objectivec/GPBDescriptor.h - third_party/protobuf - Git at Google

 // 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>

 #import "GPBRuntimeTypes.h"

 @class GPBEnumDescriptor;
 @class GPBFieldDescriptor;
 @class GPBFileDescriptor;
 @class GPBOneofDescriptor;

 NS_ASSUME_NONNULL_BEGIN

 /** Syntax used in the proto file. */
 typedef NS_ENUM(uint8_t, GPBFileSyntax) {
   /** Unknown syntax. */
   GPBFileSyntaxUnknown = 0,
   /** Proto2 syntax. */
   GPBFileSyntaxProto2 = 2,
   /** Proto3 syntax. */
   GPBFileSyntaxProto3 = 3,
 };

 /** Type of proto field. */
 typedef NS_ENUM(uint8_t, GPBFieldType) {
   /** Optional/required field. Only valid for proto2 fields. */
   GPBFieldTypeSingle,
   /** Repeated field. */
   GPBFieldTypeRepeated,
   /** Map field. */
   GPBFieldTypeMap,
 };

 /**
  * Describes a proto message.
  **/
 @interface GPBDescriptor : NSObject <NSCopying>

 - (instancetype)init NS_UNAVAILABLE;
 + (instancetype)new NS_UNAVAILABLE;

 /** Name of the message. */
 @property(nonatomic, readonly, copy) NSString *name;
 /** Fields declared in the message. */
 @property(nonatomic, readonly, strong, nullable) NSArray<GPBFieldDescriptor *> *fields;
 /** Oneofs declared in the message. */
 @property(nonatomic, readonly, strong, nullable) NSArray<GPBOneofDescriptor *> *oneofs;
 /** Extension range declared for the message. */
 @property(nonatomic, readonly, nullable) const GPBExtensionRange *extensionRanges;
 /** Number of extension ranges declared for the message. */
 @property(nonatomic, readonly) uint32_t extensionRangesCount;
 /** Descriptor for the file where the message was defined. */
 @property(nonatomic, readonly) GPBFileDescriptor *file;

 /** Whether the message is in wire format or not. */
 @property(nonatomic, readonly, getter=isWireFormat) BOOL wireFormat;
 /** The class of this message. */
 @property(nonatomic, readonly) Class messageClass;
 /** Containing message descriptor if this message is nested, or nil otherwise. */
 @property(readonly, nullable) GPBDescriptor *containingType;
 /**
  * Fully qualified name for this message (package.message). Can be nil if the
  * value is unable to be computed.
  */
 @property(readonly, nullable) NSString *fullName;

 /**
  * Gets the field for the given number.
  *
  * @param fieldNumber The number for the field to get.
  *
  * @return The field descriptor for the given number, or nil if not found.
  **/
 - (nullable GPBFieldDescriptor *)fieldWithNumber:(uint32_t)fieldNumber;

 /**
  * Gets the field for the given name.
  *
  * @param name The name for the field to get.
  *
  * @return The field descriptor for the given name, or nil if not found.
  **/
 - (nullable GPBFieldDescriptor *)fieldWithName:(NSString *)name;

 /**
  * Gets the oneof for the given name.
  *
  * @param name The name for the oneof to get.
  *
  * @return The oneof descriptor for the given name, or nil if not found.
  **/
 - (nullable GPBOneofDescriptor *)oneofWithName:(NSString *)name;

 @end

 /**
  * Describes a proto file.
  **/
 @interface GPBFileDescriptor : NSObject

 - (instancetype)init NS_UNAVAILABLE;
 + (instancetype)new NS_UNAVAILABLE;

