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<?php
namespace Charcoal\Source\Database;
use UnexpectedValueException;
// From 'charcoal-core'
use Charcoal\Source\Database\DatabaseExpressionInterface;
use Charcoal\Source\Expression;
/**
* The DatabaseFilter makes a Filter SQL-aware.
*/
class DatabaseExpression extends Expression implements
DatabaseExpressionInterface
{
* Retrieve the Filter's SQL as a string to append to a WHERE clause.
*
* @return string
public function sql()
if ($this->active() && $this->hasCondition()) {
return $this->byCondition();
}
return '';
* Retrieve the custom expression.
* @throws UnexpectedValueException If the custom expression is empty.
protected function byCondition()
if (!$this->hasCondition()) {
throw new UnexpectedValueException(
'Custom expression can not be empty.'
);
return $this->condition();
locomotivemtl /
charcoal-core
