OFIRIHandler Class Reference

A handler for an IRI scheme. More...

#include <ObjFW/ObjFW.h>

Inheritance diagram for OFIRIHandler:

Instance Methods
(instancetype)	- initWithScheme:
	Initializes the handler for the specified scheme.
(OFStream *)	- openItemAtIRI:mode:
	Opens the item at the specified IRI.
(OFFileAttributes)	- attributesOfItemAtIRI:
	Returns the attributes for the item at the specified IRI.
(void)	- setAttributes:ofItemAtIRI:
	Sets the attributes for the item at the specified IRI.
(bool)	- fileExistsAtIRI:
	Checks whether a file exists at the specified IRI.
(bool)	- directoryExistsAtIRI:
	Checks whether a directory exists at the specified IRI.
(void)	- createDirectoryAtIRI:
	Creates a directory at the specified IRI.
(OFArray *)	- contentsOfDirectoryAtIRI:
	Returns an array with the IRIs of the items in the specified directory.
(void)	- removeItemAtIRI:
	Removes the item at the specified IRI.
(void)	- linkItemAtIRI:toIRI:
	Creates a hard link for the specified item.
(void)	- createSymbolicLinkAtIRI:withDestinationPath:
	Creates a symbolic link for an item.
(bool)	- copyItemAtIRI:toIRI:
	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.
(bool)	- moveItemAtIRI:toIRI:
	Tries to efficiently move an item. If a move would only be possible by copying the source and deleting it, it returns false.
(OFData *)	- extendedAttributeDataForName:ofItemAtIRI:
	Returns the extended attribute data for the specified name of the item at the specified IRI.
(void)	- getExtendedAttributeData:andType:forName:ofItemAtIRI:
	Gets the extended attribute data and type for the specified name of the item at the specified IRI.
(void)	- setExtendedAttributeData:forName:ofItemAtIRI:
	Sets the extended attribute data for the specified name of the item at the specified IRI.
(void)	- setExtendedAttributeData:andType:forName:ofItemAtIRI:
	Sets the extended attribute data and type for the specified name of the item at the specified IRI.
(void)	- removeExtendedAttributeForName:ofItemAtIRI:
	Removes the extended attribute for the specified name of the item at the specified IRI.
Instance Methods inherited from OFObject
(instancetype)	- init
	Initializes an already allocated object.
(nullable OFMethodSignature *)	- methodSignatureForSelector:
	Returns the method signature for the specified selector.
(void)	- dealloc
	Deallocates the object.
(void)	- performSelector:afterDelay:
	Performs the specified selector after the specified delay.
(void)	- performSelector:withObject:afterDelay:
	Performs the specified selector with the specified object after the specified delay.
(void)	- performSelector:withObject:withObject:afterDelay:
	Performs the specified selector with the specified objects after the specified delay.
(void)	- performSelector:withObject:withObject:withObject:afterDelay:
	Performs the specified selector with the specified objects after the specified delay.
(void)	- performSelector:withObject:withObject:withObject:withObject:afterDelay:
	Performs the specified selector with the specified objects after the specified delay.
(void)	- performSelector:onThread:waitUntilDone:
	Performs the specified selector on the specified thread.
(void)	- performSelector:onThread:withObject:waitUntilDone:
	Performs the specified selector on the specified thread with the specified object.
(void)	- performSelector:onThread:withObject:withObject:waitUntilDone:
	Performs the specified selector on the specified thread with the specified objects.
(void)	- performSelector:onThread:withObject:withObject:withObject:waitUntilDone:
	Performs the specified selector on the specified thread with the specified objects.
(void)	- performSelector:onThread:withObject:withObject:withObject:withObject:waitUntilDone:
	Performs the specified selector on the specified thread with the specified objects.
(void)	- performSelectorOnMainThread:waitUntilDone:
	Performs the specified selector on the main thread.
(void)	- performSelectorOnMainThread:withObject:waitUntilDone:
	Performs the specified selector on the main thread with the specified object.
(void)	- performSelectorOnMainThread:withObject:withObject:waitUntilDone:
	Performs the specified selector on the main thread with the specified objects.
(void)	- performSelectorOnMainThread:withObject:withObject:withObject:waitUntilDone:
	Performs the specified selector on the main thread with the specified objects.
(void)	- performSelectorOnMainThread:withObject:withObject:withObject:withObject:waitUntilDone:
	Performs the specified selector on the main thread with the specified objects.
(void)	- performSelector:onThread:afterDelay:
	Performs the specified selector on the specified thread after the specified delay.
(void)	- performSelector:onThread:withObject:afterDelay:
	Performs the specified selector on the specified thread with the specified object after the specified delay.
(void)	- performSelector:onThread:withObject:withObject:afterDelay:
	Performs the specified selector on the specified thread with the specified objects after the specified delay.
(void)	- performSelector:onThread:withObject:withObject:withObject:afterDelay:
	Performs the specified selector on the specified thread with the specified objects after the specified delay.
(void)	- performSelector:onThread:withObject:withObject:withObject:withObject:afterDelay:
	Performs the specified selector on the specified thread with the specified objects after the specified delay.
(nullable id)	- forwardingTargetForSelector:
	This method is called when resolveClassMethod: or resolveInstanceMethod: returned false. It should return a target to which the message should be forwarded.
(void)	- doesNotRecognizeSelector:
	Handles messages which are not understood by the receiver.
Instance Methods inherited from <OFObject>
(unsigned long)	- hash
	Returns a hash for the object.
(unsigned int)	- retainCount
	Returns the retain count.
(bool)	- isProxy
	Returns whether the object is a proxy object.
(bool)	- isKindOfClass:
	Returns a boolean whether the object is of the specified kind.
(bool)	- isMemberOfClass:
	Returns a boolean whether the object is a member of the specified class.
(bool)	- respondsToSelector:
	Returns a boolean whether the object responds to the specified selector.
(nullable IMP)	- methodForSelector:
	Returns the implementation for the specified selector.
(nullable id)	- performSelector:
	Performs the specified selector.
(nullable id)	- performSelector:withObject:
	Performs the specified selector with the specified object.
(nullable id)	- performSelector:withObject:withObject:
	Performs the specified selector with the specified objects.
(nullable id)	- performSelector:withObject:withObject:withObject:
	Performs the specified selector with the specified objects.
(nullable id)	- performSelector:withObject:withObject:withObject:withObject:
	Performs the specified selector with the specified objects.
(bool)	- isEqual:
	Checks two objects for equality.
(instancetype)	- retain
	Increases the retain count.
(void)	- release
	Decreases the retain count.
(instancetype)	- autorelease
	Adds the object to the topmost autorelease pool of the thread's autorelease pool stack.
(instancetype)	- self
	Returns the receiver.
(bool)	- allowsWeakReference
	Returns whether the object allows a weak reference.
(bool)	- retainWeakReference
	Retain a weak reference to this object.

