src/Entity/Hydrator/Strategy/FileCopyStrategy.php
public function hydrate($value)
    {
        if (!is_array($value)) {
            return null;
        }

        $entity = $this->getTargetEntity();

        foreach ($value as $key=>$v) {
            $entity->{"set$key"}($v);
        }
        return $entity;
    }
public function hydrate($value)
    {
        if (!is_array($value)) {
            return null;
        }

        $entity = $this->getTargetEntity();

        foreach ($value as $key=>$v) {
            $entity->{"set$key"}($v);
        }
        return $entity;
    }
Hydrates and returns a clone of the target entity.

<b>$value</b> must be either null or the array returned from
{@link extract()}.

if <b>$value</b> is null, nothing is done and <i>NULL</i> is returned.

@param array|null $value
@return FileInterface
@see \Zend\Hydrator\Strategy\StrategyInterface::hydrate()