vendor/sebastian/comparator/src/Factory.php

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<?php
/*
 * This file is part of the Comparator package.
 *
 * (c) Sebastian Bergmann <sebastian@phpunit.de>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace SebastianBergmann\Comparator;

/**
 * Factory for comparators which compare values for equality.
 */
class Factory
{
    /**
     * @var Comparator[]
     */
    private $comparators = array();

    /**
     * @var Factory
     */
    private static $instance;

    /**
     * Constructs a new factory.
     */
    public function __construct()
    {
        $this->register(new TypeComparator);
        $this->register(new ScalarComparator);
        $this->register(new NumericComparator);
        $this->register(new DoubleComparator);
        $this->register(new ArrayComparator);
        $this->register(new ResourceComparator);
        $this->register(new ObjectComparator);
        $this->register(new ExceptionComparator);
        $this->register(new SplObjectStorageComparator);
        $this->register(new DOMNodeComparator);
        $this->register(new MockObjectComparator);
        $this->register(new DateTimeComparator);
    }

    /**
     * @return Factory
     */
    public static function getInstance()
    {
        if (self::$instance === null) {
            self::$instance = new self;
        }

        return self::$instance;
    }

    /**
     * Returns the correct comparator for comparing two values.