Class Methods
(bool)	+ registerClass:forScheme:
	Registers the specified class as the handler for the specified scheme.
(OFIRIHandler *)	+ handlerForIRI:
	Returns the handler for the specified IRI.
(OFStream *)	+ openItemAtIRI:mode:
	Opens the item at the specified IRI.
Class Methods inherited from OFObject
(void)	+ load
	A method which is called once when the class is loaded into the runtime.
(void)	+ unload
	A method which is called when the class is unloaded from the runtime.
(void)	+ initialize
	A method which is called the moment before the first call to the class is being made.
(instancetype)	+ alloc
	Allocates memory for an instance of the class and sets up the memory pool for the object.
(Class)	+ class
	Returns the class.
(OFString *)	+ className
	Returns the name of the class as a string.
(bool)	+ isSubclassOfClass:
	Returns a boolean whether the class is a subclass of the specified class.
(nullable Class)	+ superclass
	Returns the superclass of the class.
(bool)	+ instancesRespondToSelector:
	Checks whether instances of the class respond to a given selector.
(bool)	+ conformsToProtocol:
	Checks whether the class conforms to a given protocol.
(nullable IMP)	+ instanceMethodForSelector:
	Returns the implementation of the instance method for the specified selector.
(nullable OFMethodSignature *)	+ instanceMethodSignatureForSelector:
	Returns the method signature of the instance method for the specified selector.
(OFString *)	+ description
	Returns a description for the class, which is usually the class name.
(nullable IMP)	+ replaceClassMethod:withMethodFromClass:
	Replaces a class method with a class method from another class.
(nullable IMP)	+ replaceInstanceMethod:withMethodFromClass:
	Replaces an instance method with an instance method from another class.
(void)	+ inheritMethodsFromClass:
	Adds all methods from the specified class to the class that is the receiver.
(bool)	+ resolveClassMethod:
	Try to resolve the specified class method.
(bool)	+ resolveInstanceMethod:
	Try to resolve the specified instance method.
(id)	+ copy
	Returns the class.

