lib/PHPExif/Adapter/AdapterAbstract.php
public function getMapper()
    {
        if (null === $this->mapper) {
            // lazy load one
            $mapper = new $this->mapperClass;

            $this->setMapper($mapper);
        }

        return $this->mapper;
    }
public function getMapper()
    {
        if (null === $this->mapper) {
            // lazy load one
            $mapper = new $this->mapperClass;

            $this->setMapper($mapper);
        }

        return $this->mapper;
    }
Accessor for the data mapper

@return \PHPExif\Mapper\MapperInterface