/*
* Copyright (c) 2008-2022 Jonathan Schleifer <js@nil.im>
*
* All rights reserved.
*
* This file is part of ObjFW. It may be distributed under the terms of the
* Q Public License 1.0, which can be found in the file LICENSE.QPL included in
* the packaging of this file.
*
* Alternatively, it may be distributed under the terms of the GNU General
* Public License, either version 2 or 3, which can be found in the file
* LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
* file.
*/
#import "OFFileManager.h"
#import "OFObject.h"
#import "OFString.h"
OF_ASSUME_NONNULL_BEGIN
@class OFArray OF_GENERIC(ObjectType);
@class OFDate;
@class OFStream;
@class OFURI;
/**
* @class OFURIHandler OFURIHandler.h ObjFW/OFURIHandler.h
*
* @brief A handler for a URI scheme.
*/
@interface OFURIHandler: OFObject
{
OFString *_scheme;
OF_RESERVE_IVARS(OFURIHandler, 4)
}
/**
* @brief The scheme this OFURIHandler handles.
*/
@property (readonly, nonatomic) OFString *scheme;
/**
* @brief Registers the specified class as the handler for the specified scheme.
*
* If the same class is specified for two schemes, one instance of it is
* created per scheme.
*
* @param class_ The class to register as the handler for the specified scheme
* @param scheme The scheme for which to register the handler
* @return Whether the class was successfully registered. If a handler for the
* same scheme is already registered, registration fails.
*/
+ (bool)registerClass: (Class)class_ forScheme: (OFString *)scheme;
/**
* @brief Returns the handler for the specified URI.
*
* @return The handler for the specified URI.
*/
+ (OFURIHandler *)handlerForURI: (OFURI *)URI;
/**
* @brief Opens the item at the specified URI.
*
* @param URI The URI of the item which should be opened
* @param mode The mode in which the file should be opened.@n
* Possible modes are:
* @n
* Mode | Description
* ---------------|-------------------------------------
* `r` | Read-only
* `r+` | Read-write
* `w` | Write-only, create or truncate
* `wx` | Write-only, create or fail, exclusive
* `w+` | Read-write, create or truncate
* `w+x` | Read-write, create or fail, exclusive
* `a` | Write-only, create or append
* `a+` | Read-write, create or append
* @n
* The handler is allowed to not implement all modes and is also
* allowed to implement additional, scheme-specific modes.
* @return The opened stream if it was successfully opened
* @throw OFOpenItemFailedException Opening the item failed
*/
+ (OFStream *)openItemAtURI: (OFURI *)URI mode: (OFString *)mode;
- (instancetype)init OF_UNAVAILABLE;
/**
* @brief Initializes the handler for the specified scheme.
*
* @param scheme The scheme to initialize for
* @return An initialized URI handler
*/
- (instancetype)initWithScheme: (OFString *)scheme OF_DESIGNATED_INITIALIZER;
/**
* @brief Opens the item at the specified URI.
*
* @param URI The URI of the item which should be opened
* @param mode The mode in which the file should be opened.@n
* Possible modes are:
* @n
* Mode | Description
* ---------------|-------------------------------------
* `r` | Read-only
* `r+` | Read-write
* `w` | Write-only, create or truncate
* `wx` | Write-only, create or fail, exclusive
* `w+` | Read-write, create or truncate
* `w+x` | Read-write, create or fail, exclusive
* `a` | Write-only, create or append
* `a+` | Read-write, create or append
* @n
* The handler is allowed to not implement all modes and is also
* allowed to implement additional, scheme-specific modes.
* @return The opened stream if it was successfully opened
* @throw OFOpenItemFailedException Opening the item failed
*/
- (OFStream *)openItemAtURI: (OFURI *)URI mode: (OFString *)mode;
/**
* @brief Returns the attributes for the item at the specified URI.
*
* @param URI The URI to return the attributes for
* @return A dictionary of attributes for the specified URI, with the keys of
* type @ref OFFileAttributeKey
*/
- (OFFileAttributes)attributesOfItemAtURI: (OFURI *)URI;
/**
* @brief Sets the attributes for the item at the specified URI.
*
* All attributes not part of the dictionary are left unchanged.
*
* @param attributes The attributes to set for the specified URI
* @param URI The URI of the item to set the attributes for
*/
- (void)setAttributes: (OFFileAttributes)attributes ofItemAtURI: (OFURI *)URI;
/**
* @brief Checks whether a file exists at the specified URI.
*
* @param URI The URI to check
* @return A boolean whether there is a file at the specified URI
*/
- (bool)fileExistsAtURI: (OFURI *)URI;
/**
* @brief Checks whether a directory exists at the specified URI.
*
* @param URI The URI to check
* @return A boolean whether there is a directory at the specified URI
*/
- (bool)directoryExistsAtURI: (OFURI *)URI;
/**
* @brief Creates a directory at the specified URI.
*
* @param URI The URI of the directory to create
*/
- (void)createDirectoryAtURI: (OFURI *)URI;
/**
* @brief Returns an array with the URIs of the items in the specified
* directory.
*
* @note `.` and `..` are not part of the returned array.
*
* @param URI The URI to the directory whose items should be returned
* @return An array with the URIs of the items in the specified directory
*/
- (OFArray OF_GENERIC(OFURI *) *)contentsOfDirectoryAtURI: (OFURI *)URI;
/**
* @brief Removes the item at the specified URI.
*
* If the item at the specified URI is a directory, it is removed recursively.
*
* @param URI The URI to the item which should be removed
*/
- (void)removeItemAtURI: (OFURI *)URI;
/**
* @brief Creates a hard link for the specified item.
*
* The destination URI must have a full path, which means it must include the
* name of the item.
*
* This method is not available for all URIs.
*
* @param source The URI to the item for which a link should be created
* @param destination The URI to the item which should link to the source
*/
- (void)linkItemAtURI: (OFURI *)source toURI: (OFURI *)destination;
/**
* @brief Creates a symbolic link for an item.
*
* The destination URI must have a full path, which means it must include the
* name of the item.
*
* This method is not available for all URIs.
*
* @note On Windows, this requires at least Windows Vista and administrator
* privileges!
*
* @param URI The URI to the item which should symbolically link to the target
* @param target The target of the symbolic link
*/
- (void)createSymbolicLinkAtURI: (OFURI *)URI
withDestinationPath: (OFString *)target;
/**
* @brief Tries to efficiently copy an item. If a copy would only be possible
* by reading the entire item and then writing it, it returns false.
*
* The destination URI must have a full path, which means it must include the
* name of the item.
*
* If an item already exists, the copy operation fails. This is also the case
* if a directory is copied and an item already exists in the destination
* directory.
*
* @param source The file, directory or symbolic link to copy
* @param destination The destination URI
* @return True if an efficient copy was performed, false if an efficient copy
* was not possible. Note that errors while performing a copy are
* reported via exceptions and not by returning false!
*/
- (bool)copyItemAtURI: (OFURI *)source toURI: (OFURI *)destination;
/**
* @brief Tries to efficiently move an item. If a move would only be possible
* by copying the source and deleting it, it returns false.
*
* The destination URI must have a full path, which means it must include the
* name of the item.
*
* If the destination is on a different logical device or uses a different
* scheme, an efficient move is not possible and false is returned.
*
* @param source The item to rename
* @param destination The new name for the item
* @return True if an efficient move was performed, false if an efficient move
* was not possible. Note that errors while performing a move are
* reported via exceptions and not by returning false!
*/
- (bool)moveItemAtURI: (OFURI *)source toURI: (OFURI *)destination;
@end
OF_ASSUME_NONNULL_END