Move plugin files to a subfolder

[MAILPOET-3988]

mailpoet/lib/Features/FeaturesController.php

@@ -0,0 +1,75 @@
+<?php
+
+namespace MailPoet\Features;
+
+use MailPoetVendor\Doctrine\DBAL\Exception\TableNotFoundException;
+
+class FeaturesController {
+
+  // Define feature defaults in the array below in the following form:
+  //   self::FEATURE_NAME_OF_FEATURE => true,
+  private $defaults = [];
+
+  /** @var array */
+  private $flags;
+
+  /** @var FeatureFlagsRepository */
+  private $featureFlagsRepository;
+
+  public function __construct(
+    FeatureFlagsRepository $featureFlagsRepository
+  ) {
+    $this->featureFlagsRepository = $featureFlagsRepository;
+  }
+
+  /** @return bool */
+  public function isSupported($feature) {
+    if (!$this->exists($feature)) {
+      throw new \RuntimeException("Unknown feature '$feature'");
+    }
+    // ensure controller works even if used before migrator, return default value in such case
+    try {
+      $this->ensureFlagsLoaded();
+    } catch (TableNotFoundException $e) {
+      return $this->defaults[$feature];
+    }
+    return $this->flags[$feature];
+  }
+
+  /** @return bool */
+  public function exists($feature) {
+    return array_key_exists($feature, $this->defaults);
+  }
+
+  /** @return array */
+  public function getDefaults() {
+    return $this->defaults;
+  }
+
+  /** @return array */
+  public function getAllFlags() {
+    $this->ensureFlagsLoaded();
+    return $this->flags;
+  }
+
+  private function ensureFlagsLoaded() {
+    if ($this->flags !== null) {
+      return;
+    }
+
+    $flagsMap = $this->getValueMap();
+    $this->flags = [];
+    foreach ($this->defaults as $name => $default) {
+      $this->flags[$name] = isset($flagsMap[$name]) ? $flagsMap[$name] : $default;
+    }
+  }
+
+  private function getValueMap() {
+    $features = $this->featureFlagsRepository->findAll();
+    $featuresMap = [];
+    foreach ($features as $feature) {
+      $featuresMap[$feature->getName()] = (bool)$feature->getValue();
+    }
+    return $featuresMap;
+  }
+}