 /** The package declared in the proto file. */
 @property(nonatomic, readonly, copy) NSString *package;
 /** The objc prefix declared in the proto file. */
 @property(nonatomic, readonly, copy, nullable) NSString *objcPrefix;
 /**
  * The syntax of the proto file.
  *
  * This should not be used for making decisions about support
  * features/behaviors, what proto2 vs. proto3 syntax has meant has evolved over
  * time, and not more specific methods on the descriptors should be used
  * instead.
  */
 @property(nonatomic, readonly) GPBFileSyntax syntax
     __attribute__((deprecated("Syntax is not a good way to decide things about behaviors.")));

 @end

 /**
  * Describes a oneof field.
  **/
 @interface GPBOneofDescriptor : NSObject

 - (instancetype)init NS_UNAVAILABLE;
 + (instancetype)new NS_UNAVAILABLE;

 /** Name of the oneof field. */
 @property(nonatomic, readonly) NSString *name;
 /** Fields declared in the oneof. */
 @property(nonatomic, readonly) NSArray<GPBFieldDescriptor *> *fields;

 /**
  * Gets the field for the given number.
  *
  * @param fieldNumber The number for the field to get.
  *
  * @return The field descriptor for the given number, or nil if not found.
  **/
 - (nullable GPBFieldDescriptor *)fieldWithNumber:(uint32_t)fieldNumber;

 /**
  * Gets the field for the given name.
  *
  * @param name The name for the field to get.
  *
  * @return The field descriptor for the given name, or nil if not found.
  **/
 - (nullable GPBFieldDescriptor *)fieldWithName:(NSString *)name;

 @end

 /**
  * Describes a proto field.
  **/
 @interface GPBFieldDescriptor : NSObject

 - (instancetype)init NS_UNAVAILABLE;
 + (instancetype)new NS_UNAVAILABLE;

 /** Name of the field. */
 @property(nonatomic, readonly, copy) NSString *name;
 /** Number associated with the field. */
 @property(nonatomic, readonly) uint32_t number;
 /** Data type contained in the field. */
 @property(nonatomic, readonly) GPBDataType dataType;
 /** Whether it has a default value or not. */
 @property(nonatomic, readonly) BOOL hasDefaultValue;
 /** Default value for the field. */
 @property(nonatomic, readonly) GPBGenericValue defaultValue;
 /** Whether this field is required. Only valid for proto2 fields. */
 @property(nonatomic, readonly, getter=isRequired) BOOL required;
 /** Whether this field is optional. */
 @property(nonatomic, readonly, getter=isOptional) BOOL optional;
 /** Type of field (single, repeated, map). */
 @property(nonatomic, readonly) GPBFieldType fieldType;
 /** Type of the key if the field is a map. The value's type is -dataType. */
 @property(nonatomic, readonly) GPBDataType mapKeyDataType;
 /** Whether the field is packable. */
 @property(nonatomic, readonly, getter=isPackable) BOOL packable;

 /** The containing oneof if this field is part of one, nil otherwise. */
 @property(nonatomic, readonly, nullable) GPBOneofDescriptor *containingOneof;

 /** Class of the message if the field is of message type. */
 @property(nonatomic, readonly, nullable) Class msgClass;

 /** Descriptor for the enum if this field is an enum. */
 @property(nonatomic, readonly, strong, nullable) GPBEnumDescriptor *enumDescriptor;

 /**
  * Checks whether the given enum raw value is a valid enum value.
  *
  * @param value The raw enum value to check.
  *
  * @return YES if value is a valid enum raw value.
  **/
 - (BOOL)isValidEnumValue:(int32_t)value;

 /** @return Name for the text format, or nil if not known. */
 - (nullable NSString *)textFormatName;

 @end

 /**
  * Describes a proto enum.
  **/
 @interface GPBEnumDescriptor : NSObject

 - (instancetype)init NS_UNAVAILABLE;
 + (instancetype)new NS_UNAVAILABLE;

