OSID - osid.control.SystemHierarchyDesignSession Service Interface Definition

Interface	osid.control.SystemHierarchyDesignSession
Implements	`osid.OsidSession`
Used By	`osid.control.ControlManager`
Used By	`osid.control.ControlProxyManager`
Description	This session defines methods for managing a hierarchy of `Systems`. Each node in the hierarchy is a unique `System`.
Method	getSystemHierarchyId
Description	Gets the hierarchy `Id` associated with this session.
Return	`osid.id.Id`		the hierarchy `Id` associated with this session
Compliance	`mandatory`		This method must be implemented.
Method	getSystemHierarchy
Description	Gets the hierarchy associated with this session.
Return	`osid.hierarchy.Hierarchy`		the hierarchy associated with this session
Errors	OPERATION_FAILED		unable to complete request
Errors	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.
Method	canModifySystemHierarchy
Description	Tests if this user can change the hierarchy. A return of true does not guarantee successful authorization. A return of false indicates that it is known performing any update will result in a `PERMISSION_DENIED`. This is intended as a hint to an application that may opt not to offer these operations to an unauthorized user.
Return	`boolean`		`false` if changing this hierarchy is not authorized, `true` otherwise
Compliance	`mandatory`		This method must be implemented.
Method	addRootSystem
Description	Adds a root system.
Parameters	`osid.id.Id`	`systemId`	the `Id` of a system
Errors	ALREADY_EXISTS		`systemId` is already in hierarchy
	NOT_FOUND		`systemId` not found
	NULL_ARGUMENT		`systemId` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.
Method	removeRootSystem
Description	Removes a root system.
Parameters	`osid.id.Id`	`systemId`	the `Id` of a system
Errors	NOT_FOUND		`systemId` is not a root
	NULL_ARGUMENT		`systemId` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.
Method	addChildSystem
Description	Adds a child to a system.
Parameters	`osid.id.Id`	`systemId`	the `Id` of a system
Parameters	`osid.id.Id`	`childId`	the `Id` of the new child
Errors	ALREADY_EXISTS		`systemId` is already a parent of `childId`
	NOT_FOUND		`systemId` or `childId` not found
	NULL_ARGUMENT		`systemId` or `childId` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.
Method	removeChildSystem
Description	Removes a child from a system.
Parameters	`osid.id.Id`	`systemId`	the `Id` of a system
Parameters	`osid.id.Id`	`childId`	the `Id` of the new child
Errors	NOT_FOUND		`systemId` is not parent of `childId`
	NULL_ARGUMENT		`systemId` or `childId` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.
Method	removeChildSystems
Description	Removes all children from a system.
Parameters	`osid.id.Id`	`systemId`	the `Id` of a system
Errors	NOT_FOUND		`systemId` is not found
	NULL_ARGUMENT		`systemId` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.