Mapper.php

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<?php
namespace Magento\Framework\DataObject;

class Mapper
{
    public static function &accumulateByMap($from, $to, array $map, array $defaults = [])
    {
        $get = 'getData';
        if (is_array(
            $from
        ) && isset(
            $from[0]
        ) && is_object(
            $from[0]
        ) && isset(
            $from[1]
        ) && is_string(
            $from[1]
        ) && is_callable(
            $from
        )
        ) {
            list($from, $get) = $from;
        }
        $fromIsArray = is_array($from);
        $fromIsVO = $from instanceof \Magento\Framework\DataObject;

        $set = 'setData';
        if (is_array(
            $to
        ) && isset(
            $to[0]
        ) && is_object(
            $to[0]
        ) && isset(
            $to[1]
        ) && is_string(
            $to[1]
        ) && is_callable(
            $to
        )
        ) {
            list($to, $set) = $to;
        }
        $toIsArray = is_array($to);
        $toIsVO = $to instanceof \Magento\Framework\DataObject;

        foreach ($map as $keyFrom => $keyTo) {
            if (!is_string($keyFrom)) {
                $keyFrom = $keyTo;
            }
            if ($fromIsArray) {
                if (array_key_exists($keyFrom, $from)) {
                    if ($toIsArray) {
                        $to[$keyTo] = $from[$keyFrom];
                    } elseif ($toIsVO) {
                        $to->{$set}($keyTo, $from[$keyFrom]);
                    }
                }
            } elseif ($fromIsVO) {
                // get value if (any) value is found as in magic data or a non-empty value with declared getter
                $value = null;
                if ($shouldGet = $from->hasData($keyFrom)) {
                    $value = $from->{$get}($keyFrom);
                } elseif (method_exists($from, $get)) {
                    $value = $from->{$get}($keyFrom);
                    if ($value) {
                        $shouldGet = true;
                    }
                }
                if ($shouldGet) {
                    if ($toIsArray) {
                        $to[$keyTo] = $value;
                    } elseif ($toIsVO) {
                        $to->{$set}($keyTo, $value);
                    }
                }
            }
        }
        foreach ($defaults as $keyTo => $value) {
            if ($toIsArray) {
                if (!isset($to[$keyTo])) {
                    $to[$keyTo] = $value;
                }
            } elseif ($toIsVO) {
                if (!$to->hasData($keyTo)) {
                    $to->{$set}($keyTo, $value);
                }
            }
        }
        return $to;
    }
}