Properties
OFString *	scheme
	The scheme this OFIRIHandler handles.
Properties inherited from OFObject
OFString *	className
	The name of the object's class.
OFString *	description
	A description for the object.

Detailed Description

A handler for an IRI scheme.

Method Documentation

attributesOfItemAtIRI:

- (OFFileAttributes) attributesOfItemAtIRI:

(OFIRI *)

IRI

Returns the attributes for the item at the specified IRI.

Parameters

IRI	The IRI to return the attributes for

Returns

A dictionary of attributes for the specified IRI, with the keys of type OFFileAttributeKey

Exceptions

OFGetItemAttributesFailedException	Failed to get the attributes of the item
OFUnsupportedProtocolException	The handler cannot handle the IRI's scheme

contentsOfDirectoryAtIRI:

- (OFArray *) contentsOfDirectoryAtIRI:

(OFIRI *)

IRI

Returns an array with the IRIs of the items in the specified directory.

Note

. and .. are not part of the returned array.

Parameters

IRI	The IRI to the directory whose items should be returned

Returns

An array with the IRIs of the items in the specified directory

Exceptions

OFOpenItemFailedException	Opening the directory failed
OFReadFailedException	Reading from the directory failed
OFUnsupportedProtocolException	The handler cannot handle the IRI's scheme

copyItemAtIRI:toIRI:

- (bool) copyItemAtIRI:		(OFIRI *)	source
toIRI:		(OFIRI *)	destination

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.

Parameters

source	The file, directory or symbolic link to copy
destination	The destination IRI

Returns

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!

Exceptions

OFCopyItemFailedException	Copying failed
OFUnsupportedProtocolException	The handler cannot handle the IRI's scheme

createDirectoryAtIRI:

- (void) createDirectoryAtIRI:

(OFIRI *)

IRI

Creates a directory at the specified IRI.

Parameters

IRI	The IRI of the directory to create

Exceptions

OFCreateDirectoryFailedException	Creating the directory failed
OFUnsupportedProtocolException	The handler cannot handle the IRI's scheme

createSymbolicLinkAtIRI:withDestinationPath:

- (void) createSymbolicLinkAtIRI:		(OFIRI *)	IRI
withDestinationPath:		(OFString *)	target

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!

Parameters

IRI	The IRI to the item which should symbolically link to the target
target	The target of the symbolic link

Exceptions

OFCreateSymbolicLinkFailed	Creating a symbolic link failed
OFUnsupportedProtocolException	The handler cannot handle the IRI's scheme

directoryExistsAtIRI:

- (bool) directoryExistsAtIRI:

(OFIRI *)

IRI

Checks whether a directory exists at the specified IRI.

Parameters

IRI	The IRI to check

Returns

A boolean whether there is a directory at the specified IRI

Exceptions

OFUnsupportedProtocolException

The handler cannot handle the IRI's scheme

extendedAttributeDataForName:ofItemAtIRI:

- (OFData *) extendedAttributeDataForName:		(OFString *)	name
ofItemAtIRI:		(OFIRI *)	IRI

Returns the extended attribute data for the specified name of the item at the specified IRI.

