OSID - osid.billing.CategoryBusinessAssignmentSession Service Interface Definition

Interface	osid.billing.CategoryBusinessAssignmentSession
Implements	`osid.OsidSession`
Used By	`osid.billing.BillingManager`
Used By	`osid.billing.BillingProxyManager`
Description	This session provides methods to re-assign `Categories` to `Businesses`. A `Category` may appear in multiple `Businesses` and removing the last reference to a `Category` is the equivalent of deleting it. Each `Business` may have its own authorizations governing who is allowed to operate on it. Adding a reference of a `Category` to another `Business` is not a copy operation (eg: does not change its `Id`).
Method	canAssignCategories
Description	Tests if this user can alter category/business mappings. A return of true does not guarantee successful authorization. A return of false indicates that it is known mapping 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 assignment operations to unauthorized users.
Return	`boolean`		`false` if mapping is not authorized, `true` otherwise
Compliance	`mandatory`		This method must be implemented.
Method	canAssignCategoryToBusiness
Description	Tests if this user can alter category/business mappings. A return of true does not guarantee successful authorization. A return of false indicates that it is known mapping 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 to unauthorized users.
Parameters	`osid.id.Id`	`businessId`	the `Id` of the `Business`
Return	`boolean`		`false` if mapping is not authorized, `true` otherwise
Errors	NULL_ARGUMENT		`businessId` is `null`
Compliance	`mandatory`		This method must be implemented.
Method	getAssignableBusinessIds
Description	Gets a list of businesses including and under the given business node in which any category can be assigned.
Parameters	`osid.id.Id`	`businessId`	the `Id` of the `Business`
Return	`osid.id.IdList`		list of assignable business `Ids`
Errors	NULL_ARGUMENT		`businessId` is `null`
Errors	OPERATION_FAILED		unable to complete request
Compliance	`mandatory`		This method must be implemented.
Method	getAssignableBusinessIdsForCategory
Description	Gets a list of businesses including and under the given business node in which a specific category can be assigned.
Parameters	`osid.id.Id`	`businessId`	the `Id` of the `Business`
Parameters	`osid.id.Id`	`categoryId`	the `Id` of the `Category`
Return	`osid.id.IdList`		list of assignable business `Ids`
Errors	NULL_ARGUMENT		`businessId` or `categoryId` is `null`
Errors	OPERATION_FAILED		unable to complete request
Compliance	`mandatory`		This method must be implemented.
Method	assignCategoryToBusiness
Description	Adds an existing `Category` to a `Business`.
Parameters	`osid.id.Id`	`categoryId`	the `Id` of the `Category`
Parameters	`osid.id.Id`	`businessId`	the `Id` of the `Business`
Errors	ALREADY_EXISTS		`categoryId` is already assigned to `businessId`
	NOT_FOUND		`categoryId` or `businessId` not found
	NULL_ARGUMENT		`categoryId` or `businessId` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.
Method	unassignCategoryFromBusiness
Description	Removes a `Category` from a `Business`.
Parameters	`osid.id.Id`	`categoryId`	the `Id` of the `Category`
Parameters	`osid.id.Id`	`businessId`	the `Id` of the `Business`
Errors	NOT_FOUND		`categoryId` or `businessId` not found or `categoryId` not assigned to `businessId`
	NULL_ARGUMENT		`categoryId` or `businessId` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.
Method	reassignCategoryToBusiness
Description	Moves a `Category` from one `Business` to another. Mappings to other `Businesses` are unaffected.
Parameters	`osid.id.Id`	`categoryId`	the `Id` of the `Category`
	`osid.id.Id`	`fromBusinessId`	the `Id` of the current `Business`
	`osid.id.Id`	`toBusinessId`	the `Id` of the destination `Business`
Errors	ALREADY_EXISTS		`categoryId` already assigned to `toBusinessId`
	NOT_FOUND		`categoryId, fromBusinessId`, or `toBusinessId` not found or `categoryId` not mapped to `fromBusinessId`
	NULL_ARGUMENT		`categoryId, fromBusinessId`, or `toBusinessId` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.