 /** Name of the enum. */
 @property(nonatomic, readonly, copy) NSString *name;
 /** Function that validates that raw values are valid enum values. */
 @property(nonatomic, readonly) GPBEnumValidationFunc enumVerifier;
 /**
  * Is this a closed enum, meaning that it:
  * - Has a fixed set of named values.
  * - Encountering values not in this set causes them to be treated as unknown
  *   fields.
  * - The first value (i.e., the default) may be nonzero.
  *
  * NOTE: This is only accurate if the generate sources for a proto file were
  * generated with a protobuf release after the v21.9 version, as the ObjC
  * generator wasn't capturing this information.
  */
 @property(nonatomic, readonly) BOOL isClosed;

 /**
  * Returns the enum value name for the given raw enum.
  *
  * Note that there can be more than one name corresponding to a given value
  * if the allow_alias option is used.
  *
  * @param number The raw enum value.
  *
  * @return The first name that matches the enum value passed, or nil if not valid.
  **/
 - (nullable NSString *)enumNameForValue:(int32_t)number;

 /**
  * Gets the enum raw value for the given enum name.
  *
  * @param outValue A pointer where the value will be set.
  * @param name     The enum name for which to get the raw value.
  *
  * @return YES if a value was copied into the pointer, NO otherwise.
  **/
 - (BOOL)getValue:(nullable int32_t *)outValue forEnumName:(NSString *)name;

 /**
  * Returns the text format for the given raw enum value.
  *
  * @param number The raw enum value.
  *
  * @return The first text format name which matches the enum value, or nil if not valid.
  **/
 - (nullable NSString *)textFormatNameForValue:(int32_t)number;

 /**
  * Gets the enum raw value for the given text format name.
  *
  * @param outValue       A pointer where the value will be set.
  * @param textFormatName The text format name for which to get the raw value.
  *
  * @return YES if a value was copied into the pointer, NO otherwise.
  **/
 - (BOOL)getValue:(nullable int32_t *)outValue forEnumTextFormatName:(NSString *)textFormatName;

 /**
  * Gets the number of defined enum names.
  *
  * @return Count of the number of enum names, including any aliases.
  */
 @property(nonatomic, readonly) uint32_t enumNameCount;

 /**
  * Gets the enum name corresponding to the given index.
  *
  * @param index Index into the available names.  The defined range is from 0
  *              to self.enumNameCount - 1.
  *
  * @returns The enum name at the given index, or nil if the index is out of range.
  */
 - (nullable NSString *)getEnumNameForIndex:(uint32_t)index;

 /**
  * Gets the enum text format name corresponding to the given index.
  *
  * @param index Index into the available names.  The defined range is from 0
  *              to self.enumNameCount - 1.
  *
  * @returns The text format name at the given index, or nil if the index is out of range.
  */
 - (nullable NSString *)getEnumTextFormatNameForIndex:(uint32_t)index;

 @end

 /**
  * Describes a proto extension.
  **/
 @interface GPBExtensionDescriptor : NSObject <NSCopying>

 - (instancetype)init NS_UNAVAILABLE;
 + (instancetype)new NS_UNAVAILABLE;

 /** Field number under which the extension is stored. */
 @property(nonatomic, readonly) uint32_t fieldNumber;
 /** The containing message class, i.e. the class extended by this extension. */
 @property(nonatomic, readonly) Class containingMessageClass;
 /** Data type contained in the extension. */
 @property(nonatomic, readonly) GPBDataType dataType;
 /** Whether the extension is repeated. */
 @property(nonatomic, readonly, getter=isRepeated) BOOL repeated;
 /** Whether the extension is packable. */
 @property(nonatomic, readonly, getter=isPackable) BOOL packable;
 /** The class of the message if the extension is of message type. */
 @property(nonatomic, readonly) Class msgClass;
 /** The singleton name for the extension. */
 @property(nonatomic, readonly) NSString *singletonName;
 /** The enum descriptor if the extension is of enum type. */
 @property(nonatomic, readonly, strong, nullable) GPBEnumDescriptor *enumDescriptor;
 /** The default value for the extension. */
 @property(nonatomic, readonly, nullable) id defaultValue;

