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[EDIT] FILE: DefinitionFile.php

<?php

declare(strict_types=1);

namespace DI\Definition\Source;

use DI\Definition\Definition;

/**
 * Reads DI definitions from a file returning a PHP array.
 *
 * @author Matthieu Napoli <matthieu@mnapoli.fr>
 */
class DefinitionFile extends DefinitionArray
{
    private bool $initialized = false;

/**
     * @param string $file File in which the definitions are returned as an array.
     */
    public function __construct(
        private string $file,
        ?Autowiring $autowiring = null,
    ) {
        // Lazy-loading to improve performances
        parent::__construct([], $autowiring);
    }

public function getDefinition(string $name) : ?Definition
    {
        $this->initialize();

return parent::getDefinition($name);
    }

public function getDefinitions() : array
    {
        $this->initialize();

return parent::getDefinitions();
    }

/**
     * Lazy-loading of the definitions.
     */
    private function initialize() : void
    {
        if ($this->initialized === true) {
            return;
        }

$definitions = require $this->file;

if (! is_array($definitions)) {
            throw new \Exception("File $this->file should return an array of definitions");
        }

$this->addDefinitions($definitions);

$this->initialized = true;
    }
}

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