OSID - osid.control.SystemQuerySession Service Interface Definition

Interface	osid.control.SystemQuerySession
Implements	`osid.OsidSession`
Implemented By	`osid.control.SystemSearchSession`
Used By	`osid.control.ControlManager`
Used By	`osid.control.ControlProxyManager`
Description	This session provides methods for searching among `Systems`. The search query is constructed using the `SystemQuery`. Systems may have a query record indicated by their respective record types. The query record is accessed via the `SystemQuery`.
Method	canSearchSystems
Description	Tests if this user can perform `System` searches. A return of true does not guarantee successful authorization. A return of false indicates that it is known all methods in this session will result in a `PERMISSION_DENIED`. This is intended as a hint to an application that may not offer lookup operations to unauthorized users.
Return	`boolean`		`false` if search methods are not authorized, `true` otherwise
Compliance	`mandatory`		This method must be implemented.
Method	getSystemQuery
Description	Gets a system query.
Return	`osid.control.SystemQuery`		the system query
Compliance	`mandatory`		This method must be implemented.
Method	getSystemsByQuery
Description	Gets a list of `Systems` matching the given system query.
Parameters	`osid.control.SystemQuery`	`systemQuery`	the system query
Return	`osid.control.SystemList`		the returned `SystemList`
Errors	NULL_ARGUMENT		`systemQuery` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
	UNSUPPORTED		`systemQuery` is not of this service
Compliance	`mandatory`		This method must be implemented.