/**
* Adds a set of elements as long no duplicates are found
*
* @param CollectionInterface $collection
* @return boolean
*/
public function addAll(CollectionInterface $collection = NULL)
{
$iterator = $collection->getIterator();
foreach ($iterator as $element) {
if ($this->contains($element)) {
throw new \InvalidArgumentException('Duplicate element are not allowed');
}
}
return parent::addAll($collection);
}
/**
*
* @param CollectionInterface $collection
* @return boolean
*/
public function containsAll(CollectionInterface $collection)
{
$iterator = $collection->getIterator();
foreach ($iterator as $element) {
if (!$this->contains($element)) {
return false;
}
}
return true;
}
