--- /dev/null
+<?php
+
+/*
+ * This file is part of the Behat Testwork.
+ * (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\Environment\Reader;
+
+use Behat\Testwork\Call\Callee;
+use Behat\Testwork\Environment\Environment;
+use Behat\Testwork\Environment\EnvironmentManager;
+
+/**
+ * Reads callees from a provided environment.
+ *
+ * @see EnvironmentManager
+ *
+ * @author Konstantin Kudryashov <ever.zet@gmail.com>
+ */
+interface EnvironmentReader
+{
+ /**
+ * Checks if reader supports an environment.
+ *
+ * @param Environment $environment
+ *
+ * @return Boolean
+ */
+ public function supportsEnvironment(Environment $environment);
+
+ /**
+ * Reads callees from an environment.
+ *
+ * @param Environment $environment
+ *
+ * @return Callee[]
+ */
+ public function readEnvironmentCallees(Environment $environment);
+}