OSID - osid.topology.EdgeGraphAssignmentSession Service Interface Definition

Interface	osid.topology.EdgeGraphAssignmentSession
Implements	`osid.OsidSession`
Description	This session provides methods to re-assign `Edges` to `Graph` objects An `Edge` may appear in multiple `Graph` objects and removing the last reference to an `Edge` is the equivalent of deleting it. Each `Graph` may have its own authorizations governing who is allowed to operate on it. Adding a reference of an `Edge` to another `Graph` is not a copy operation (eg: does not change its `Id` ).
Method	canAssignEdges
Description	Tests if this user can alter edge/graph 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	canAssignEdgesToGraph
Description	Tests if this user can alter edge/graph 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`	`graphId`	the `Id` of the `Graph`
Return	`boolean`		`false` if mapping is not authorized, `true` otherwise
Errors	NULL_ARGUMENT		`graphId` is `null`
Compliance	`mandatory`		This method must be implemented.
Method	getAssignableGraphIds
Description	Gets a list of graphs including and under the given graph node in which any edge can be assigned.
Parameters	`osid.id.Id`	`graphId`	the `Id` of the `Graph`
Return	`osid.id.IdList`		list of assignable graph `Ids`
Errors	NULL_ARGUMENT		`graphId` is `null`
Errors	OPERATION_FAILED		unable to complete request
Compliance	`mandatory`		This method must be implemented.
Method	getAssignableGraphIdsForEdge
Description	Gets a list of graphs including and under the given graph node in which a specific edge can be assigned.
Parameters	`osid.id.Id`	`graphId`	the `Id` of the `Graph`
Parameters	`osid.id.Id`	`edgeId`	the `Id` of the `Edge`
Return	`osid.id.IdList`		list of assignable graph `Ids`
Errors	NULL_ARGUMENT		`graphId` or `edgeId` is `null`
Errors	OPERATION_FAILED		unable to complete request
Compliance	`mandatory`		This method must be implemented.
Method	assignEdgeToGraph
Description	Adds an existing `Edge` to a `Graph.`
Parameters	`osid.id.Id`	`edgeId`	the `Id` of the `Edge`
Parameters	`osid.id.Id`	`graphId`	the `Id` of the `Graph`
Errors	ALREADY_EXISTS		`edgeId` is already assigned to `graphId`
	NOT_FOUND		`edgeId` or `graphId` not found
	NULL_ARGUMENT		`edgeId` or `graphId` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.
Method	unassignEdgeFromGraph
Description	Removes an `Edge` from a `Graph.`
Parameters	`osid.id.Id`	`edgeId`	the `Id` of the `Edge`
Parameters	`osid.id.Id`	`graphId`	the `Id` of the `Graph`
Errors	NOT_FOUND		`edgeId` or `graphId` not found or `edgeId` not assigned to `graphId`
	NULL_ARGUMENT		`edgeId` or `graphId` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.
Method	reassignEdgeToGraph
Description	Moves an `Edge` from one `Graph` to another. Mappings to other `Graphs` are unaffected.
Parameters	`osid.id.Id`	`edgeId`	the `Id` of the `Edge`
	`osid.id.Id`	`fromGraphId`	the `Id` of the current `Graph`
	`osid.id.Id`	`toGraphId`	the `Id` of the destination `Graph`
Errors	NOT_FOUND		`edgeId, fromGraphId,` or `toGraphId` not found or `edgeId` not mapped to `fromGraphId`
	NULL_ARGUMENT		`edgeId, fromGraphId,` or `toGraphId` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.