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File: vendor/sebastian/comparator/src/Factory.php

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File: 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.
     *
     * @param mixed $expected The first value to compare
     * @param mixed $actual The second value to compare
     * @return Comparator
     */
   
public function getComparatorFor($expected, $actual)
    {
        foreach (
$this->comparators as $comparator) {
            if (
$comparator->accepts($expected, $actual)) {
                return
$comparator;
            }
        }
    }

   
/**
     * Registers a new comparator.
     *
     * This comparator will be returned by getInstance() if its accept() method
     * returns TRUE for the compared values. It has higher priority than the
     * existing comparators, meaning that its accept() method will be tested
     * before those of the other comparators.
     *
     * @param Comparator $comparator The registered comparator
     */
   
public function register(Comparator $comparator)
    {
       
array_unshift($this->comparators, $comparator);

       
$comparator->setFactory($this);
    }

   
/**
     * Unregisters a comparator.
     *
     * This comparator will no longer be returned by getInstance().
     *
     * @param Comparator $comparator The unregistered comparator
     */
   
public function unregister(Comparator $comparator)
    {
        foreach (
$this->comparators as $key => $_comparator) {
            if (
$comparator === $_comparator) {
                unset(
$this->comparators[$key]);
            }
        }
    }
}


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