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<?php
namespace JsonApi\JsonApiIntegration;
/**
* Diese Klasse bündelt lediglich die Logik, um aus dem Triple [Gesamtanzahl,
* Offset, Limit], die neuen Triple für die nächste, vorherige, erste
* oder letzte Seite zu generieren.
*
* @internal
*/
class Paginator
{
/** @var int|null */
private $total;
/** @var int */
private $offset;
/** @var int */
private $limit;
/**
* @param int|null $total
* @param int $offset
* @param int $limit
*/
public function __construct($total, $offset, $limit)
{
$this->total = $total;
$this->offset = $offset;
$this->limit = $limit;
}
public function getFirstPageOffsetAndLimit(): array
{
if (0 === $this->limit) {
return [0, 0];
}
return [0, $this->limit];
}
public function getLastPageOffsetAndLimit(): ?array
{
if (!isset($this->total)) {
return null;
}
if ($this->limit === 0) {
return [0, 0];
}
$last = max(0, floor($this->total / $this->limit - 1) * $this->limit);
return [$last, $this->limit];
}
public function getPrevPageOffsetAndLimit(): ?array
{
if ($this->limit === 0) {
return null;
}
if ($this->offset - $this->limit < 0) {
return null;
}
return [max(0, $this->offset - $this->limit), $this->limit];
}
public function getNextPageOffsetAndLimit(): ?array
{
if ($this->limit === 0) {
return null;
}
if (isset($this->total) && $this->total <= $this->offset + $this->limit) {
return null;
}
return [$this->offset + $this->limit, $this->limit];
}
}
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