/**
* {@inheritDoc}
*/
public function getCount(AdapterInterface $adapter, $page, $perPage)
{
$itemCount = $adapter->getItemCount();
$pageCount = (int) ceil($itemCount / $perPage);
if ($this->shouldMerge($itemCount, $perPage)) {
return $pageCount - 1;
}
return $pageCount;
}
/**
* {@inheritDoc}
*/
public function getItems($offset, $limit)
{
$items = $this->adapter->getItems($offset, $limit);
$oldCount = count($items);
foreach ($this->callbacks as $callback) {
$items = call_user_func($callback, $items);
}
$newCount = count($items);
if ($oldCount !== $newCount) {
throw new \LogicException(sprintf('Callbacks may not change the number of items (old count: %d, new count: %d).', $oldCount, $newCount));
}
return $items;
}
/**
* Gets items of this page as well as the 1-st item from the next page.
* Doing it this way keeps us from having to run the expensive total item
* count query in some scenarios.
*
* @return array
*/
private function getItemsWithOneExtra()
{
if (null === $this->itemsWithOneExtra) {
$this->itemsWithOneExtra = $this->adapter->getItems($this->getOffset(), $this->getLength() + 1);
}
return $this->itemsWithOneExtra;
}
/**
* Fetches the given range of items from the adapter and stores them in
* the cache array.
*
* @param integer $offset
* @param integer $limit
*/
private function cache($offset, $limit)
{
$items = $this->adapter->getItems($offset, $limit);
$i = $offset;
foreach ($items as $item) {
$this->cached[$i++] = $item;
}
if (count($items) < $limit) {
$this->lastItemPos = $i - 1;
}
}
/**
* {@inheritDoc}
*/
public function getCount(AdapterInterface $adapter, $page, $perPage)
{
return (int) ceil($adapter->getItemCount() / $perPage);
}