--- /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;
+
+use Behat\Testwork\Call\Callee;
+use Behat\Testwork\Environment\Exception\EnvironmentBuildException;
+use Behat\Testwork\Environment\Exception\EnvironmentIsolationException;
+use Behat\Testwork\Environment\Handler\EnvironmentHandler;
+use Behat\Testwork\Environment\Reader\EnvironmentReader;
+use Behat\Testwork\Suite\Suite;
+
+/**
+ * Builds, isolates and reads environments using registered handlers and readers.
+ *
+ * @author Konstantin Kudryashov <ever.zet@gmail.com>
+ */
+final class EnvironmentManager
+{
+ /**
+ * @var EnvironmentHandler[]
+ */
+ private $handlers = array();
+ /**
+ * @var EnvironmentReader[]
+ */
+ private $readers = array();
+
+ /**
+ * Registers environment handler.
+ *
+ * @param EnvironmentHandler $handler
+ */
+ public function registerEnvironmentHandler(EnvironmentHandler $handler)
+ {
+ $this->handlers[] = $handler;
+ }
+
+ /**
+ * Registers environment reader.
+ *
+ * @param EnvironmentReader $reader
+ */
+ public function registerEnvironmentReader(EnvironmentReader $reader)
+ {
+ $this->readers[] = $reader;
+ }
+
+ /**
+ * Builds new environment for provided test suite.
+ *
+ * @param Suite $suite
+ *
+ * @return Environment
+ *
+ * @throws EnvironmentBuildException
+ */
+ public function buildEnvironment(Suite $suite)
+ {
+ foreach ($this->handlers as $handler) {
+ if ($handler->supportsSuite($suite)) {
+ return $handler->buildEnvironment($suite);
+ }
+ }
+
+ throw new EnvironmentBuildException(sprintf(
+ 'None of the registered environment handlers seem to support `%s` suite.',
+ $suite->getName()
+ ), $suite);
+ }
+
+ /**
+ * Creates new isolated test environment using built one.
+ *
+ * @param Environment $environment
+ * @param mixed $testSubject
+ *
+ * @return Environment
+ *
+ * @throws EnvironmentIsolationException If appropriate environment handler is not found
+ */
+ public function isolateEnvironment(Environment $environment, $testSubject = null)
+ {
+ foreach ($this->handlers as $handler) {
+ if ($handler->supportsEnvironmentAndSubject($environment, $testSubject)) {
+ return $handler->isolateEnvironment($environment, $testSubject);
+ }
+ }
+
+ throw new EnvironmentIsolationException(sprintf(
+ 'None of the registered environment handlers seem to support `%s` environment.',
+ get_class($environment)
+ ), $environment, $testSubject);
+ }
+
+ /**
+ * Reads all callees from environment using registered environment readers.
+ *
+ * @param Environment $environment
+ *
+ * @return Callee[]
+ */
+ public function readEnvironmentCallees(Environment $environment)
+ {
+ $callees = array();
+ foreach ($this->readers as $reader) {
+ if ($reader->supportsEnvironment($environment)) {
+ $callees = array_merge($callees, $reader->readEnvironmentCallees($environment));
+ }
+ }
+
+ return $callees;
+ }
+}