Add upstream

wp-content/plugins/jetpack/modules/google-analytics/wp-google-analytics.php

@@ -0,0 +1,76 @@
+<?php
+/*
+    Copyright 2006 Aaron D. Campbell (email : wp_plugins@xavisys.com)
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
+/**
+ * Jetpack_Google_Analytics is the class that handles ALL of the plugin functionality.
+ * It helps us avoid name collisions
+ * http://codex.wordpress.org/Writing_a_Plugin#Avoiding_Function_Name_Collisions
+ */
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit;
+}
+
+require_once( plugin_basename( 'classes/wp-google-analytics-utils.php' ) );
+require_once( plugin_basename( 'classes/wp-google-analytics-options.php' ) );
+require_once( plugin_basename( 'classes/wp-google-analytics-legacy.php' ) );
+require_once( plugin_basename( 'classes/wp-google-analytics-universal.php' ) );
+
+class Jetpack_Google_Analytics {
+
+	/**
+	 * @var Jetpack_Google_Analytics - Static property to hold our singleton instance
+	 */
+	static $instance = false;
+
+	/**
+	 * @var Static property to hold concrete analytics impl that does the work (universal or legacy)
+	 */
+	static $analytics = false;
+
+	/**
+	 * This is our constructor, which is private to force the use of get_instance()
+	 *
+	 * @return void
+	 */
+	private function __construct() {
+		// At this time, we only leverage universal analytics when enhanced ecommerce is selected and WooCommerce is active.
+		// Otherwise, don't bother emitting the tracking ID or fetching analytics.js
+		if ( class_exists( 'WooCommerce' ) && Jetpack_Google_Analytics_Options::enhanced_ecommerce_tracking_is_enabled() ) {
+			$analytics = new Jetpack_Google_Analytics_Universal();
+		} else {
+			$analytics = new Jetpack_Google_Analytics_Legacy();
+		}
+
+	}
+
+	/**
+	 * Function to instantiate our class and make it a singleton
+	 */
+	public static function get_instance() {
+		if ( ! self::$instance ) {
+			self::$instance = new self;
+		}
+
+		return self::$instance;
+	}
+}
+
+global $jetpack_google_analytics;
+$jetpack_google_analytics = Jetpack_Google_Analytics::get_instance();