 @end

 NS_ASSUME_NONNULL_END
	// 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>

	#import "GPBRuntimeTypes.h"

	@class GPBEnumDescriptor;
	@class GPBFieldDescriptor;
	@class GPBFileDescriptor;
	@class GPBOneofDescriptor;

	NS_ASSUME_NONNULL_BEGIN

	/** Syntax used in the proto file. */
	typedef NS_ENUM(uint8_t, GPBFileSyntax) {
	/** Unknown syntax. */
	GPBFileSyntaxUnknown = 0,
	/** Proto2 syntax. */
	GPBFileSyntaxProto2 = 2,
	/** Proto3 syntax. */
	GPBFileSyntaxProto3 = 3,
	};

	/** Type of proto field. */
	typedef NS_ENUM(uint8_t, GPBFieldType) {
	/** Optional/required field. Only valid for proto2 fields. */
	GPBFieldTypeSingle,
	/** Repeated field. */
	GPBFieldTypeRepeated,
	/** Map field. */
	GPBFieldTypeMap,
	};

	/**
	* Describes a proto message.
	**/
	@interface GPBDescriptor : NSObject <NSCopying>

	- (instancetype)init NS_UNAVAILABLE;
	+ (instancetype)new NS_UNAVAILABLE;

	/** Name of the message. */
	@property(nonatomic, readonly, copy) NSString *name;
	/** Fields declared in the message. */
	@property(nonatomic, readonly, strong, nullable) NSArray<GPBFieldDescriptor > fields;
	/** Oneofs declared in the message. */
	@property(nonatomic, readonly, strong, nullable) NSArray<GPBOneofDescriptor > oneofs;
	/** Extension range declared for the message. */
	@property(nonatomic, readonly, nullable) const GPBExtensionRange *extensionRanges;
	/** Number of extension ranges declared for the message. */
	@property(nonatomic, readonly) uint32_t extensionRangesCount;
	/** Descriptor for the file where the message was defined. */
	@property(nonatomic, readonly) GPBFileDescriptor *file;

	/** Whether the message is in wire format or not. */
	@property(nonatomic, readonly, getter=isWireFormat) BOOL wireFormat;
	/** The class of this message. */
	@property(nonatomic, readonly) Class messageClass;
	/** Containing message descriptor if this message is nested, or nil otherwise. */
	@property(readonly, nullable) GPBDescriptor *containingType;
	/**
	* Fully qualified name for this message (package.message). Can be nil if the
	* value is unable to be computed.
	*/
	@property(readonly, nullable) NSString *fullName;

	/**
	* Gets the field for the given number.
	*
	* @param fieldNumber The number for the field to get.
	*
	* @return The field descriptor for the given number, or nil if not found.
	**/
	- (nullable GPBFieldDescriptor *)fieldWithNumber:(uint32_t)fieldNumber;

	/**
	* Gets the field for the given name.
	*
	* @param name The name for the field to get.
	*
	* @return The field descriptor for the given name, or nil if not found.
	**/
	- (nullable GPBFieldDescriptor )fieldWithName:(NSString )name;

	/**
	* Gets the oneof for the given name.
	*
	* @param name The name for the oneof to get.
	*
	* @return The oneof descriptor for the given name, or nil if not found.
	**/
	- (nullable GPBOneofDescriptor )oneofWithName:(NSString )name;

	@end

	/**
	* Describes a proto file.
	**/
	@interface GPBFileDescriptor : NSObject

	- (instancetype)init NS_UNAVAILABLE;
	+ (instancetype)new NS_UNAVAILABLE;

	/** The package declared in the proto file. */
	@property(nonatomic, readonly, copy) NSString *package;
	/** The objc prefix declared in the proto file. */
	@property(nonatomic, readonly, copy, nullable) NSString *objcPrefix;
	/**
	* The syntax of the proto file.
	*
	* This should not be used for making decisions about support
	* features/behaviors, what proto2 vs. proto3 syntax has meant has evolved over
	* time, and not more specific methods on the descriptors should be used
	* instead.
	*/
	@property(nonatomic, readonly) GPBFileSyntax syntax
	__attribute__((deprecated("Syntax is not a good way to decide things about behaviors.")));

