OSID - osid.checklist.TodoChecklistSession Service Interface Definition

Interface	osid.checklist.TodoChecklistSession
Implements	`osid.OsidSession`
Description	This session provides methods to retrieve `Todo` to `Checklist` mappings. A `Todo` may appear in multiple `Checklists.` Each `Checklist` may have its own authorizations governing who is allowed to look at it. This lookup session defines several views: comparative view: elements may be silently omitted or re-ordered plenary view: provides a complete result set or is an error condition
Method	canLookupTodoChecklistMappings
Description	Tests if this user can perform lookups of todo/checklist mappings. A return of true does not guarantee successful authorization. A return of false indicates that it is known lookup methods in this session will result in a `PERMISSION_DENIED.` This is intendedas a hint to an application that may opt not to offer lookup operations to unauthorized users.
Return	`boolean`		`false` if looking up mappings is not authorized, `true` otherwise
Compliance	`mandatory`		This method must be implemented.
Method	useComparativeChecklistView
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	usePlenaryChecklistView
Description	A complete view of the `Todo` and `Checklist` 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	getTodoIdsByChecklist
Description	Gets the list of Todo Ids associated with a `Checklist.`
Parameters	`osid.id.Id`	`checklistId`	`Id` of a `Checklist.`
Return	`osid.id.IdList`		list of related todo `Ids`
Errors	NOT_FOUND		`checklistId` is not found
	NULL_ARGUMENT		`checklistId` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.
Method	getTodosByChecklist
Description	Gets the list of `Todos` associated with a `Checklist.`
Parameters	`osid.id.Id`	`checklistId`	`Id` of a `Checklist`
Return	`osid.checklist.TodoList`		list of related todos
Errors	NOT_FOUND		`checklistId` is not found
	NULL_ARGUMENT		`checklistId` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.
Method	getTodoIdsByChecklists
Description	Gets the list of `Todo Ids` corresponding to a list of `Checklist` objects.
Parameters	`osid.id.IdList`	`checklistIds`	list of checklist `Ids`
Return	`osid.id.IdList`		list of todo `Ids`
Errors	NULL_ARGUMENT		`checklistIds` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.
Method	getTodosByChecklists
Description	Gets the list of `Todos` corresponding to a list of `Checklists.`
Parameters	`osid.id.IdList`	`checklistIds`	list of checklist `Ids`
Return	`osid.checklist.TodoList`		list of todos
Errors	NULL_ARGUMENT		`checklistIds` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.
Method	getChecklistIdsByTodo
Description	Gets the list of `Checklist` `Ids` mapped to a `Todo.`
Parameters	`osid.id.Id`	`todoId`	`Id` of a `Todo`
Return	`osid.id.IdList`		list of checklist `Ids`
Errors	NOT_FOUND		`todoId` is not found
	NULL_ARGUMENT		`todoId` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.
Method	getChecklistsByTodo
Description	Gets the list of `Checklist` objects mapped to a `Todo.`
Parameters	`osid.id.Id`	`todoId`	`Id` of a `Todo`
Return	`osid.checklist.ChecklistList`		list of checklists
Errors	NOT_FOUND		`todoId` is not found
	NULL_ARGUMENT		`todoId` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.