/**
* Compute which element should be quizzed next from the given set of elements UID, according to
* the statistics of each elements.
*
* @param elementsUID Set of elementsUID from which to found the next element.
* @return String Element Unique ID
*/
public String getNextElement(Vector<String> elementsUID) {
String currentElementUID = null;
float bestScore = Float.NEGATIVE_INFINITY;
float currentScore = bestScore;
Vector<String> bestsUIDs = new Vector<String>();
Iterator<String> itElements = elementsUID.iterator();
while (itElements.hasNext()) {
currentElementUID = itElements.next();
if (!statistics.containsKey(currentElementUID)) {
KanjiNoSensei.log(
Level.WARNING,
Messages.getString("LearningProfile.LearningProfile.WarningNeverSeenElement")
+ " : \""
+ currentElementUID
+ "\""); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
return currentElementUID;
}
currentScore = statistics.get(currentElementUID).getNeedScore();
if (currentScore > bestScore) {
bestsUIDs.removeAllElements();
bestsUIDs.add(currentElementUID);
bestScore = currentScore;
} else if (currentScore == bestScore) {
bestsUIDs.add(currentElementUID);
}
}
return bestsUIDs.get(random.nextInt(bestsUIDs.size()));
}
/**
* Loads a learning profile from File, throws IOException on ClassNotFound.
*
* @param file Learning profile file to open.
* @throws IOException on any Input/Output error.
*/
public static LearningProfile open(File file) throws IOException {
KanjiNoSensei.log(
Level.INFO,
Messages.getString("LearningProfile.OpeningFile")
+ " : \""
+ file.getAbsolutePath()
+ "\""); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
LearningProfile learningProfile = null;
// Open file stream
ObjectInputStream ois = null;
try {
ois =
new RefactoredClassNameTolerantObjectInputStream(
new FileInputStream(file), RefactoringInfos.REFACTORED_PACKAGES);
Object obj = ois.readObject();
if (!LearningProfile.class.isInstance(obj)) throw new ClassNotFoundException();
learningProfile = (LearningProfile) obj;
learningProfile.pack();
} catch (ClassNotFoundException e) {
KanjiNoSensei.log(
Level.SEVERE,
Messages.getString("LearningProfile.Open.ErrorOnElement")
+ " : "
+ e.getMessage()); // $NON-NLS-1$ //$NON-NLS-2$
throw new IOException(
Messages.getString("LearningProfile.Open.ErrorOnElement") + " : " + e.getMessage(),
e); //$NON-NLS-1$ //$NON-NLS-2$)
} finally {
try {
if (ois != null) ois.close();
} catch (Exception e) {
// Nothing.
}
}
return learningProfile;
}
/**
* Add elements with empty statistics. If an element from neverSeenElements is already known and
* has statistics, a SEVERE error is logged, but no exception is thrown.
*
* @param neverSeenElements Set of elements UID of never seen elements.
*/
public void addNeverSeenElements(Vector<String> neverSeenElements) {
Iterator<String> itElements = neverSeenElements.iterator();
String elementUID;
while (itElements.hasNext()) {
elementUID = itElements.next();
if (statistics.containsKey(elementUID)) {
KanjiNoSensei.log(
Level.SEVERE,
Messages.getString(
"LearningProfile.LearningProfile.ErrorAlreadyKnownElement")); //$NON-NLS-1$
} else {
statistics.put(elementUID, new Statistics());
}
}
}