OSID - osid.grading.calculation.GradebookColumnCalculation Service Interface Definition

Interface	osid.grading.calculation.GradebookColumnCalculation
Implements	`osid.OsidRule`
Description	A `GradebookColumnCalculation` represents a rule to derive a column baed on one or more other columns.
Method	getGradebookColumnId
Description	Gets the `GradebookColumn Ids` to which this column applies.
Return	`osid.id.Id`		the gradebook column `Id`
Compliance	`mandatory`		This method must be implemented.
Method	getGradebookColumn
Description	Gets the `GradebookColumn` to which this calculation applies.
Return	`osid.grading.GradebookColumn`		the gradebook column
Errors	OPERATION_FAILED		unable to complete request
Compliance	`mandatory`		This method must be implemented.
Method	getInputGradebookColumnIds
Description	Gets the `GradebookColumn Ids` from which this column is derived.
Return	`osid.id.IdList`		the derived column `Ids`
Compliance	`mandatory`		This method must be implemented.
Method	getInputGradebookColumns
Description	Gets the `GradebookColumns` from which this column is derived.
Return	`osid.grading.GradebookColumnList`		the derived columns
Errors	OPERATION_FAILED		unable to complete request
Compliance	`mandatory`		This method must be implemented.
Method	getOperation
Description	Gets the operation to perform for deriving this column. The output of the operation determines the score or grade for the column entries.
Return	`osid.grading.calculation.CalculationOperation`		the calculation operation
Compliance	`mandatory`		This method must be implemented.
Method	getTweakedCenter
Description	Gets the tweaked midpoint input value of the grading system for determining how to center calculated enries in this column. This tweak is applied before calculating standard deviation offsets for entries in this derived column.
Return	`decimal`		the tweaked center
Errors	ILLEGAL_STATE		`getCalculation()` is not `CalculationOperation.STD_DEVIATION_OFFSET`
Compliance	`mandatory`		This method must be implemented.
Method	getTweakedStandardDeviation
Description	Gets the tweaked standard deviation. This tweak is applied before calculating standard deviation offsets for entries in this derived column.
Return	`decimal`		the tweaked standard deviation
Errors	ILLEGAL_STATE		`getCalculation()` is not `CalculationOperation.STD_DEVIATION_OFFSET`
Compliance	`mandatory`		This method must be implemented.
Method	getGradebookColumnCalculationRecord
Description	Gets the gradebook column calculation record corresponding to the given `GradeBookColumnCalculation` record `Type.` This method is used to retrieve an object implementing the requested record. The `gradebookColumnCalculationRecordType` may be the `Type` returned in `getRecordTypes()` or any of its parents in a `Type` hierarchy where `hasRecordType(gradebookColumnCalculationRecordType)` is `true` .
Parameters	`osid.type.Type`	`gradebookColumnCalculationRecordType`	the type of the record to retrieve
Return	`osid.grading.calculation.records.GradebookColumnCalculationRecord`		the gradebook column calculation record
Errors	NULL_ARGUMENT		`gradebookColumnCalculationRecordType` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure occurred
	UNSUPPORTED		`hasRecordType(gradebookColumnCalculationRecordType)` is `false`
Compliance	`mandatory`		This method must be implemented.