperties_ objectForKey:key];
// be sure the returned pointer has the life of the autorelease pool,
// in case self is released immediately
return [[obj retain] autorelease];
}
#pragma mark Support methods
+ (NSMutableArray *)allDeclaredProperties {
NSMutableArray *array = [NSMutableArray array];
// walk from this class up the hierarchy to GTLObject
Class topClass = class_getSuperclass([GTLObject class]);
for (Class currClass = self;
currClass != topClass;
currClass = class_getSuperclass(currClass)) {
// step through this class's properties, and add the property names to the
// array
objc_property_t *properties = class_copyPropertyList(currClass, NULL);
if (properties) {
for (objc_property_t *prop = properties;
*prop != NULL;
++prop) {
const char *propName = property_getName(*prop);
// We only want dynamic properties; their attributes contain ",D".
const char *attr = property_getAttributes(*prop);
const char *dynamicMarker = strstr(attr, ",D");
if (dynamicMarker &&
(dynamicMarker[2] == 0 || dynamicMarker[2] == ',' )) {
[array addObject:[NSString stringWithUTF8String:propName]];
}
}
free(properties);
}
}
return array;
}
+ (NSArray *)allKnownKeys {
NSArray *allProps = [self allDeclaredProperties];
NSMutableArray *knownKeys = [NSMutableArray arrayWithArray:allProps];
NSDictionary *propMap = [GTLObject propertyToJSONKeyMapForClass:[self class]];
NSUInteger idx = 0;
for (NSString *propName in allProps) {
NSString *jsonKey = [propMap objectForKey:propName];
if (jsonKey) {
[knownKeys replaceObjectAtIndex:idx
withObject:jsonKey];
}
++idx;
}
return knownKeys;
}
- (NSString *)description {
// find the list of declared and otherwise known JSON keys for this class
NSArray *knownKeys = [[self class] allKnownKeys];
NSMutableString *descStr = [NSMutableString string];
NSString *spacer = @"";
for (NSString *key in json_) {
NSString *value = nil;
// show question mark for JSON keys not supported by a declared property:
// foo?:"Hi mom."
NSString *qmark = [knownKeys containsObject:key] ? @"" : @"?";
// determine property value to dislay
id rawValue = [json_ valueForKey:key];
if ([rawValue isKindOfClass:[NSDictionary class]]) {
// for dictionaries, show the list of keys:
// {key1,key2,key3}
NSString *subkeyList = [[rawValue allKeys] componentsJoinedByString:@","];
value = [NSString stringWithFormat:@"{%@}", subkeyList];
} else if ([rawValue isKindOfClass:[NSArray class]]) {
// for arrays, show the number of items in the array:
// [3]
value = [NSString stringWithFormat:@"[%lu]", (unsigned long)[(NSArray *)rawValue count]];
} else if ([rawValue isKindOfClass:[NSString class]]) {
// for strings, show the string in quotes:
// "Hi mom."
value = [NSString stringWithFormat:@"\"%@\"", rawValue];
} else {
// for numbers, show just the number
value = [rawValue description];
}
[descStr appendFormat:@"%@%@%@:%@", spacer, key, qmark, value];
spacer = @" ";
}
NSString *str = [NSString stringWithFormat:@"%@ %p: {%@}",
[self class], self, descStr];
return str;
}
#pragma mark Class Registration
static NSMutableDictionary *gKindMap = nil;
+ (Class)registeredObjectClassForKind:(NSString *)kind {
Class resultClass = [gKindMap objectForKey:kind];
return resultClass;
}
+ (void)registerObjectClassForKind:(NSString *)kind {
// there's no autorelease pool in place at +load time, so we'll create our own
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
if (gKindMap == nil) {
gKindMap = [GTLUtilities newStaticDictionary];
}
Class selfClass = [self class];
#if DEBUG
// ensure this is a unique registration
if ([gKindMap objectForKey:kind] != nil ) {
GTL_DEBUG_LOG(@"%@ (%@) registration conflicts with %@",
selfClass, kind, [gKindMap objectForKey:kind]);
}
if ([[gKindMap allKeysForObject:selfClass] count] != 0) {
GTL_DEBUG_LOG(@"%@ (%@) registration conflicts with %@",
selfClass, kind, [gKindMap allKeysForObject:selfClass]);
}
#endif
[gKindMap setValue:selfClass forKey:kind];
// we drain here to keep the clang static analyzer quiet
[pool drain];
}
#pragma mark Object Instantiation
+ (GTLObject *)objectForJSON:(NSMutableDictionary *)json
defaultClass:(Class)defaultClass
surrogates:(NSDictionary *)surrogates
batchClassMap:(NSDictionary *)batchClassMap {
if ([json count] == 0 || [json isEqual:[NSNull null]]) {
// no actual result, such as the response from a delete
return nil;
}
// Determine the class to instantiate, based on the original fetch
// request or by looking up "kind" string from the registration at
// +load time of GTLObject subclasses
//
// We're letting the dynamic kind override the default class so
// feeds of heterogenous entries can use the defaultClass as a
// fallback
Class classToCreate = defaultClass;
NSString *kind = nil;
if ([json isKindOfClass:[NSDictionary class]]) {
kind = [json valueForKey:@"kind"];
if ([kind isKindOfClass:[NSString class]] && [kind length] > 0) {
