/**
* setElement
* @param int $i
* @param Erfurt_Sparql_Query2_IF_TriplesSameSubject $element
* @return Erfurt_Sparql_Query2_ConstructTemplate $this
*/
public function setElement($i, $element)
{
if (!is_int($i)) {
throw new RuntimeException('Argument 1 passed to Erfurt_Sparql_Query2_GroupOrUnionGraphPattern::setElement must be an instance of integer, instance of ' . typeHelper($i) . ' given');
}
if (!$element instanceof Erfurt_Sparql_Query2_IF_TriplesSameSubject) {
throw new RuntimeException('Argument 1 passed to Erfurt_Sparql_Query2_GroupOrUnionGraphPattern::addElement must be an instance of Erfurt_Sparql_Query2_IF_TriplesSameSubject');
}
$this->elements[$i] = $element;
$element->addParent($this);
return $this;
//for chaining
}
/**
* order by a property (must be set as shown property before)
*
* @param type $uri the property to order by
* @param boolean $asc true if ascending, false if descending
*/
public function setOrderProperty($uri, $asc = true)
{
$this->setOffset(0);
if ($this->_sortTriple == null) {
$orderVar = new Erfurt_Sparql_Query2_Var('order');
$this->_sortTriple = new Erfurt_Sparql_Query2_OptionalGraphPattern(array(new Erfurt_Sparql_Query2_Triple($this->getResourceVar(), new Erfurt_Sparql_Query2_IriRef($uri), $orderVar)));
$this->_resourceQuery->getWhere()->addElement($this->_sortTriple);
$this->_resourceQuery->getOrder()->add($orderVar, $asc ? Erfurt_Sparql_Query2_OrderClause::ASC : Erfurt_Sparql_Query2_OrderClause::DESC);
} else {
$this->_sortTriple->getElement(0)->setP(new Erfurt_Sparql_Query2_IriRef($uri));
if ($asc) {
$this->_resourceQuery->getOrder()->setAsc(0);
} else {
$this->_resourceQuery->getOrder()->setDesc(0);
}
}
$this->invalidate();
}
