--- /dev/null
+<?php
+
+/*
+ * This file is part of the Behat.
+ * (c) Konstantin Kudryashov <ever.zet@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Behat\Testwork\Output\Node\EventListener\Flow;
+
+use Behat\Testwork\Output\Formatter;
+use Behat\Testwork\Output\Node\EventListener\EventListener;
+use Symfony\Component\EventDispatcher\Event;
+
+/**
+ * Catches all events, but proxies them only if formatter has specific parameter set to a specific value.
+ *
+ * @author Konstantin Kudryashov <ever.zet@gmail.com>
+ */
+class FireOnlyIfFormatterParameterListener implements EventListener
+{
+ /**
+ * @var string
+ */
+ private $name;
+ /**
+ * @var mixed
+ */
+ private $value;
+ /**
+ * @var EventListener
+ */
+ private $descendant;
+
+ /**
+ * Initializes listener.
+ *
+ * @param string $name
+ * @param mixed $value
+ * @param EventListener $descendant
+ */
+ public function __construct($name, $value, EventListener $descendant)
+ {
+ $this->name = $name;
+ $this->value = $value;
+ $this->descendant = $descendant;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function listenEvent(Formatter $formatter, Event $event, $eventName)
+ {
+ if ($this->value !== $formatter->getParameter($this->name)) {
+ return;
+ }
+
+ $this->descendant->listenEvent($formatter, $event, $eventName);
+ }
+}