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// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file or at
// https://developers.google.com/open-source/licenses/bsd
#import <Foundation/Foundation.h>
#import "GPBDescriptor.h"
NS_ASSUME_NONNULL_BEGIN
/**
* A table of known extensions, searchable by name or field number. When
* parsing a protocol message that might have extensions, you must provide a
* GPBExtensionRegistry in which you have registered any extensions that you
* want to be able to parse. Otherwise, those extensions will just be treated
* like unknown fields.
**/
@protocol GPBExtensionRegistry <NSObject>
/**
* Looks for the extension registered for the given field number on a given
* GPBDescriptor.
*
* @param descriptor The descriptor to look for a registered extension on.
* @param fieldNumber The field number of the extension to look for.
*
* @return The registered GPBExtensionDescriptor or nil if none was found.
**/
- (nullable GPBExtensionDescriptor *)extensionForDescriptor:(GPBDescriptor *)descriptor
fieldNumber:(NSInteger)fieldNumber;
@end
/**
* A concrete implementation of `GPBExtensionRegistry`.
*
* The *Root classes provide `+extensionRegistry` for the extensions defined
* in a given file *and* all files it imports. You can also create a
* GPBExtensionRegistry, and merge those registries to handle parsing
* extensions defined from non overlapping files.
*
* ```
* GPBExtensionRegistry *registry = [[MyProtoFileRoot extensionRegistry] copy];
* [registry addExtension:[OtherMessage neededExtension]]; // Not in MyProtoFile
* NSError *parseError;
* MyMessage *msg = [MyMessage parseData:data extensionRegistry:registry error:&parseError];
* ```
**/
__attribute__((objc_subclassing_restricted))
@interface GPBExtensionRegistry : NSObject<NSCopying, GPBExtensionRegistry>
/**
* Adds the given GPBExtensionDescriptor to this registry.
*
* @param extension The extension description to add.
**/
- (void)addExtension:(GPBExtensionDescriptor *)extension;
/**
* Adds all the extensions from another registry to this registry.
*
* @param registry The registry to merge into this registry.
**/
- (void)addExtensions:(GPBExtensionRegistry *)registry;
@end
NS_ASSUME_NONNULL_END
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