/**
* Evaluates this expression and all its children.
*
* @param depth of this expression in expression tree (root's depth = 0)
* @return result of evaluation
* @see #evaluate(ProcessingContext)
*/
protected Value evaluate(final ProcessingContext context, final int depth) {
Value result;
final boolean thisIsValid = context.isSubjectValid() || isThisExpressionValid(context);
if (thisIsValid) {
/* Expression is valid, so evaluate it */
result = evaluateValidSelfAndChildren(context, depth);
} else {
/* Expression is not valid, so register a warning and return NULL */
context.fireRuntimeWarning(
this, "Expression is not valid and will not be evaluated. Returning NULL instead");
result = NullValue.INSTANCE;
}
/* Log result of evaluation. */
if (logger.isTraceEnabled() || logger.isDebugEnabled()) {
final String format = "{}{} -> {}({})";
final Object[] arguments =
new Object[] {
formatIndent(depth), getClass().getSimpleName(), result.getBaseType(), result
};
if (!(getParent() instanceof Expression)) {
logger.debug(format, arguments);
} else {
logger.trace(format, arguments);
}
}
return result;
}
/** Returns true if any subexpression is NULL; false otherwise. */
protected static boolean isAnyChildNull(final Value[] childValues) {
for (final Value childValue : childValues) {
if (childValue.isNull()) {
return true;
}
}
return false;
}
@Override
public boolean evaluate(final ItemProcessingContext context) throws TemplateProcessingInterrupt {
final Value value = getExpression().evaluate(context);
if (value.isNull() || !((BooleanValue) value).booleanValue()) {
return false;
}
super.evaluate(context);
return true;
}
@Override
public boolean validateResponse(
final ItemSessionController itemSessionController, final Value responseValue) {
/* Extract response values */
final Set<Identifier> responseHottextIdentifiers = new HashSet<Identifier>();
if (responseValue.isNull()) {
/* (Empty response) */
} else if (responseValue.getCardinality().isList()) {
/* (Container response) */
for (final SingleValue value : (ListValue) responseValue) {
responseHottextIdentifiers.add(((IdentifierValue) value).identifierValue());
}
} else {
/* (Single response) */
responseHottextIdentifiers.add(((IdentifierValue) responseValue).identifierValue());
}
/* Check the number of responses */
final int minChoices = getMinChoices();
final int maxChoices = getMaxChoices();
if (responseHottextIdentifiers.size() < minChoices) {
return false;
}
if (maxChoices != 0 && responseHottextIdentifiers.size() > maxChoices) {
return false;
}
/* Make sure each choice is a valid identifier */
final Set<Identifier> hottextIdentifiers = new HashSet<Identifier>();
final List<Hottext> hottexts = QueryUtils.search(Hottext.class, this);
for (final Hottext hottext : hottexts) {
hottextIdentifiers.add(hottext.getIdentifier());
}
for (final Identifier responseHottextIdentifier : responseHottextIdentifiers) {
if (!hottextIdentifiers.contains(responseHottextIdentifier)) {
return false;
}
}
return true;
}
@Override
public boolean validateResponse(
final ItemSessionController itemSessionController, final Value responseValue) {
/* Extract response values */
final Set<Identifier> responseChoiceIdentifiers = new HashSet<Identifier>();
if (responseValue.isNull()) {
/* (Empty response) */
} else if (responseValue.getCardinality().isList()) {
/* (Container response) */
for (final SingleValue hotspotChoiceIdentifier : (ListValue) responseValue) {
responseChoiceIdentifiers.add(
((IdentifierValue) hotspotChoiceIdentifier).identifierValue());
}
} else {
/* (Single response - this won't actually happen) */
responseChoiceIdentifiers.add(((IdentifierValue) responseValue).identifierValue());
}
/* Chheck min/max (if set) */
final Integer maxChoices = getMaxChoices();
final Integer minChoices = getMinChoices();
if (maxChoices != null && minChoices != null) {
if (responseChoiceIdentifiers.size() < minChoices.intValue()
|| responseChoiceIdentifiers.size() > maxChoices.intValue()) {
return false;
}
}
/* Check that each identifier is valid */
final Set<Identifier> choiceIdentifiers = new HashSet<Identifier>();
for (final HotspotChoice choice : getHotspotChoices()) {
choiceIdentifiers.add(choice.getIdentifier());
}
for (final Identifier choiceIdentifier : responseChoiceIdentifiers) {
if (!choiceIdentifiers.contains(choiceIdentifier)) {
return false;
}
}
return true;
}
private String stringifyQtiValue(final Value value) {
if (qtiWorksDeploymentSettings.isEnableMathAssessExtension()
&& GlueValueBinder.isMathsContentRecord(value)) {
/* This is a special MathAssess "Maths Content" variable. In this case, we'll record
* just the ASCIIMath input form or the Maxima form, if either are available.
*/
final RecordValue mathsValue = (RecordValue) value;
final SingleValue asciiMathInput =
mathsValue.get(MathAssessConstants.FIELD_CANDIDATE_INPUT_IDENTIFIER);
if (asciiMathInput != null) {
return "ASCIIMath[" + asciiMathInput.toQtiString() + "]";
}
final SingleValue maximaForm = mathsValue.get(MathAssessConstants.FIELD_MAXIMA_IDENTIFIER);
if (maximaForm != null) {
return "Maxima[" + maximaForm.toQtiString() + "]";
}
}
/* Just convert to QTI string in the usual way */
return value.toQtiString();
}