OSID - osid.messaging.MessageMailboxAssignmentSession Service Interface Definition

Interface	osid.messaging.MessageMailboxAssignmentSession
Implements	`osid.OsidSession`
Description	This session provides methods to re-assign `Messages` to `Mailboxes.` A `Message` may map to multiple `Mailbox` objects and removing the last reference to a `Message` is the equivalent of deleting it. Each `Mailbox` may have its own authorizations governing who is allowed to operate on it. Moving or adding a reference of a `Message` to another `Mailbox` is not a copy operation (eg: does not change its `Id` ).
Method	canAssignMessages
Description	Tests if this user can alter message/mailbox 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	canAssignMessagesToMailbox
Description	Tests if this user can alter message/mailbox 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`	`mailboxId`	the `Id` of the `Mailbox`
Return	`boolean`		`false` if messaging is not authorized, `true` otherwise
Errors	NULL_ARGUMENT		`mailboxId` is `null`
Compliance	`mandatory`		This method must be implemented.
Method	getAssignableMailboxIds
Description	Gets a list of mailboxes including and under the given mailbox node in which any message can be assigned.
Parameters	`osid.id.Id`	`mailboxId`	the `Id` of the `Mailbox`
Return	`osid.id.IdList`		list of assignable mailbox `Ids`
Errors	NULL_ARGUMENT		`mailboxId` is `null`
Errors	OPERATION_FAILED		unable to complete request
Compliance	`mandatory`		This method must be implemented.
Method	getAssignableMailboxIdsForMessage
Description	Gets a list of mailboxes including and under the given mailbox node in which a specific message can be assigned.
Parameters	`osid.id.Id`	`mailboxId`	the `Id` of the `Mailbox`
Parameters	`osid.id.Id`	`messageId`	the `Id` of the `Message`
Return	`osid.id.IdList`		list of assignable mailbox `Ids`
Errors	NULL_ARGUMENT		`mailboxId` or `messageId` is `null`
Errors	OPERATION_FAILED		unable to complete request
Compliance	`mandatory`		This method must be implemented.
Method	assignMessageToMailbox
Description	Adds an existing `Message` to a `Mailbox.`
Parameters	`osid.id.Id`	`messageId`	the `Id` of the `Message`
Parameters	`osid.id.Id`	`mailboxId`	the `Id` of the `Mailbox`
Errors	ALREADY_EXISTS		`messageId` is already assigned to `mailboxId`
	NOT_FOUND		`messageId` or `mailboxId` not found
	NULL_ARGUMENT		`messageId` or `mailboxId` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.
Method	unassignMessageFromMailbox
Description	Removes a `Message` from a `Mailbox.`
Parameters	`osid.id.Id`	`messageId`	the `Id` of the `Message`
Parameters	`osid.id.Id`	`mailboxId`	the `Id` of the `Mailbox`
Errors	NOT_FOUND		`messageId` or `mailboxId` or `messageId` not assigned to `mailboxId`
	NULL_ARGUMENT		`messageId` or `mailboxId` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.