CMSPlugin refactoring and magic late initialisation

libraries/src/Application/ApplicationAwareInterface.php

@@ -0,0 +1,29 @@
+<?php
+
+/**
+ * Joomla! Content Management System
+ *
+ * @copyright  (C) 2022 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license    GNU General Public License version 2 or later; see LICENSE
+ */
+
+namespace Joomla\CMS\Application;
+
+/**
+ * Interface defining an object aware of the global application object
+ *
+ * @since  __DEPLOY_VERSION__
+ */
+interface ApplicationAwareInterface
+{
+    /**
+     * Sets the application to use.
+     *
+     * @param   CMSApplicationInterface  $application  The application
+     *
+     * @return  void
+     *
+     * @since   __DEPLOY_VERSION__
+     */
+    public function setApplication(CMSApplicationInterface $application): void;
+}

libraries/src/Application/ApplicationAwareTrait.php

@@ -0,0 +1,53 @@
+<?php
+
+/**
+ * Joomla! Content Management System
+ *
+ * @copyright  (C) 2022 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license    GNU General Public License version 2 or later; see LICENSE
+ */
+
+namespace Joomla\CMS\Application;
+
+/**
+ * Defines the trait for an Application Aware Class.
+ *
+ * @since   __DEPLOY_VERSION__
+ */
+trait ApplicationAwareTrait
+{
+    /**
+     * The application object
+     *
+     * @var    CMSApplicationInterface
+     *
+     * @since  __DEPLOY_VERSION__
+     */
+    private $application;
+
+    /**
+     * Sets the application to use.
+     *
+     * @param   CMSApplicationInterface  $application  The application
+     *
+     * @return  void
+     *
+     * @since   __DEPLOY_VERSION__
+     */
+    public function setApplication(CMSApplicationInterface $application): void
+    {
+        $this->application = $application;
+    }
+
+    /**
+     * Returns the internal application or null when not set.
+     *
+     * @return  CMSApplicationInterface|null
+     *
+     * @since   __DEPLOY_VERSION__
+     */
+    protected function getApplication(): ?CMSApplicationInterface
+    {
+        return $this->application;
+    }
+}

libraries/src/Plugin/AutoloadLanguageAware.php

@@ -0,0 +1,14 @@
+<?php
+
+/**
+ * Joomla! Content Management System
+ *
+ * @copyright  (C) 2022 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license    GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+namespace Joomla\CMS\Plugin;
+
+interface AutoloadLanguageAware
+{
+}