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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]);
+            }
+        }
+    }
+}