OSID - osid.billing.ItemBusinessAssignmentSession Service Interface Definition

Interface	osid.billing.ItemBusinessAssignmentSession
Implements	`osid.OsidSession`
Used By	`osid.billing.BillingManager`
Used By	`osid.billing.BillingProxyManager`
Description	This session provides methods to re-assign `Items` to `Businesses` . An `Item` may appear in multiple `Businesses` and removing the last reference to an `Item` 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 an `Item` to another `Business` is not a copy operation (eg: does not change its `Id` ).
Method	canAssignItems
Description	Tests if this user can alter item/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	canAssignItemToBusiness
Description	Tests if this user can alter item/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 item 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	getAssignableBusinessIdsForItem
Description	Gets a list of businesses including and under the given business node in which a specific item can be assigned.
Parameters	`osid.id.Id`	`businessId`	the `Id` of the `Business`
Parameters	`osid.id.Id`	`itemId`	the `Id` of the `Item`
Return	`osid.id.IdList`		list of assignable business `Ids`
Errors	NULL_ARGUMENT		`businessId` or `itemId` is `null`
Errors	OPERATION_FAILED		unable to complete request
Compliance	`mandatory`		This method must be implemented.
Method	assignItemToBusiness
Description	Adds an existing `Item` to a `Business` .
Parameters	`osid.id.Id`	`itemId`	the `Id` of the `Item`
Parameters	`osid.id.Id`	`businessId`	the `Id` of the `Business`
Errors	ALREADY_EXISTS		`itemId` is already assigned to `businessId`
	NOT_FOUND		`itemId` or `businessId` not found
	NULL_ARGUMENT		`itemId` or `businessId` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.
Method	unassignItemFromBusiness
Description	Removes an `Item` from a `Business` .
Parameters	`osid.id.Id`	`itemId`	the `Id` of the `Item`
Parameters	`osid.id.Id`	`businessId`	the `Id` of the `Business`
Errors	NOT_FOUND		`itemId` or `businessId` not found or `itemId` not assigned to `businessId`
	NULL_ARGUMENT		`itemId` or `businessId` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.
Method	reassignItemToBusiness
Description	Moves an `Item` from one `Business` to another. Mappings to other `Businesses` are unaffected.
Parameters	`osid.id.Id`	`itemId`	the `Id` of the `Item`
	`osid.id.Id`	`fromBusinessId`	the `Id` of the current `Business`
	`osid.id.Id`	`toBusinessId`	the `Id` of the destination `Business`
Errors	ALREADY_EXISTS		`itemId` already assigned to `toBusinessId`
	NOT_FOUND		`itemId, fromBusinessId` , or `toBusinessId` not found or `itemId` not mapped to `fromBusinessId`
	NULL_ARGUMENT		`itemId, fromBusinessId` , or `toBusinessId` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.