1// Protocol Buffers - Google's data interchange format
2// Copyright 2008 Google Inc.  All rights reserved.
3// https://developers.google.com/protocol-buffers/
4//
5// Redistribution and use in source and binary forms, with or without
6// modification, are permitted provided that the following conditions are
7// met:
8//
9//     * Redistributions of source code must retain the above copyright
10// notice, this list of conditions and the following disclaimer.
11//     * Redistributions in binary form must reproduce the above
12// copyright notice, this list of conditions and the following disclaimer
13// in the documentation and/or other materials provided with the
14// distribution.
15//     * Neither the name of Google Inc. nor the names of its
16// contributors may be used to endorse or promote products derived from
17// this software without specific prior written permission.
18//
19// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30
31#import "GPBExtensionRegistry.h"
32
33#import "GPBBootstrap.h"
34#import "GPBDescriptor.h"
35
36@implementation GPBExtensionRegistry {
37  // TODO(dmaclach): Reimplement with CFDictionaries that don't use
38  // objects as keys.
39  NSMutableDictionary *mutableClassMap_;
40}
41
42- (instancetype)init {
43  if ((self = [super init])) {
44    mutableClassMap_ = [[NSMutableDictionary alloc] init];
45  }
46  return self;
47}
48
49- (void)dealloc {
50  [mutableClassMap_ release];
51  [super dealloc];
52}
53
54// Direct access is use for speed, to avoid even internally declaring things
55// read/write, etc. The warning is enabled in the project to ensure code calling
56// protos can turn on -Wdirect-ivar-access without issues.
57#pragma clang diagnostic push
58#pragma clang diagnostic ignored "-Wdirect-ivar-access"
59
60- (instancetype)copyWithZone:(NSZone *)zone {
61  GPBExtensionRegistry *result = [[[self class] allocWithZone:zone] init];
62  if (result && mutableClassMap_.count) {
63    [result->mutableClassMap_ addEntriesFromDictionary:mutableClassMap_];
64  }
65  return result;
66}
67
68- (NSMutableDictionary *)extensionMapForContainingMessageClass:
69        (Class)containingMessageClass {
70  NSMutableDictionary *extensionMap =
71      [mutableClassMap_ objectForKey:containingMessageClass];
72  if (extensionMap == nil) {
73    extensionMap = [NSMutableDictionary dictionary];
74    [mutableClassMap_ setObject:extensionMap
75                         forKey:(id<NSCopying>)containingMessageClass];
76  }
77  return extensionMap;
78}
79
80- (void)addExtension:(GPBExtensionDescriptor *)extension {
81  if (extension == nil) {
82    return;
83  }
84
85  Class containingMessageClass = extension.containingMessageClass;
86  NSMutableDictionary *extensionMap =
87      [self extensionMapForContainingMessageClass:containingMessageClass];
88  [extensionMap setObject:extension forKey:@(extension.fieldNumber)];
89}
90
91- (GPBExtensionDescriptor *)extensionForDescriptor:(GPBDescriptor *)descriptor
92                                       fieldNumber:(NSInteger)fieldNumber {
93  Class messageClass = descriptor.messageClass;
94  NSDictionary *extensionMap =
95      [mutableClassMap_ objectForKey:messageClass];
96  return [extensionMap objectForKey:@(fieldNumber)];
97}
98
99- (void)addExtensions:(GPBExtensionRegistry *)registry {
100  if (registry == nil) {
101    // In the case where there are no extensions just ignore.
102    return;
103  }
104  NSMutableDictionary *otherClassMap = registry->mutableClassMap_;
105  for (Class containingMessageClass in otherClassMap) {
106    NSMutableDictionary *extensionMap =
107        [self extensionMapForContainingMessageClass:containingMessageClass];
108    NSMutableDictionary *otherExtensionMap =
109        [registry extensionMapForContainingMessageClass:containingMessageClass];
110    [extensionMap addEntriesFromDictionary:otherExtensionMap];
111  }
112}
113
114#pragma clang diagnostic pop
115
116@end
117