ConfigData.php

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<?php
namespace Magento\Framework\Config\Data;

class ConfigData
{
    private $fileKey;

    private $data = [];

    private $overrideWhenSave = false;

    public function __construct($fileKey)
    {
        $this->fileKey = $fileKey;
    }

    public function getFileKey()
    {
        return $this->fileKey;
    }

    public function getData()
    {
        return $this->data;
    }

    public function setOverrideWhenSave($overrideWhenSave)
    {
        $this->overrideWhenSave = $overrideWhenSave;
    }

    public function isOverrideWhenSave()
    {
        return $this->overrideWhenSave;
    }

    public function set($path, $value)
    {
        $chunks = $this->expand($path);
        $data = [];
        $element = &$data;

        while ($chunks) {
            $key = array_shift($chunks);
            if ($chunks) {
                $element[$key] = [];
                $element = &$element[$key];
            } else {
                $element[$key] = $value;
            }
        }

        $this->data = array_replace_recursive($this->data, $data);
    }

    private function expand($path)
    {
        $chunks = explode('/', $path);

        foreach ($chunks as $chunk) {
            if ('' == $chunk) {
                throw new \InvalidArgumentException(
                    "Path '$path' is invalid. It cannot be empty nor start or end with '/'"
                );
            }
        }

        return $chunks;
    }
}