ArrayNodeConfig.php

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

class ArrayNodeConfig
{
    private $nodePathMatcher;

    private $assocArrays = [];

    private $numericArrays = [];

    public function __construct(
        NodePathMatcher $nodePathMatcher,
        array $assocArrayAttributes,
        array $numericArrays = []
    ) {
        $this->nodePathMatcher = $nodePathMatcher;
        $this->assocArrays = $assocArrayAttributes;
        $this->numericArrays = $numericArrays;
    }

    public function isNumericArray($nodeXpath)
    {
        foreach ($this->numericArrays as $pathPattern) {
            if ($this->nodePathMatcher->match($pathPattern, $nodeXpath)) {
                return true;
            }
        }
        return false;
    }

    public function getAssocArrayKeyAttribute($nodeXpath)
    {
        foreach ($this->assocArrays as $pathPattern => $keyAttribute) {
            if ($this->nodePathMatcher->match($pathPattern, $nodeXpath)) {
                return $keyAttribute;
            }
        }
        return null;
    }
}