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