/**
* Read and fill the Variable $variable with its value contained
* in the current stream.
*
* @param Variable $variable A QTI Runtime Variable object.
* @throws BinaryStreamAccessException If an error occurs at the binary level.
*/
public function readVariableValue(Variable $variable)
{
try {
$isNull = $this->readBoolean();
if ($isNull === true) {
// Nothing more to be read.
$variable->setValue(null);
return;
}
$count = $this->readBoolean() === true ? 1 : $this->readShort();
$cardinality = $variable->getCardinality();
$baseType = $variable->getBaseType();
if ($cardinality === Cardinality::RECORD) {
// Deal with records.
$values = new RecordContainer();
for ($i = 0; $i < $count; $i++) {
$isNull = $this->readBoolean();
$val = $this->readRecordField($isNull);
$values[$val[0]] = $val[1];
}
$variable->setValue($values);
} else {
$toCall = 'read' . ucfirst(BaseType::getNameByConstant($baseType));
if ($cardinality === Cardinality::SINGLE) {
// Deal with a single value.
$variable->setValue(Utils::valueToRuntime(call_user_func(array($this, $toCall)), $baseType));
} else {
// Deal with multiple values.
$values = $cardinality === Cardinality::MULTIPLE ? new MultipleContainer($baseType) : new OrderedContainer($baseType);
for ($i = 0; $i < $count; $i++) {
$isNull = $this->readBoolean();
$values[] = $isNull === true ? null : Utils::valueToRuntime(call_user_func(array($this, $toCall)), $baseType);
}
$variable->setValue($values);
}
}
} catch (BinaryStreamAccessException $e) {
$msg = "An error occured while reading a Variable value.";
throw new QtiBinaryStreamAccessException($msg, $this, QtiBinaryStreamAccessException::VARIABLE, $e);
} catch (InvalidArgumentException $e) {
$msg = "Datatype mismatch for variable '{$varId}'.";
throw new QtiBinaryStreamAccessException($msg, $this, QtiBinaryStreamAccessException::VARIABLE, $e);
}
}