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<?php
namespace Mattbit\Flat\Query\Expression\Leaf;
use DateTime;
use Mattbit\Flat\Model\Date;
use Mattbit\Flat\Model\DocumentInterface;
use Mattbit\Flat\Query\Expression\ExpressionInterface;
abstract class Expression implements ExpressionInterface
{
protected $key;
protected $reference;
public function __construct($key, $reference)
$this->key = $key;
$this->reference = $reference;
}
abstract public function match(DocumentInterface $document);
public function getKey()
return $this->key;
public function getReference()
return $this->reference;
public function getValue(DocumentInterface $document)
$value = $document->get($this->key);
if ($this->reference instanceof DateTime) {
return new DateTime($value);
return $value;
mattbit /
flat
