/**
* @dataProvider longerThanOrEqualsProvider
*
* @param Duration $duration1
* @param Duration $duration2
* @param boolean $expected
*/
public function testLongerThanOrEquals(Duration $duration1, Duration $duration2, $expected)
{
$this->assertSame($expected, $duration1->longerThanOrEquals($duration2));
}
/**
* Subtract a duration to this one. If $duration is greather than or equal to
* the current duration, a duration of 0 seconds is returned.
*
* For instance P2S - P1S = P1S
*/
public function sub(Duration $duration)
{
if ($duration->longerThanOrEquals($this) === true) {
$this->setInterval(new DateInterval('PT0S'));
} else {
$refStrDate = '@0';
$tz = new DateTimeZone(self::TIMEZONE);
$d1 = new DateTime($refStrDate, $tz);
$d2 = new DateTime($refStrDate, $tz);
$d1->add(new DateInterval($this->__toString()));
$d2->add(new DateInterval($duration->__toString()));
$interval = $d1->diff($d2);
$this->setInterval($interval);
}
}
/**
* Write a Duration in the current binary stream.
*
* @param Duration $duration A Duration object.
* @throws QtiBinaryStreamAccessException
*/
public function writeDuration(Duration $duration)
{
try {
$this->writeString($duration->__toString());
} catch (BinaryStreamAccessException $e) {
$msg = "An error occured while writing a duration.";
throw new QtiBinaryStreamAccessException($msg, $this, QtiBinaryStreamAccessException::DURATION, $e);
}
}
/**
* Update the duration built-in variable. The update will only take
* place if the current state of the item session is INTERACTING.
*
*/
public function updateDuration()
{
// If the current state is INTERACTING update duration built-in variable.
if ($this->getState() === AssessmentItemSessionState::INTERACTING) {
$timeRef = $this->getTimeReference();
$now = new DateTime('now', new DateTimeZone('UTC'));
$data =& $this->getDataPlaceHolder();
$diff = $timeRef->diff($now);
$data['duration']->getValue()->add($diff);
$this->setTimeReference($now);
foreach ($this->onDurationUpdate as $callBack) {
call_user_func_array($callBack, array($this, Duration::createFromDateInterval($diff)));
}
}
}
/**
* Marshall a QTI duration datatype into its PCI JSON Representation.
*
* @param \qtism\common\datatypes\Duration $duration
* @return array
*/
protected function marshallDuration(Duration $duration)
{
return array('base' => array('duration' => $duration->__toString()));
}
