ServiceLocator.php

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<?php
namespace Magento\Setup\Module\Dependency;

use Magento\Framework\File\Csv;
use Magento\Framework\Filesystem\Driver\File;
use Magento\Setup\Module\Dependency\Circular as CircularTool;
use Magento\Setup\Module\Dependency\Report\Circular as CircularReport;
use Magento\Setup\Module\Dependency\Report\Dependency;
use Magento\Setup\Module\Dependency\Report\Framework;

class ServiceLocator
{
    private static $xmlConfigParser;

    private static $composerJsonParser;

    private static $frameworkDependenciesParser;

    private static $dependenciesReportBuilder;

    private static $circularDependenciesReportBuilder;

    private static $frameworkDependenciesReportBuilder;

    private static $csvWriter;

    public static function getDependenciesReportBuilder()
    {
        if (null === self::$dependenciesReportBuilder) {
            self::$dependenciesReportBuilder = new Dependency\Builder(
                self::getComposerJsonParser(),
                new Dependency\Writer(self::getCsvWriter())
            );
        }
        return self::$dependenciesReportBuilder;
    }

    public static function getCircularDependenciesReportBuilder()
    {
        if (null === self::$circularDependenciesReportBuilder) {
            self::$circularDependenciesReportBuilder = new CircularReport\Builder(
                self::getComposerJsonParser(),
                new CircularReport\Writer(self::getCsvWriter()),
                new CircularTool([], null)
            );
        }
        return self::$circularDependenciesReportBuilder;
    }

    public static function getFrameworkDependenciesReportBuilder()
    {
        if (null === self::$frameworkDependenciesReportBuilder) {
            self::$frameworkDependenciesReportBuilder = new Framework\Builder(
                self::getFrameworkDependenciesParser(),
                new Framework\Writer(self::getCsvWriter()),
                self::getXmlConfigParser()
            );
        }
        return self::$frameworkDependenciesReportBuilder;
    }

    private static function getXmlConfigParser()
    {
        if (null === self::$xmlConfigParser) {
            self::$xmlConfigParser = new Parser\Config\Xml();
        }
        return self::$xmlConfigParser;
    }

    private static function getComposerJsonParser()
    {
        if (null === self::$composerJsonParser) {
            self::$composerJsonParser = new Parser\Composer\Json();
        }
        return self::$composerJsonParser;
    }

    private static function getFrameworkDependenciesParser()
    {
        if (null === self::$frameworkDependenciesParser) {
            self::$frameworkDependenciesParser = new Parser\Code();
        }
        return self::$frameworkDependenciesParser;
    }

    private static function getCsvWriter()
    {
        if (null === self::$csvWriter) {
            self::$csvWriter = new Csv(new File());
        }
        return self::$csvWriter;
    }
}