Deprecated

Use getExtendedAttributeData:andType:forName:ofItemAtIRI: instead.

This method is not available for all IRIs.

Parameters

name	The name of the extended attribute
IRI	The IRI of the item to return the extended attribute from

Returns

The extended attribute data for the specified name of the item at the specified IRI

Exceptions

OFGetItemAttributesFailedException	Getting the extended attribute failed
OFUnsupportedProtocolException	The handler cannot handle the IRI's scheme
OFNotImplementedException	Getting extended attributes is not implemented for the specified item

fileExistsAtIRI:

- (bool) fileExistsAtIRI:

(OFIRI *)

IRI

Checks whether a file exists at the specified IRI.

Parameters

IRI	The IRI to check

Returns

A boolean whether there is a file at the specified IRI

Exceptions

OFUnsupportedProtocolException

The handler cannot handle the IRI's scheme

getExtendedAttributeData:andType:forName:ofItemAtIRI:

- (void) getExtendedAttributeData:		(OFData * *)	data
andType:		(id *)	type
forName:		(OFString *)	name
ofItemAtIRI:		(OFIRI *)	IRI

Gets the extended attribute data and type for the specified name of the item at the specified IRI.

This method is not available for all IRIs.

Parameters

data	A pointer to OFData * that gets set to the data of the extended attribute
type	A pointer to id that gets set to the type of the extended attribute, if not NULL. Gets set to nil if the extended attribute has no type. The type of the type depends on the IRI handler.
name	The name of the extended attribute
IRI	The IRI of the item to return the extended attribute from

Exceptions

OFGetItemAttributesFailedException	Getting the extended attribute failed
OFUnsupportedProtocolException	The handler cannot handle the IRI's scheme
OFNotImplementedException	Getting extended attributes is not implemented for the specified item

handlerForIRI:

+ (OFIRIHandler *) handlerForIRI:

(OFIRI *)

IRI

Returns the handler for the specified IRI.

Returns

The handler for the specified IRI.

Exceptions

OFUnsupportedProtocolException

The specified IRI is not supported

initWithScheme:

- (instancetype) initWithScheme:

(OFString *)

scheme

Initializes the handler for the specified scheme.

Parameters

scheme

The scheme to initialize for

Returns

An initialized IRI handler

linkItemAtIRI:toIRI:

- (void) linkItemAtIRI:		(OFIRI *)	source
toIRI:		(OFIRI *)	destination

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.

Parameters

source	The IRI to the item for which a link should be created
destination	The IRI to the item which should link to the source

Exceptions

OFLinkItemFailedException	Linking the item failed
OFUnsupportedProtocolException	The handler cannot handle the scheme of one of the IRIs
OFNotImplementedException	Hardlinks are not implemented for the specified IRI

moveItemAtIRI:toIRI:

- (bool) moveItemAtIRI:		(OFIRI *)	source
toIRI:		(OFIRI *)	destination

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.

Parameters

source	The item to rename
destination	The new name for the item

Returns

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!

Exceptions

OFMoveItemFailedException	Moving failed
OFUnsupportedProtocolException	The handler cannot handle the IRI's scheme

openItemAtIRI:mode: [1/2]

+ (OFStream *) openItemAtIRI:		(OFIRI *)	IRI
mode:		(OFString *)	mode

Opens the item at the specified IRI.

Parameters

IRI

The IRI of the item which should be opened

mode

The mode in which the file should be opened. Possible modes are: 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 The handler is allowed to not implement all modes and is also allowed to implement additional, scheme-specific modes.

Returns

The opened stream if it was successfully opened

Exceptions

OFOpenItemFailedException	Opening the item failed
OFUnsupportedProtocolException	The specified IRI is not supported

openItemAtIRI:mode: [2/2]

- (OFStream *) openItemAtIRI:		(OFIRI *)	IRI
mode:		(OFString *)	mode

Opens the item at the specified IRI.

Parameters

IRI

The IRI of the item which should be opened

mode

The mode in which the file should be opened. Possible modes are: 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 The handler is allowed to not implement all modes and is also allowed to implement additional, scheme-specific modes.

