/*
* Copyright (c) 2008-2023 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 OFData;
@class OFDate;
@class OFIRI;
@class OFStream;
/**
* @class OFIRIHandler OFIRIHandler.h ObjFW/OFIRIHandler.h
*
* @brief A handler for an IRI scheme.
*/
@interface OFIRIHandler: OFObject
{
OFString *_scheme;
OF_RESERVE_IVARS(OFIRIHandler, 4)
}
/**
* @brief The scheme this OFIRIHandler 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 IRI.
*
* @return The handler for the specified IRI.
* @throw OFUnsupportedProtocolException The specified IRI is not supported
*/
+ (OFIRIHandler *)handlerForIRI: (OFIRI *)IRI;
/**
* @brief Opens the item at the specified IRI.
*
* @param IRI The IRI 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
* @throw OFUnsupportedProtocolException The specified IRI is not supported
*/
+ (OFStream *)openItemAtIRI: (OFIRI *)IRI 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 IRI handler
*/
- (instancetype)initWithScheme: (OFString *)scheme OF_DESIGNATED_INITIALIZER;
/**
* @brief Opens the item at the specified IRI.
*
* @param IRI The IRI 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
* @throw OFUnsupportedProtocolException The specified IRI is not supported by
* the handler
*/
- (OFStream *)openItemAtIRI: (OFIRI *)IRI mode: (OFString *)mode;
/**
* @brief Returns the attributes for the item at the specified IRI.
*
* @param IRI The IRI to return the attributes for
* @return A dictionary of attributes for the specified IRI, with the keys of
* type @ref OFFileAttributeKey
* @throw OFGetItemAttributesFailedException Failed to get the attributes of
* the item
* @throw OFUnsupportedProtocolException The handler cannot handle the IRI's
* scheme
*/
- (OFFileAttributes)attributesOfItemAtIRI: (OFIRI *)IRI;
/**
* @brief Sets the attributes for the item at the specified IRI.
*
* All attributes not part of the dictionary are left unchanged.
*
* @param attributes The attributes to set for the specified IRI
* @param IRI The IRI of the item to set the attributes for
* @@throw OFSetItemAttributesFailedException Failed to set the attributes of
* the item
* @throw OFUnsupportedProtocolException The handler cannot handle the IRI's
* scheme
* @throw OFNotImplementedException Setting one or more of the specified
* attributes is not implemented for the
* specified item
*/
- (void)setAttributes: (OFFileAttributes)attributes ofItemAtIRI: (OFIRI *)IRI;
/**
* @brief Checks whether a file exists at the specified IRI.
*
* @param IRI The IRI to check
* @return A boolean whether there is a file at the specified IRI
* @throw OFUnsupportedProtocolException The handler cannot handle the IRI's
* scheme
*/
- (bool)fileExistsAtIRI: (OFIRI *)IRI;
/**
* @brief Checks whether a directory exists at the specified IRI.
*
* @param IRI The IRI to check
* @return A boolean whether there is a directory at the specified IRI
* @throw OFUnsupportedProtocolException The handler cannot handle the IRI's
* scheme
*/
- (bool)directoryExistsAtIRI: (OFIRI *)IRI;
/**
* @brief Creates a directory at the specified IRI.
*
* @param IRI The IRI of the directory to create
* @throw OFCreateDirectoryFailedException Creating the directory failed
* @throw OFUnsupportedProtocolException The handler cannot handle the IRI's
* scheme
*/
- (void)createDirectoryAtIRI: (OFIRI *)IRI;
/**
* @brief Returns an array with the IRIs of the items in the specified
* directory.
*
* @note `.` and `..` are not part of the returned array.
*
* @param IRI The IRI to the directory whose items should be returned
* @return An array with the IRIs of the items in the specified directory
* @throw OFOpenItemFailedException Opening the directory failed
* @throw OFReadFailedException Reading from the directory failed
* @throw OFUnsupportedProtocolException The handler cannot handle the IRI's
* scheme
*/
- (OFArray OF_GENERIC(OFIRI *) *)contentsOfDirectoryAtIRI: (OFIRI *)IRI;
/**
* @brief Removes the item at the specified IRI.
