MessageConfigurationsPool.php

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<?php
namespace Magento\Framework\View\Element\Message;

class MessageConfigurationsPool
{
    private $configurationsMap;

    public function __construct(
        array $configurationsMap = []
    ) {
        array_walk(
            $configurationsMap,
            function (array &$configuration) {
                if (!isset($configuration['renderer'])
                    || !is_string($configuration['renderer'])
                ) {
                    throw new \InvalidArgumentException('Renderer should be defined.');
                }

                if (isset($configuration['data'])
                    && !is_array($configuration['data'])
                ) {
                    throw new \InvalidArgumentException('Data should be of array type.');
                }

                if (!isset($configuration['data'])) {
                    $configuration['data'] = [];
                }
            }
        );

        $this->configurationsMap = $configurationsMap;
    }

    public function getMessageConfiguration($identifier)
    {
        return !isset($this->configurationsMap[$identifier])
            ? null
            : $this->configurationsMap[$identifier];
    }
}