OSID - osid.control.DeviceSystemAssignmentSession Service Interface Definition

Interface	osid.control.DeviceSystemAssignmentSession
Implements	`osid.OsidSession`
Description	This session provides methods to re-assign `Devices` to `System` mappings. A `Device` may appear in multiple `System` objects and removing the last reference to a `Device` is the equivalent of deleting it. Each `System` may have its own authorizations governing who is allowed to operate on it. Adding a reference of a `Device` to another `System` is not a copy operation (eg: does not change its `Id` ).
Method	canAssignDevices
Description	Tests if this user can alter device/system 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 control is not authorized, `true` otherwise
Compliance	`mandatory`		This method must be implemented.
Method	canAssignDevicesToSystem
Description	Tests if this user can alter device/system 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.
Parameters	`osid.id.Id`	`systemId`	the `Id` of the `System`
Return	`boolean`		`false` if control is not authorized, `true` otherwise
Errors	NULL_ARGUMENT		`systemId` is `null`
Compliance	`mandatory`		This method must be implemented.
Method	getAssignableSystemIds
Description	Gets a list of systems including and under the given system node in which any device can be assigned.
Parameters	`osid.id.Id`	`systemId`	the `Id` of the `System`
Return	`osid.id.IdList`		list of assignable system `Ids`
Errors	NULL_ARGUMENT		`systemId` is `null`
Errors	OPERATION_FAILED		unable to complete request
Compliance	`mandatory`		This method must be implemented.
Method	getAssignableSystemIdsForDevice
Description	Gets a list of systems including and under the given system node in which a specific device can be assigned.
Parameters	`osid.id.Id`	`systemId`	the `Id` of the `System`
Parameters	`osid.id.Id`	`deviceId`	the `Id` of the `Device`
Return	`osid.id.IdList`		list of assignable system `Ids`
Errors	NULL_ARGUMENT		`systemId` or `deviceId` is `null`
Errors	OPERATION_FAILED		unable to complete request
Compliance	`mandatory`		This method must be implemented.
Method	assignDeviceToSystem
Description	Adds an existing `Device` to a `System.`
Parameters	`osid.id.Id`	`deviceId`	the `Id` of the `Device`
Parameters	`osid.id.Id`	`systemId`	the `Id` of the `System`
Errors	ALREADY_EXISTS		`deviceId` is slready assigned to `systemId`
	NOT_FOUND		`deviceId` or `systemId` not found
	NULL_ARGUMENT		`deviceId` or `systemId` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.
Method	unassignDeviceFromSystem
Description	Removes a `Device` from a `System.`
Parameters	`osid.id.Id`	`deviceId`	the `Id` of the `Device`
Parameters	`osid.id.Id`	`systemId`	the `Id` of the `System`
Errors	NOT_FOUND		`deviceId` or `systemId` not found or `deviceId` not assigned to `systemId`
	NULL_ARGUMENT		`deviceId` or `systemId` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.
Method	reassignDeviceToSystem
Description	Moves a `Device` from one `System` to another. Mappings to other `Systems` are unaffected.
Parameters	`osid.id.Id`	`deviceId`	the `Id` of the `Device`
	`osid.id.Id`	`fromSystemId`	the `Id` of the current `System`
	`osid.id.Id`	`toSystemId`	the `Id` of the destination `System`
Errors	NOT_FOUND		`deviceId, fromSystemId,` or `toSystemId` not found or `deviceId` not mapped to `fromSystemId`
	NULL_ARGUMENT		`deviceId, fromSystemId,` or `toSystemId` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.