Add upstream plugins

Signed-off-by: Adrian Nöthlich <git@promasu.tech>

wp-content/plugins/all-in-one-event-calendar/app/controller/calendar-feeds.php

@@ -0,0 +1,84 @@
+<?php
+
+/**
+ * Feeds (import and export streams) mediator.
+ *
+ * @author     Time.ly Network Inc.
+ * @since      2.0
+ *
+ * @package    AI1EC
+ * @subpackage AI1EC.Controller
+ */
+class Ai1ec_Controller_Calendar_Feeds extends Ai1ec_Base {
+
+    /**
+     * @var array Holds the instances of registered plugins.
+     */
+    protected $_plugins = array();
+
+    /**
+     * Add plugin to the internal array.
+     *
+     * This assure us that the plugins extends our base abstract class.
+     *
+     * @param Ai1ec_Connector_Plugin $plugin Plugin to add.
+     *
+     * @return void
+     */
+    public function add_plugin( Ai1ec_Connector_Plugin $plugin ) {
+        $plugin->initialize_settings_if_not_set();
+        $this->_plugins[] = $plugin;
+    }
+
+    /**
+     * Get an instance of a plugin class
+     *
+     * @param string $class
+     * @throws Exception
+     * @return Ai1ec_Connector_Plugin
+     */
+    public function get_plugin_instance( $class ) {
+        foreach ( $this->_plugins as $plugin ) {
+            if( get_class( $plugin ) === $class ) {
+                return $plugin;
+            }
+        }
+        throw new Exception( "Class not found" );
+    }
+
+    /**
+     * Give the plugins the possibility to handle data posted in the calendar feeds page
+     *
+     * @return void
+     */
+    public function handle_feeds_page_post() {
+        // Iterate over the plugins and call the methods
+        foreach ( $this->_plugins as $plugin ) {
+            $plugin->handle_feeds_page_post();
+        }
+    }
+
+    /**
+     * Render the tab header for each plugin
+     *
+     * @param $active_feed
+     *   The tab that should be visualized
+     */
+    public function render_tab_headers() {
+        foreach ( $this->_plugins as $plugin ) {
+            $plugin->render_tab_header();
+        }
+    }
+    /**
+     * Render the tab body for each plugin
+     *
+     * @param $active_feed
+     *   The tab that should be visualized
+     */
+    public function render_tab_contents() {
+        foreach ( $this->_plugins as $plugin ) {
+            $plugin->render_tab_content();
+        }
+    }
+
+}