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);
+    }
+  }
+
+}

CRM/TwingleCampaign/Form/Settings.php

@@ -1,7 +1,10 @@
 <?php
 
+use CRM\TwingleCampaign\BAO\Configuration;
 use CRM_TwingleCampaign_ExtensionUtil as E;
 
+include_once E::path() . '/CRM/TwingleCampaign/BAO/Configuration.php';
+
 /**
  * Form controller class
  *
@@ -44,24 +47,13 @@ class CRM_TwingleCampaign_Form_Settings extends CRM_Core_Form {
   }
 
   public function setDefaultValues() {
-    $defaultValues['twingle_api_key'] =
-      Civi::settings()->get('twingle_api_key');
-    $defaultValues['twinglecampaign_xcm_profile'] =
-      Civi::settings()->get('twinglecampaign_xcm_profile');
-    $defaultValues['twinglecampaign_start_case'] =
-      Civi::settings()->get('twinglecampaign_start_case');
-    return $defaultValues;
+    return Configuration::get();
   }
 
   //TODO: validate Twingle API key
 
   public function postProcess() {
-    $values = $this->exportValues();
-    Civi::settings()->set('twingle_api_key', $values['twingle_api_key']);
-    Civi::settings()
-      ->set('twinglecampaign_xcm_profile', $values['twinglecampaign_xcm_profile']);
-    Civi::settings()
-      ->set('twinglecampaign_start_case', $values['twinglecampaign_start_case']);
+    Configuration::set($this->exportValues());
     parent::postProcess();
   }