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// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
// https://developers.google.com/protocol-buffers/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#import <Foundation/Foundation.h>
@class GPBDescriptor;
@class GPBExtensionDescriptor;
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
/// @c 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.
///
/// The @c *Root classes provide @c +extensionRegistry for the extensions defined
/// in a given file *and* all files it imports. You can also create a
/// @c GPBExtensionRegistry, and merge those registries to handle parsing
/// extensions defined from non overlapping files.
///
/// @code
/// GPBExtensionRegistry *registry =
/// [[[MyProtoFileRoot extensionRegistry] copy] autorelease];
/// [registry addExtension:[OtherMessage neededExtension]; // Not in MyProtoFile
/// NSError *parseError = nil;
/// MyMessage *msg = [MyMessage parseData:data
/// extensionRegistry:registry
/// error:&parseError];
/// @endcode
@interface GPBExtensionRegistry : NSObject<NSCopying>
/// Add the given @c 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;
/// Looks for the extension registered for the given field number on a given
/// @c GPBDescriptor.
///
/// @param descriptor The descriptor to look for a registered extension on.
/// @param fieldNumber The field number of an extension to look for.
///
/// @return The registered @c GPBExtensionDescripto or nil if none was found.
- (nullable GPBExtensionDescriptor *)extensionForDescriptor:(GPBDescriptor *)descriptor
fieldNumber:(NSInteger)fieldNumber;
@end
NS_ASSUME_NONNULL_END
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