/*
* Copyright (c) 2008-2024 Jonathan Schleifer <js@nil.im>
*
* All rights reserved.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License version 3.0 only,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* version 3.0 for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* version 3.0 along with this program. If not, see
* <https://www.gnu.org/licenses/>.
*/
#import "OFObject.h"
#import "OFEnumerator.h"
OF_ASSUME_NONNULL_BEGIN
/** @file */
/**
* @struct OFMapTableFunctions OFMapTable.h ObjFW/OFMapTable.h
*
* @brief A struct describing the functions to be used by the map table.
*/
typedef struct {
/** The function to retain keys / objects */
void *_Nullable (*_Nullable retain)(void *_Nullable object);
/** The function to release keys / objects */
void (*_Nullable release)(void *_Nullable object);
/** The function to hash keys */
unsigned long (*_Nullable hash)(void *_Nullable object);
/** The function to compare keys / objects */
bool (*_Nullable equal)(void *_Nullable object1,
void *_Nullable object2);
} OFMapTableFunctions;
#ifdef OF_HAVE_BLOCKS
/**
* @brief A block for enumerating an OFMapTable.
*
* @param key The current key
* @param object The current object
* @param stop A pointer to a variable that can be set to true to stop the
* enumeration
*/
typedef void (^OFMapTableEnumerationBlock)(void *_Nullable key,
void *_Nullable object, bool *stop);
/**
* @brief A block for replacing objects in an OFMapTable.
*
* @param key The key of the object to replace
* @param object The object to replace
* @return The object to replace the object with
*/
typedef void *_Nullable (^OFMapTableReplaceBlock)(void *_Nullable key,
void *_Nullable object);
#endif
@class OFMapTableEnumerator;
/**
* @class OFMapTable OFMapTable.h ObjFW/OFMapTable.h
*
* @brief A class similar to OFDictionary, but providing more options how keys
* and objects should be retained, released, compared and hashed.
*/
OF_SUBCLASSING_RESTRICTED
@interface OFMapTable: OFObject <OFCopying, OFFastEnumeration>
{
OFMapTableFunctions _keyFunctions, _objectFunctions;
struct OFMapTableBucket *_Nonnull *_Nullable _buckets;
uint32_t _count, _capacity;
unsigned char _rotation;
unsigned long _mutations;
}
/**
* @brief The key functions used by the map table.
*/
@property (readonly, nonatomic) OFMapTableFunctions keyFunctions;
/**
* @brief The object functions used by the map table.
*/
@property (readonly, nonatomic) OFMapTableFunctions objectFunctions;
/**
* @brief The number of objects in the map table.
*/
@property (readonly, nonatomic) size_t count;
/**
* @brief Creates a new OFMapTable with the specified key and object functions.
*
* @param keyFunctions A structure of functions for handling keys
* @param objectFunctions A structure of functions for handling objects
* @return A new autoreleased OFMapTable
*/
+ (instancetype)mapTableWithKeyFunctions: (OFMapTableFunctions)keyFunctions
objectFunctions: (OFMapTableFunctions)objectFunctions;
/**
* @brief Creates a new OFMapTable with the specified key functions, object
* functions and capacity.
*
* @param keyFunctions A structure of functions for handling keys
* @param objectFunctions A structure of functions for handling objects
* @param capacity A hint about the count of elements expected to be in the map
* table
* @return A new autoreleased OFMapTable
*/
+ (instancetype)mapTableWithKeyFunctions: (OFMapTableFunctions)keyFunctions
objectFunctions: (OFMapTableFunctions)objectFunctions
capacity: (size_t)capacity;
- (instancetype)init OF_UNAVAILABLE;
/**
* @brief Initializes an already allocated OFMapTable with the specified key
* and object functions.
*
* @param keyFunctions A structure of functions for handling keys
* @param objectFunctions A structure of functions for handling objects
* @return An initialized OFMapTable
*/
- (instancetype)initWithKeyFunctions: (OFMapTableFunctions)keyFunctions
objectFunctions: (OFMapTableFunctions)objectFunctions;
/**
* @brief Initializes an already allocated OFMapTable with the specified key
* functions, object functions and capacity.
*
* @param keyFunctions A structure of functions for handling keys
* @param objectFunctions A structure of functions for handling objects
* @param capacity A hint about the count of elements expected to be in the map
* table
* @return An initialized OFMapTable
*/
- (instancetype)initWithKeyFunctions: (OFMapTableFunctions)keyFunctions
objectFunctions: (OFMapTableFunctions)objectFunctions
capacity: (size_t)capacity
OF_DESIGNATED_INITIALIZER;
/**
* @brief Returns the object for the given key or NULL if the key was not found.
*
* @param key The key whose object should be returned
* @return The object for the given key or NULL if the key was not found
*/
- (nullable void *)objectForKey: (void *)key;
/**
* @brief Sets an object for a key.
*
* @param key The key to set
* @param object The object to set the key to
*/
- (void)setObject: (nullable void *)object forKey: (nullable void *)key;
/**
* @brief Removes the object for the specified key from the map table.
*
* @param key The key whose object should be removed
*/
- (void)removeObjectForKey: (nullable void *)key;
/**
* @brief Removes all objects.
*/
- (void)removeAllObjects;
/**
* @brief Checks whether the map table contains an object equal to the
* specified object.
*
* @param object The object which is checked for being in the map table
* @return A boolean whether the map table contains the specified object
*/
- (bool)containsObject: (nullable void *)object;
/**
* @brief Checks whether the map table contains an object with the specified
* address.
*
* @param object The object which is checked for being in the map table
* @return A boolean whether the map table contains an object with the
* specified address.
*/
- (bool)containsObjectIdenticalTo: (nullable void *)object;
/**
* @brief Returns an OFMapTableEnumerator to enumerate through the map table's
* keys.
*
* @return An OFMapTableEnumerator to enumerate through the map table's keys
*/
- (OFMapTableEnumerator *)keyEnumerator;
/**
* @brief Returns an OFMapTableEnumerator to enumerate through the map table's
* objects.
*
* @return An OFMapTableEnumerator to enumerate through the map table's objects
*/
- (OFMapTableEnumerator *)objectEnumerator;
#ifdef OF_HAVE_BLOCKS
/**
* @brief Executes a block for each key / object pair.
*
* @param block The block to execute for each key / object pair.
*/
- (void)enumerateKeysAndObjectsUsingBlock: (OFMapTableEnumerationBlock)block;
/**
* @brief Replaces each object with the object returned by the block.
*
* @param block The block which returns a new object for each object
*/
- (void)replaceObjectsUsingBlock: (OFMapTableReplaceBlock)block;
#endif
@end
/**
* @class OFMapTableEnumerator OFMapTable.h ObjFW/OFMapTable.h
*
* @brief A class which provides methods to enumerate through an OFMapTable's
* keys or objects.
*/
#ifndef OF_MAP_TABLE_M
OF_SUBCLASSING_RESTRICTED
#endif
@interface OFMapTableEnumerator: OFObject
{
OFMapTable *_mapTable;
struct OFMapTableBucket *_Nonnull *_Nullable _buckets;
uint32_t _capacity;
unsigned long _mutations, *_Nullable _mutationsPtr, _position;
}
- (instancetype)init OF_UNAVAILABLE;
/**
* @brief Returns a pointer to the next object, or NULL if the enumeration
* finished.
*
* @return The next object
*/
- (void *_Nullable *_Nullable)nextObject;
@end
OF_ASSUME_NONNULL_END