OSID - osid.voting.BallotPollsAssignmentSession Service Interface Definition

Interface	osid.voting.BallotPollsAssignmentSession
Implements	`osid.OsidSession`
Description	This session provides methods to re-assign `Ballots` to `Polls.` A `Ballot` may map to multiple `Polls` objects and removing the last reference to a `Ballot` is the equivalent of deleting it. Each `Polls` may have its own authorizations governing who is allowed to operate on it. Moving or adding a reference of a `Ballot` to another `Polls` is not a copy operation (eg: does not change its `Id` ).
Method	canAssignBallots
Description	Tests if this user can alter ballot/polls 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	canAssignBallotsToPolls
Description	Tests if this user can alter ballot/polls 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`	`pollsId`	the `Id` of the `Polls`
Return	`boolean`		`false` if mapping is not authorized, `true` otherwise
Errors	NULL_ARGUMENT		`pollsId` is `null`
Compliance	`mandatory`		This method must be implemented.
Method	getAssignablePollsIds
Description	Gets a list of polls including and under the given polls node in which any ballot can be assigned.
Parameters	`osid.id.Id`	`pollsId`	the `Id` of the `Polls`
Return	`osid.id.IdList`		list of assignable polls `Ids`
Errors	NULL_ARGUMENT		`pollsId` is `null`
Errors	OPERATION_FAILED		unable to complete request
Compliance	`mandatory`		This method must be implemented.
Method	getAssignablePollsIdsForBallot
Description	Gets a list of polls including and under the given polls node in which a specific ballot can be assigned.
Parameters	`osid.id.Id`	`pollsId`	the `Id` of the `Polls`
Parameters	`osid.id.Id`	`ballotId`	the `Id` of the `Ballot`
Return	`osid.id.IdList`		list of assignable polls `Ids`
Errors	NULL_ARGUMENT		`pollsId` or `ballotId` is `null`
Errors	OPERATION_FAILED		unable to complete request
Compliance	`mandatory`		This method must be implemented.
Method	assignBallotToPolls
Description	Adds an existing `Ballot` to a `Polls.`
Parameters	`osid.id.Id`	`ballotId`	the `Id` of the `Ballot`
Parameters	`osid.id.Id`	`pollsId`	the `Id` of the `Polls`
Errors	ALREADY_EXISTS		`ballotId` is already assigned to `pollsId`
	NOT_FOUND		`ballotId` or `pollsId` not found
	NULL_ARGUMENT		`ballotId` or `pollsId` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.
Method	unassignBallotFromPolls
Description	Removes a `Ballot` from a `Polls.`
Parameters	`osid.id.Id`	`ballotId`	the `Id` of the `Ballot`
Parameters	`osid.id.Id`	`pollsId`	the `Id` of the `Polls`
Errors	NOT_FOUND		`ballotId` or `pollsId` not found or `ballotId` not assigned to `pollsId`
	NULL_ARGUMENT		`ballotId` or `pollsId` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.