OSID - osid.subscription.SubscriptionPublisherAssignmentSession Service Interface Definition

Interface	osid.subscription.SubscriptionPublisherAssignmentSession
Implements	`osid.OsidSession`
Description	This session provides methods to re-assign `Subscriptions` to `Publishers.` A `Subscription` may map to multiple `Publishers` and removing the last reference to a `Subscription` is the equivalent of deleting it. Each `Publisher` may have its own authorizations governing who is allowed to operate on it. Adding a reference of a `Subscription` to another `Publisher` is not a copy operation (eg: does not change its `Id` ).
Method	canAssignSubscriptions
Description	Tests if this user can alter subscription/publisher 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	canAssignSubscriptionsToPublisher
Description	Tests if this user can alter subscription/publisher 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`	`publisherId`	the `Id` of the `Publisher`
Return	`boolean`		`false` if mapping is not authorized, `true` otherwise
Errors	NULL_ARGUMENT		`publisherId` is `null`
Compliance	`mandatory`		This method must be implemented.
Method	getAssignablePublisherIds
Description	Gets a list of publishers including and under the given publisher node in which any subscription can be assigned.
Parameters	`osid.id.Id`	`publisherId`	the `Id` of the `Publisher`
Return	`osid.id.IdList`		list of assignable publisher `Ids`
Errors	NULL_ARGUMENT		`publisherId` is `null`
Errors	OPERATION_FAILED		unable to complete request
Compliance	`mandatory`		This method must be implemented.
Method	getAssignablePublisherIdsForSubscription
Description	Gets a list of publishers including and under the given publisher node in which a specific subscription can be assigned.
Parameters	`osid.id.Id`	`publisherId`	the `Id` of the `Publisher`
Parameters	`osid.id.Id`	`subscriptionId`	the `Id` of the `Subscription`
Return	`osid.id.IdList`		list of assignable publisher `Ids`
Errors	NULL_ARGUMENT		`publisherId` or `subscriptionId` is `null`
Errors	OPERATION_FAILED		unable to complete request
Compliance	`mandatory`		This method must be implemented.
Method	assignSubscriptionToPublisher
Description	Adds an existing `Subscription` to a `Publisher.`
Parameters	`osid.id.Id`	`subscriptionId`	the `Id` of the `Subscription`
Parameters	`osid.id.Id`	`publisherId`	the `Id` of the `Publisher`
Errors	ALREADY_EXISTS		`subscriptionId` is already assigned to `publisherId`
	NOT_FOUND		`subscriptionId` or `publisherId` not found
	NULL_ARGUMENT		`subscriptionId` or `publisherId` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.
Method	unassignSubscriptionFromPublisher
Description	Removes a `Subscription` from a `Publisher.`
Parameters	`osid.id.Id`	`subscriptionId`	the `Id` of the `Subscription`
Parameters	`osid.id.Id`	`publisherId`	the `Id` of the `Publisher`
Errors	NOT_FOUND		`subscriptionId` or `publisherId` not found or `subscriptionId` not assigned to `publisherId`
	NULL_ARGUMENT		`subscriptionId` or `publisherId` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.
Method	reassignSubscriptionToPublisher
Description	Moves a `Subscription` from one `Publisher` to another. Mappings to other `Publishers` are unaffected.
Parameters	`osid.id.Id`	`subscriptionId`	the `Id` of the `Subscription`
	`osid.id.Id`	`fromPublisherId`	the `Id` of the current `Publisher`
	`osid.id.Id`	`toPublisherId`	the `Id` of the destination `Publisher`
Errors	NOT_FOUND		`subscriptionId, fromPublisherId,` or `toPublisherId` not found or `subscriptionId` not mapped to `fromPublisherId`
	NULL_ARGUMENT		`subscriptionId, fromPublisherId,` or `toPublisherId` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.