Class dynamicClass = [GTLObject registeredObjectClassForKind:kind];
if (dynamicClass) {
classToCreate = dynamicClass;
}
}
}
// Warn the developer that no specific class of GTLObject
// was requested with the fetch call, and no class is found
// compiled in to match the "kind" attribute of the JSON
// returned by the server
GTL_ASSERT(classToCreate != nil,
@"Could not find registered GTLObject subclass to "
"match JSON with kind \"%@\"", kind);
if (classToCreate == nil) {
classToCreate = [self class];
}
// See if the top-level class for the JSON is listed in the surrogates;
// if so, instantiate the surrogate class instead
Class baseSurrogate = [surrogates objectForKey:classToCreate];
if (baseSurrogate) {
classToCreate = baseSurrogate;
}
// now instantiate the GTLObject
GTLObject *parsedObject = [classToCreate object];
parsedObject.surrogates = surrogates;
parsedObject.JSON = json;
// it's time to instantiate inner items
if ([parsedObject conformsToProtocol:@protocol(GTLBatchItemCreationProtocol)]) {
id <GTLBatchItemCreationProtocol> batch =
(id <GTLBatchItemCreationProtocol>) parsedObject;
[batch createItemsWithClassMap:batchClassMap];
}
return parsedObject;
}
#pragma mark Runtime Utilities
static NSMutableDictionary *gJSONKeyMapCache = nil;
static NSMutableDictionary *gArrayPropertyToClassMapCache = nil;
+ (void)initialize {
// Note that initialize is guaranteed by the runtime to be called in a
// thread-safe manner
if (gJSONKeyMapCache == nil) {
gJSONKeyMapCache = [GTLUtilities newStaticDictionary];
}
if (gArrayPropertyToClassMapCache == nil) {
gArrayPropertyToClassMapCache = [GTLUtilities newStaticDictionary];
}
}
+ (NSDictionary *)propertyToJSONKeyMapForClass:(Class<GTLRuntimeCommon>)aClass {
NSDictionary *resultMap =
[GTLUtilities mergedClassDictionaryForSelector:@selector(propertyToJSONKeyMap)
startClass:aClass
ancestorClass:[GTLObject class]
cache:gJSONKeyMapCache];
return resultMap;
}
+ (NSDictionary *)arrayPropertyToClassMapForClass:(Class<GTLRuntimeCommon>)aClass {
NSDictionary *resultMap =
[GTLUtilities mergedClassDictionaryForSelector:@selector(arrayPropertyToClassMap)
startClass:aClass
ancestorClass:[GTLObject class]
cache:gArrayPropertyToClassMapCache];
return resultMap;
}
#pragma mark Runtime Support
+ (Class<GTLRuntimeCommon>)ancestorClass {
return [GTLObject class];
}
+ (BOOL)resolveInstanceMethod:(SEL)sel {
BOOL resolved = [GTLRuntimeCommon resolveInstanceMethod:sel onClass:self];
if (resolved)
return YES;
return [super resolveInstanceMethod:sel];
}
@end
@implementation GTLCollectionObject
// Subclasses must implement the items method dynamically.
- (void)dealloc {
[identifierMap_ release];
[super dealloc];
}
- (id)itemAtIndex:(NSUInteger)idx {
NSArray *items = [self performSelector:@selector(items)];
if (idx < [items count]) {
return [items objectAtIndex:idx];
}
return nil;
}
- (id)objectAtIndexedSubscript:(NSInteger)idx {
if (idx >= 0) {
return [self itemAtIndex:(NSUInteger)idx];
}
return nil;
}
- (id)itemForIdentifier:(NSString *)key {
if (identifierMap_ == nil) {
NSArray *items = [self performSelector:@selector(items)];
NSMutableDictionary *dict =
[NSMutableDictionary dictionaryWithCapacity:[items count]];
for (id item in items) {
id identifier = [item valueForKey:@"identifier"];
if (identifier != nil && identifier != [NSNull null]) {
if ([dict objectForKey:identifier] == nil) {
[dict setObject:item forKey:identifier];
}
}
}
identifierMap_ = [dict copy];
}
return [identifierMap_ objectForKey:key];
}
- (void)resetIdentifierMap {
[identifierMap_ release];
identifierMap_ = nil;
}
// NSFastEnumeration protocol
- (NSUInteger)countByEnumeratingWithState:(NSFastEnumerationState *)state
objects:(id *)stackbuf
count:(NSUInteger)len {
NSArray *items = [self performSelector:@selector(items)];
NSUInteger result = [items countByEnumeratingWithState:state
objects:stackbuf
count:len];
return result;
}
@end
@implementation GTLResultArray
- (NSArray *)itemsWithItemClass:(Class)itemClass {
// Return the cached array before creating on demand.
NSString *cacheKey = @"result_array_items";
NSMutableArray *cachedArray = [self cacheChildForKey:cacheKey];
if (cachedArray != nil) {
return cachedArray;
}
NSArray *result = nil;
NSArray *array = (NSArray *)[self JSON];
if (array != nil) {
if ([array isKindOfClass:[NSArray class]]) {
NSDictionary *surrogates = self.surrogates;
result = [GTLRuntimeCommon objectFromJSON:array
defaultClass:itemClass
surrogates:surrogates
isCacheable:NULL];
} else {
#if DEBUG
if (![array isKindOfClass:[NSNull class]]) {
GTL_DEBUG_LOG(@"GTLObject: unexpected JSON: %@ should be an array, actually is a %@:\n%@",
NSStringFromClass([self class]),
NSStringFromClass([array class]),
array);
}
#endif
result = array;
}
}
[self setCacheChild:result forKey:cacheKey];
return result;
}
@end