org.activemath.studentmodel2
Class SatelliteHelper

java.lang.Object
  org.activemath.studentmodel2.SatelliteHelper

public class SatelliteHelper
extends Object

This class automatically extracts and caches relations between Satellite Items and concepts/other satellites. Relations are extracted on demand and then cached, similarly as in the PropagationHelper class. TODO: add listener process to invalidate cached objects upon changes in the content

Field Summary

protected static Category

log

Method Summary

List<String>	getFors(String satelliteId) Get a cyclic-free version of fors for the satellite
static SatelliteHelper	getInstance() Get an instance of the SatelliteHelper
int	getSatelliteMastery(String itemId, AssessmentModel assessmentModel) Get the mastery for a specific satellite (it is calculated by averaging all existing contributing masteries)
Map<String,Integer>	getSatelliteMasteryComponents(String itemId, AssessmentModel assessmentModel) Get all concepts with their masteries, which contribute to the given satellite mastery

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

log

protected static Category log

Method Detail

getInstance

public static SatelliteHelper getInstance()

Get an instance of the SatelliteHelper

Returns:

The instance

getFors

public List<String> getFors(String satelliteId)

Get a cyclic-free version of fors for the satellite

Parameters:

satelliteId - - the satellite

Returns:

a List of direct fors

getSatelliteMastery

public int getSatelliteMastery(String itemId,
                               AssessmentModel assessmentModel)

Get the mastery for a specific satellite (it is calculated by averaging all existing contributing masteries)

Parameters:

itemId - - ID of the satellite

assessmentModel - - The assessmentModel of a user

Returns:

The satellite mastery

getSatelliteMasteryComponents

public Map<String,Integer> getSatelliteMasteryComponents(String itemId,
                                                         AssessmentModel assessmentModel)

Get all concepts with their masteries, which contribute to the given satellite mastery

Parameters:

itemId - - the satelliteId

assessmentModel - - the assessment model of the respective user to calculate the masteries for

Returns:

A Map where the key is a concept and the value is the mastery