*
* If the item at the specified IRI is a directory, it is removed recursively.
*
* @param IRI The IRI to the item which should be removed
* @throw OFRemoveItemFailedException Removing the item failed
* @throw OFUnsupportedProtocolException The handler cannot handle the IRI's
* scheme
*/
- (void)removeItemAtIRI: (OFIRI *)IRI;
/**
* @brief Creates a hard link for the specified item.
*
* The destination IRI must have a full path, which means it must include the
* name of the item.
*
* This method is not available for all IRIs.
*
* @param source The IRI to the item for which a link should be created
* @param destination The IRI to the item which should link to the source
* @throw OFLinkItemFailedException Linking the item failed
* @throw OFUnsupportedProtocolException The handler cannot handle the scheme
* of one of the IRIs
* @throw OFNotImplementedException Hardlinks are not implemented for the
* specified IRI
*/
- (void)linkItemAtIRI: (OFIRI *)source toIRI: (OFIRI *)destination;
/**
* @brief Creates a symbolic link for an item.
*
* The destination IRI must have a full path, which means it must include the
* name of the item.
*
* This method is not available for all IRIs.
*
* @note On Windows, this requires at least Windows Vista and administrator
* privileges!
*
* @param IRI The IRI to the item which should symbolically link to the target
* @param target The target of the symbolic link
* @throw OFCreateSymbolicLinkFailed Creating a symbolic link failed
* @throw OFUnsupportedProtocolException The handler cannot handle the IRI's
* scheme
*/
- (void)createSymbolicLinkAtIRI: (OFIRI *)IRI
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 IRI 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 IRI
* @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!
* @throw OFCopyItemFailedException Copying failed
* @throw OFUnsupportedProtocolException The handler cannot handle the IRI's
* scheme
*/
- (bool)copyItemAtIRI: (OFIRI *)source toIRI: (OFIRI *)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 IRI 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!
* @throw OFMoveItemFailedException Moving failed
* @throw OFUnsupportedProtocolException The handler cannot handle the IRI's
* scheme
*/
- (bool)moveItemAtIRI: (OFIRI *)source toIRI: (OFIRI *)destination;
/**
* @brief Returns the extended attribute data for the specified name of the
* item at the specified IRI.
*
* This method is not available for all IRIs.
*
* @param name The name of the extended attribute
* @param IRI The IRI of the item to return the extended attribute from
* @throw OFGetItemAttributesFailedException Getting the extended attribute
* failed
* @throw OFUnsupportedProtocolException The handler cannot handle the IRI's
* scheme
* @throw OFNotImplementedException Getting extended attributes is not
* implemented for the specified item
*/
- (OFData *)extendedAttributeDataForName: (OFString *)name
ofItemAtIRI: (OFIRI *)IRI;
/**
* @brief Sets the extended attribute data for the specified name of the item
* at the specified IRI.
*
* This method is not available for all IRIs.
*
* @param data The data for the extended attribute
* @param name The name of the extended attribute
* @param IRI The IRI of the item to set the extended attribute on
* @throw OFSetItemAttributesFailedException Setting the extended attribute
* failed
* @throw OFUnsupportedProtocolException The handler cannot handle the IRI's
* scheme
* @throw OFNotImplementedException Setting extended attributes is not
* implemented for the specified item
*/
- (void)setExtendedAttributeData: (OFData *)data
forName: (OFString *)name
ofItemAtIRI: (OFIRI *)IRI;
/**
* @brief Removes the extended attribute for the specified name wof the item at
* the specified IRI.
*
* This method is not available for all IRIs.
*
* @param name The name of the extended attribute to remove
* @param IRI The IRI of the item to remove the extended attribute from
* @throw OFSetItemAttributesFailedException Removing the extended attribute
* failed
* @throw OFUnsupportedProtocolException The handler cannot handle the IRI's
* scheme
* @throw OFNotImplementedException Removing extended attributes is not
* implemented for the specified item
*/
- (void)removeExtendedAttributeForName: (OFString *)name
ofItemAtIRI: (OFIRI *)IRI;
@end
OF_ASSUME_NONNULL_END