protobuf/objectivec/GPBExtensionRegistry.m

// Protocol Buffers - Google's data interchange format
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#import "GPBExtensionRegistry.h"

#import "GPBBootstrap.h"
#import "GPBDescriptor.h"

@implementation GPBExtensionRegistry {
  // TODO(dmaclach): Reimplement with CFDictionaries that don't use
  // objects as keys.
  NSMutableDictionary *mutableClassMap_;
}

- (instancetype)init {
  if ((self = [super init])) {
    mutableClassMap_ = [[NSMutableDictionary alloc] init];
  }
  return self;
}

- (void)dealloc {
  [mutableClassMap_ release];
  [super dealloc];
}

- (instancetype)copyWithZone:(NSZone *)zone {
  GPBExtensionRegistry *result = [[[self class] allocWithZone:zone] init];
  if (result && mutableClassMap_.count) {
    [result->mutableClassMap_ addEntriesFromDictionary:mutableClassMap_];
  }
  return result;
}

- (NSMutableDictionary *)extensionMapForContainingMessageClass:
        (Class)containingMessageClass {
  NSMutableDictionary *extensionMap =
      [mutableClassMap_ objectForKey:containingMessageClass];
  if (extensionMap == nil) {
    extensionMap = [NSMutableDictionary dictionary];
    [mutableClassMap_ setObject:extensionMap
                         forKey:(id<NSCopying>)containingMessageClass];
  }
  return extensionMap;
}

- (void)addExtension:(GPBExtensionDescriptor *)extension {
  if (extension == nil) {
    return;
  }

  Class containingMessageClass = extension.containingMessageClass;
  NSMutableDictionary *extensionMap =
      [self extensionMapForContainingMessageClass:containingMessageClass];
  [extensionMap setObject:extension forKey:@(extension.fieldNumber)];
}

- (GPBExtensionDescriptor *)extensionForDescriptor:(GPBDescriptor *)descriptor
                                       fieldNumber:(NSInteger)fieldNumber {
  Class messageClass = descriptor.messageClass;
  NSDictionary *extensionMap =
      [mutableClassMap_ objectForKey:messageClass];
  return [extensionMap objectForKey:@(fieldNumber)];
}

- (void)addExtensions:(GPBExtensionRegistry *)registry {
  if (registry == nil) {
    // In the case where there are no extensions just ignore.
    return;
  }
  NSMutableDictionary *otherClassMap = registry->mutableClassMap_;
  for (Class containingMessageClass in otherClassMap) {
    NSMutableDictionary *extensionMap =
        [self extensionMapForContainingMessageClass:containingMessageClass];
    NSMutableDictionary *otherExtensionMap =
        [registry extensionMapForContainingMessageClass:containingMessageClass];
    [extensionMap addEntriesFromDictionary:otherExtensionMap];
  }
}

@end