Add SettingsInterface for DI container

src/Settings.php

@@ -26,7 +26,7 @@
  * @mixin CacheBehavior
  * @mixin QuickAccessBehavior
  */
-class Settings extends Component implements \ArrayAccess
+class Settings extends Component implements SettingsInterface
 {
     public const EVENT_BEFORE_GET = 'beforeGetValue';
     public const EVENT_AFTER_GET = 'afterGetValue';
@@ -82,7 +82,7 @@ public function buildKey($key)
      * @param mixed $value
      * @return string
      */
-    public function encode($value)
+    protected function encode($value)
     {
         if ($this->serializer === null) {
             return serialize($value);
@@ -97,7 +97,7 @@ public function encode($value)
      * @param string $value
      * @return mixed
      */
-    public function decode($value)
+    protected function decode($value)
     {
         if ($this->serializer === null) {
             return @unserialize($value, ['allowed_classes' => true]);

src/SettingsInterface.php

@@ -0,0 +1,26 @@
+<?php declare(strict_types=1);
+
+namespace lav45\settings;
+
+interface SettingsInterface extends \ArrayAccess
+{
+    /**
+     * @param string|array $key
+     * @param null $default
+     * @return mixed
+     */
+    public function get($key, $default = null);
+
+    /**
+     * @param string|array $key
+     * @param mixed $value
+     * @return boolean
+     */
+    public function set($key, $value);
+
+    /**
+     * @param string $key
+     * @return boolean
+     */
+    public function delete($key);
+}