OSID - osid.metering.UtilityHierarchyDesignSession Service Interface Definition

Interface	osid.metering.UtilityHierarchyDesignSession
Implements	`osid.OsidSession`
Description	This session manages a hierarchy of utilities. Utilities may be organized into a hierarchy for organizing or federating. A parent `Utility` includes all of the Ids of its children such that a single root node contains all of the `Ids` of the federation.
Method	getUtilityHierarchyId
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	getUtilityHierarchy
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	canModifyUtilityHierarchy
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	addRootUtility
Description	Adds a root utility.
Parameters	`osid.id.Id`	`utilityId`	the `Id` of a utility
Errors	ALREADY_EXISTS		`utilityId` is already in hierarchy
	NOT_FOUND		`utilityId` not found
	NULL_ARGUMENT		`utilityId` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.
Method	removeRootUtility
Description	Removes a root utility.
Parameters	`osid.id.Id`	`utilityId`	the `Id` of a utility
Errors	NOT_FOUND		`utilityId` is not a root
	NULL_ARGUMENT		`utilityId` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.
Method	addChildUtility
Description	Adds a child to a utility.
Parameters	`osid.id.Id`	`utilityId`	the `Id` of a utility
Parameters	`osid.id.Id`	`childId`	the `Id` of the new child
Errors	ALREADY_EXISTS		`utilityId` is already a parent of `childId`
	NOT_FOUND		`utilityId` or `childId` not found
	NULL_ARGUMENT		`utilityId` or `childId` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.
Method	removeChildUtility
Description	Removes a child from a utility.
Parameters	`osid.id.Id`	`utilityId`	the `Id` of a utility
Parameters	`osid.id.Id`	`childId`	the `Id` of the new child
Errors	NOT_FOUND		`utilityId` not a parent of `childId`
	NULL_ARGUMENT		`utilityId` or `childId` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.
Method	removeChildUtilities
Description	Removes all children from a utility.
Parameters	`osid.id.Id`	`utilityId`	the `Id` of a utility
Errors	NOT_FOUND		`utilityId` not found
	NULL_ARGUMENT		`utilityId` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.