	@end

	/**
	* Describes a oneof field.
	**/
	@interface GPBOneofDescriptor : NSObject

	- (instancetype)init NS_UNAVAILABLE;
	+ (instancetype)new NS_UNAVAILABLE;

	/** Name of the oneof field. */
	@property(nonatomic, readonly) NSString *name;
	/** Fields declared in the oneof. */
	@property(nonatomic, readonly) NSArray<GPBFieldDescriptor > fields;

	/**
	* Gets the field for the given number.
	*
	* @param fieldNumber The number for the field to get.
	*
	* @return The field descriptor for the given number, or nil if not found.
	**/
	- (nullable GPBFieldDescriptor *)fieldWithNumber:(uint32_t)fieldNumber;

	/**
	* Gets the field for the given name.
	*
	* @param name The name for the field to get.
	*
	* @return The field descriptor for the given name, or nil if not found.
	**/
	- (nullable GPBFieldDescriptor )fieldWithName:(NSString )name;

	@end

	/**
	* Describes a proto field.
	**/
	@interface GPBFieldDescriptor : NSObject

	- (instancetype)init NS_UNAVAILABLE;
	+ (instancetype)new NS_UNAVAILABLE;

	/** Name of the field. */
	@property(nonatomic, readonly, copy) NSString *name;
	/** Number associated with the field. */
	@property(nonatomic, readonly) uint32_t number;
	/** Data type contained in the field. */
	@property(nonatomic, readonly) GPBDataType dataType;
	/** Whether it has a default value or not. */
	@property(nonatomic, readonly) BOOL hasDefaultValue;
	/** Default value for the field. */
	@property(nonatomic, readonly) GPBGenericValue defaultValue;
	/** Whether this field is required. Only valid for proto2 fields. */
	@property(nonatomic, readonly, getter=isRequired) BOOL required;
	/** Whether this field is optional. */
	@property(nonatomic, readonly, getter=isOptional) BOOL optional;
	/** Type of field (single, repeated, map). */
	@property(nonatomic, readonly) GPBFieldType fieldType;
	/** Type of the key if the field is a map. The value's type is -dataType. */
	@property(nonatomic, readonly) GPBDataType mapKeyDataType;
	/** Whether the field is packable. */
	@property(nonatomic, readonly, getter=isPackable) BOOL packable;

	/** The containing oneof if this field is part of one, nil otherwise. */
	@property(nonatomic, readonly, nullable) GPBOneofDescriptor *containingOneof;

	/** Class of the message if the field is of message type. */
	@property(nonatomic, readonly, nullable) Class msgClass;

	/** Descriptor for the enum if this field is an enum. */
	@property(nonatomic, readonly, strong, nullable) GPBEnumDescriptor *enumDescriptor;

	/**
	* Checks whether the given enum raw value is a valid enum value.
	*
	* @param value The raw enum value to check.
	*
	* @return YES if value is a valid enum raw value.
	**/
	- (BOOL)isValidEnumValue:(int32_t)value;

	/** @return Name for the text format, or nil if not known. */
	- (nullable NSString *)textFormatName;

	@end

	/**
	* Describes a proto enum.
	**/
	@interface GPBEnumDescriptor : NSObject

	- (instancetype)init NS_UNAVAILABLE;
	+ (instancetype)new NS_UNAVAILABLE;

