protobuf/objectivec/GPBExtensionRegistry.m

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

#import "GPBBootstrap.h"
#import "GPBDescriptor.h"
#import "GPBExtensionField.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];
}

- (NSMutableDictionary *)extensionMapForContainingType:
        (GPBDescriptor *)containingType {
  NSMutableDictionary *extensionMap =
      [mutableClassMap_ objectForKey:containingType];
  if (extensionMap == nil) {
    extensionMap = [NSMutableDictionary dictionary];
    [mutableClassMap_ setObject:extensionMap forKey:containingType];
  }
  return extensionMap;
}

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

  GPBDescriptor *containingType = [extension containingType];
  NSMutableDictionary *extensionMap =
      [self extensionMapForContainingType:containingType];
  [extensionMap setObject:extension forKey:@([extension fieldNumber])];
}

- (GPBExtensionField *)getExtension:(GPBDescriptor *)containingType
                        fieldNumber:(NSInteger)fieldNumber {
  NSDictionary *extensionMap = [mutableClassMap_ objectForKey:containingType];
  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 (GPBDescriptor *containingType in otherClassMap) {
    NSMutableDictionary *extensionMap =
        [self extensionMapForContainingType:containingType];
    NSMutableDictionary *otherExtensionMap =
        [registry extensionMapForContainingType:containingType];
    [extensionMap addEntriesFromDictionary:otherExtensionMap];
  }
}

@end