[ResourceWatcher] created basic resource event listener object

src/Symfony/Component/ResourceWatcher/Event/EventListener.php

@@ -0,0 +1,76 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\ResourceWatcher\Event;
+
+use Symfony\Component\Config\Resource\ResourceInterface;
+
+/**
+ * Resource change listener.
+ *
+ * @author Konstantin Kudryashov <ever.zet@gmail.com>
+ */
+class EventListener implements EventListenerInterface
+{
+    private $resource;
+    private $callback;
+    private $eventsMask;
+
+    /**
+     * Initializes listener.
+     *
+     * @param   ResourceInterface   $resource   resource to listen
+     * @param   callable            $callback   callback to call on event
+     * @param   integer             $eventsMask event types to listen
+     */
+    public function __construct(ResourceInterface $resource, $callback, $eventsMask)
+    {
+        if (!is_callable($callback)) {
+            throw new \InvalidArgumentException(
+                'EventListener\'s second argument should be callable.'
+            );
+        }
+
+        $this->resource     = $resource;
+        $this->callback     = $callback;
+        $this->eventsMask   = $eventsMask;
+    }
+
+    /**
+     * Returns listening resource.
+     *
+     * @return  ResourceInterface
+     */
+    public function getResource()
+    {
+        return $this->resource;
+    }
+
+    /**
+     * Returns callback.
+     *
+     * @return  callable
+     */
+    public function getCallback()
+    {
+        return $this->callback;
+    }
+
+    /**
+     * Checks whether listener can handle provided resource event.
+     *
+     * @param   Event   $event
+     */
+    public function handles(Event $event)
+    {
+        return 0 !== ($this->eventsMask & $event->getType());
+    }
+}

tests/Symfony/Tests/Component/ResourceWatcher/Event/EventListenerTest.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Tests\Component\ResourceWatcher\Event;
+
+use Symfony\Component\Config\Resource\FileResource;
+use Symfony\Component\ResourceWatcher\Event\Event;
+use Symfony\Component\ResourceWatcher\Event\EventListener;
+
+class EventListenerTest extends \PHPUnit_Framework_TestCase
+{
+    public function testConstructAndGetters()
+    {
+        $listener = new EventListener($res = new FileResource(__FILE__), $cb = function(){}, Event::CREATED);
+
+        $this->assertSame($res, $listener->getResource());
+        $this->assertSame($cb, $listener->getCallback());
+    }
+
+    public function testHandles()
+    {
+        $res    = new FileResource(__FILE__);
+        $cb     = function(){};
+
+        $listener = new EventListener($res, $cb, Event::CREATED);
+
+        $this->assertTrue($listener->handles(new Event(1, $res, $type = Event::CREATED)));
+        $this->assertFalse($listener->handles(new Event(1, $res, $type = Event::MODIFIED)));
+        $this->assertFalse($listener->handles(new Event(1, $res, $type = Event::DELETED)));
+
+        $listener = new EventListener($res, $cb, Event::CREATED | Event::DELETED);
+
+        $this->assertTrue($listener->handles(new Event(1, $res, $type = Event::CREATED)));
+        $this->assertFalse($listener->handles(new Event(1, $res, $type = Event::MODIFIED)));
+        $this->assertTrue($listener->handles(new Event(1, $res, $type = Event::DELETED)));
+
+        $listener = new EventListener($res, $cb, Event::ALL);
+
+        $this->assertTrue($listener->handles(new Event(1, $res, $type = Event::CREATED)));
+        $this->assertTrue($listener->handles(new Event(1, $res, $type = Event::MODIFIED)));
+        $this->assertTrue($listener->handles(new Event(1, $res, $type = Event::DELETED)));
+
+        $listener = new EventListener($res, $cb, Event::DELETED);
+
+        $this->assertFalse($listener->handles(new Event(1, $res, $type = Event::CREATED)));
+        $this->assertFalse($listener->handles(new Event(1, $res, $type = Event::MODIFIED)));
+        $this->assertTrue($listener->handles(new Event(1, $res, $type = Event::DELETED)));
+    }
+}