Returns

The opened stream if it was successfully opened

Exceptions

OFOpenItemFailedException	Opening the item failed
OFUnsupportedProtocolException	The specified IRI is not supported by the handler

registerClass:forScheme:

+ (bool) registerClass:		(Class)	class_
forScheme:		(OFString *)	scheme

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.

Parameters

class_	The class to register as the handler for the specified scheme
scheme	The scheme for which to register the handler

Returns

Whether the class was successfully registered. If a handler for the same scheme is already registered, registration fails.

removeExtendedAttributeForName:ofItemAtIRI:

- (void) removeExtendedAttributeForName:		(OFString *)	name
ofItemAtIRI:		(OFIRI *)	IRI

Removes the extended attribute for the specified name of the item at the specified IRI.

This method is not available for all IRIs.

Parameters

name	The name of the extended attribute to remove
IRI	The IRI of the item to remove the extended attribute from

Exceptions

OFSetItemAttributesFailedException	Removing the extended attribute failed
OFUnsupportedProtocolException	The handler cannot handle the IRI's scheme
OFNotImplementedException	Removing extended attributes is not implemented for the specified item

removeItemAtIRI:

- (void) removeItemAtIRI:

(OFIRI *)

IRI

Removes the item at the specified IRI.

If the item at the specified IRI is a directory, it is removed recursively.

Parameters

IRI	The IRI to the item which should be removed

Exceptions

OFRemoveItemFailedException	Removing the item failed
OFUnsupportedProtocolException	The handler cannot handle the IRI's scheme

setAttributes:ofItemAtIRI:

- (void) setAttributes:		(OFFileAttributes)	attributes
ofItemAtIRI:		(OFIRI *)	IRI

Sets the attributes for the item at the specified IRI.

All attributes not part of the dictionary are left unchanged.

Parameters

attributes	The attributes to set for the specified IRI
IRI	The IRI of the item to set the attributes for @throw OFSetItemAttributesFailedException Failed to set the attributes of the item

Exceptions

OFUnsupportedProtocolException	The handler cannot handle the IRI's scheme
OFNotImplementedException	Setting one or more of the specified attributes is not implemented for the specified item

setExtendedAttributeData:andType:forName:ofItemAtIRI:

- (void) setExtendedAttributeData:		(OFData *)	data
andType:		(nullable id)	type
forName:		(OFString *)	name
ofItemAtIRI:		(OFIRI *)	IRI

Sets the extended attribute data and type for the specified name of the item at the specified IRI.

This method is not available for all IRIs. Not all IRIs support a non-nil type.

Parameters

data	The data for the extended attribute
type	The type for the extended attribute. nil does not mean to keep the existing type, but to set it to no type. The type of the type depends on the IRI handler.
name	The name of the extended attribute
IRI	The IRI of the item to set the extended attribute on

Exceptions

OFSetItemAttributesFailedException	Setting the extended attribute failed
OFUnsupportedProtocolException	The handler cannot handle the IRI's scheme
OFNotImplementedException	Setting extended attributes is not implemented for the specified item or a type was specified and typed extended attributes are not supported

setExtendedAttributeData:forName:ofItemAtIRI:

- (void) setExtendedAttributeData:		(OFData *)	data
forName:		(OFString *)	name
ofItemAtIRI:		(OFIRI *)	IRI

Sets the extended attribute data for the specified name of the item at the specified IRI.

Deprecated

Use setExtendedAttributeData:andType:forName:ofItemAtIRI: instead.

This method is not available for all IRIs.

Parameters

data	The data for the extended attribute
name	The name of the extended attribute
IRI	The IRI of the item to set the extended attribute on

Exceptions

OFSetItemAttributesFailedException	Setting the extended attribute failed
OFUnsupportedProtocolException	The handler cannot handle the IRI's scheme
OFNotImplementedException	Setting extended attributes is not implemented for the specified item

---

The documentation for this class was generated from the following files:

• src/OFIRIHandler.h
• src/OFIRIHandler.m