	/** Name of the enum. */
	@property(nonatomic, readonly, copy) NSString *name;
	/** Function that validates that raw values are valid enum values. */
	@property(nonatomic, readonly) GPBEnumValidationFunc enumVerifier;
	/**
	* Is this a closed enum, meaning that it:
	* - Has a fixed set of named values.
	* - Encountering values not in this set causes them to be treated as unknown
	* fields.
	* - The first value (i.e., the default) may be nonzero.
	*
	* NOTE: This is only accurate if the generate sources for a proto file were
	* generated with a protobuf release after the v21.9 version, as the ObjC
	* generator wasn't capturing this information.
	*/
	@property(nonatomic, readonly) BOOL isClosed;

	/**
	* Returns the enum value name for the given raw enum.
	*
	* Note that there can be more than one name corresponding to a given value
	* if the allow_alias option is used.
	*
	* @param number The raw enum value.
	*
	* @return The first name that matches the enum value passed, or nil if not valid.
	**/
	- (nullable NSString *)enumNameForValue:(int32_t)number;

	/**
	* Gets the enum raw value for the given enum name.
	*
	* @param outValue A pointer where the value will be set.
	* @param name The enum name for which to get the raw value.
	*
	* @return YES if a value was copied into the pointer, NO otherwise.
	**/
	- (BOOL)getValue:(nullable int32_t )outValue forEnumName:(NSString )name;

	/**
	* Returns the text format for the given raw enum value.
	*
	* @param number The raw enum value.
	*
	* @return The first text format name which matches the enum value, or nil if not valid.
	**/
	- (nullable NSString *)textFormatNameForValue:(int32_t)number;

	/**
	* Gets the enum raw value for the given text format name.
	*
	* @param outValue A pointer where the value will be set.
	* @param textFormatName The text format name for which to get the raw value.
	*
	* @return YES if a value was copied into the pointer, NO otherwise.
	**/
	- (BOOL)getValue:(nullable int32_t )outValue forEnumTextFormatName:(NSString )textFormatName;

	/**
	* Gets the number of defined enum names.
	*
	* @return Count of the number of enum names, including any aliases.
	*/
	@property(nonatomic, readonly) uint32_t enumNameCount;

	/**
	* Gets the enum name corresponding to the given index.
	*
	* @param index Index into the available names. The defined range is from 0
	* to self.enumNameCount - 1.
	*
	* @returns The enum name at the given index, or nil if the index is out of range.
	*/
	- (nullable NSString *)getEnumNameForIndex:(uint32_t)index;

	/**
	* Gets the enum text format name corresponding to the given index.
	*
	* @param index Index into the available names. The defined range is from 0
	* to self.enumNameCount - 1.
	*
	* @returns The text format name at the given index, or nil if the index is out of range.
	*/
	- (nullable NSString *)getEnumTextFormatNameForIndex:(uint32_t)index;

	@end

	/**
	* Describes a proto extension.
	**/
	@interface GPBExtensionDescriptor : NSObject <NSCopying>

	- (instancetype)init NS_UNAVAILABLE;
	+ (instancetype)new NS_UNAVAILABLE;

	/** Field number under which the extension is stored. */
	@property(nonatomic, readonly) uint32_t fieldNumber;
	/** The containing message class, i.e. the class extended by this extension. */
	@property(nonatomic, readonly) Class containingMessageClass;
	/** Data type contained in the extension. */
	@property(nonatomic, readonly) GPBDataType dataType;
	/** Whether the extension is repeated. */
	@property(nonatomic, readonly, getter=isRepeated) BOOL repeated;
	/** Whether the extension is packable. */
	@property(nonatomic, readonly, getter=isPackable) BOOL packable;
	/** The class of the message if the extension is of message type. */
	@property(nonatomic, readonly) Class msgClass;
	/** The singleton name for the extension. */
	@property(nonatomic, readonly) NSString *singletonName;
	/** The enum descriptor if the extension is of enum type. */
	@property(nonatomic, readonly, strong, nullable) GPBEnumDescriptor *enumDescriptor;
	/** The default value for the extension. */
	@property(nonatomic, readonly, nullable) id defaultValue;

	@end

	NS_ASSUME_NONNULL_END