OSID - osid.filing.FileLookupSession Service Interface Definition

Interface	osid.filing.FileLookupSession
Implements	`osid.OsidSession`
Description	This session defines methods for looking up on files in the current directory. This session defines the following views: comparative view: elements may be silently omitted or re-ordered plenary view: provides a complete result set or is an error condition federated directory view: searches include entries in directories of which this directory is an ancestor isolated directory view: lookups are restricted to entries in this directory only Generally, the comparative view should be used for most applications as it permits operation even if there is data out of sync. Some administrative applications may need to know whether it had retrieved an entire set of objects and may sacrifice some interoperability for the sake of precision using the plenary view.
Method	getDirectoryId
Description	Gets the `Id` of this directory.
Return	`osid.id.Id`		the `Id` of this directory
Compliance	`mandatory`		This method must be implemented.
Method	getDirectory
Description	Gets the directory associated with this session.
Return	`osid.filing.Directory`		the directory associated with this session
Errors	OPERATION_FAILED		unable to complete request
Errors	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.
Method	canLookupFiles
Description	Tests if this user can perform entry lookups. A return of true does not guarantee successful authorization. A return of false indicates that it is known all methods in this session will result in a `PERMISSION_DENIED.` This is intended as a hint to an application that may opt not to offer lookup operations.
Return	`boolean`		`false` if lookup methods are not authorized, `true` otherwise
Compliance	`mandatory`		This method must be implemented.
Method	useComparativeFileView
Description	The returns from the lookup methods may omit or translate elements based on this session, such as authorization, and not result in an error. This view is used when greater interoperability is desired at the expense of precision.
Compliance	`mandatory`		This method is must be implemented.
Method	usePlenaryFileView
Description	A complete view of the file returns is desired. Methods will return what is requested or result in an error. This view is used when greater precision is desired at the expense of interoperability.
Compliance	`mandatory`		This method is must be implemented.
Method	useFederatedDirectoryView
Description	Federates the view for methods in this session. A federated view will include entries in directories which are children of this directory.
Compliance	`mandatory`		This method is must be implemented.
Method	useIsolatedDirectoryView
Description	Isolates the view for methods in this session. An isolated view restricts lookups to this directory only.
Compliance	`mandatory`		This method is must be implemented.
Method	getFile
Description	Gets a specified file or alias to the file.
Parameters	`osid.id.Id`	`fileId`	the `Id` to the file
Return	`osid.filing.File`		the file
Errors	NOT_FOUND		`fileId` is not found
	NULL_ARGUMENT		`fileId` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.
Method	getFilesByIds
Description	Gets a `FileList` corresponding to the given `IdList.` In plenary mode, the returned list contains all of the files specified in the `Id` list, in the order of the list, including duplicates, or an error results if an `Id` in the supplied list is not found or inaccessible. Otherwise, inaccessible `Fies` may be omitted from the list and may present the elements in any order including returning a unique set.
Parameters	`osid.id.IdList`	`fileIds`	the list of `Ids` to retrieve
Return	`osid.filing.FileList`		the returned `File` list
Errors	NOT_FOUND		an `Id` was not found
	NULL_ARGUMENT		`fileIds` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.
Method	getFilesByGenusType
Description	Gets a `FileList` corresponding to the given file genus `Type` which does not include files of genus types derived from the specified `Type.` In plenary mode, the returned list contains all known files or an error results. Otherwise, the returned list may contain only those files that are accessible through this session.
Parameters	`osid.type.Type`	`fileGenusType`	a file genus type
Return	`osid.filing.FileList`		the returned `File list`
Errors	NULL_ARGUMENT		`fileGenusType` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.
Method	getFilesByParentGenusType
Description	Gets a `FileList` corresponding to the given file genus `Type` and include any additional files with genus types derived from the specified `Type.` In plenary mode, the returned list contains all known files or an error results. Otherwise, the returned list may contain only those files that are accessible through this session.
Parameters	`osid.type.Type`	`fileGenusType`	a file genus type
Return	`osid.filing.FileList`		the returned `File` list
Errors	NULL_ARGUMENT		`fileGenusType` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.
Method	getFilesByRecordType
Description	Gets a `FileList` corresponding to the given file record `Type.` The set of files implementing the given record type is returned. In plenary mode, the returned list contains all known files or an error results. Otherwise, the returned list may contain only those files that are accessible through this session.
Parameters	`osid.type.Type`	`fileRecordType`	a file record type
Return	`osid.filing.FileList`		the returned `File` list
Errors	NULL_ARGUMENT		`fileRecordType` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.
Method	getFiles
Description	Gets the list of files and aliases to files in this directory. In a federated view, this method returns all files in descendant directories. In plenary mode, the returned list contains all known files or an error results. Otherwise, the returned list may contain only those files that are accessible through this session.
Return	`osid.filing.FileList`		the list of files in this directory
Errors	OPERATION_FAILED		unable to complete request
Errors	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.