create own Configuration class to handle settings

CRM/TwingleCampaign/BAO/Configuration.php

@@ -0,0 +1,60 @@
+<?php
+
+
+namespace CRM\TwingleCampaign\BAO;
+
+use Civi;
+
+class Configuration {
+
+  private static $settingsKeys = [
+    'twingle_api_key',
+    'twinglecampaign_xcm_profile',
+    'twinglecampaign_start_case',
+  ];
+
+
+  /**
+   * Stores a setting in Civi::settings
+   *
+   * @param array $settings
+   * Expects an array with key => value for the setting
+   */
+  public static function set(array $settings) {
+      Civi::settings()->add($settings);
+  }
+
+
+  /**
+   * Returns a specific value of a setting if the key is passed as parameter.
+   * Else all settings will be returned als associative array.
+   *
+   * @param null $key
+   * The name of the setting or NULL
+   *
+   * @return array|mixed|null
+   */
+  public static function get($key = NULL) {
+    if ($key) {
+      return Civi::settings()->get($key);
+    }
+    else {
+      $settings = [];
+      foreach (self::$settingsKeys as $key) {
+        $settings[$key] = Civi::settings()->get($key);
+      }
+      return $settings;
+    }
+  }
+
+
+  /**
+   * Delete all settings of the TwingleCampaign extension
+   */
+  public static function deleteAll() {
+    foreach (self::$settingsKeys as $key) {
+      Civi::settings()->set($key, NULL);
+    }
+  }
+
+}