1 files changed, 82 insertions, 0 deletions
diff --git a/application/libraries/Output_cache.php b/application/libraries/Output_cache.php
new file mode 100644
index 000000000..1d8339887
--- /dev/null
+++ b/application/libraries/Output_cache.php
@@ -0,0 +1,82 @@
+<?php
+/*
+ * Copyright 2014,2016 Florian "Bluewind" Pritz <bluewind@server-speed.net>
+ *
+ * Licensed under AGPLv3
+ * (see COPYING for full license text)
+ *
+ */
+
+namespace libraries;
+
+class Output_cache {
+	private $output_cache = array();
+
+	/**
+	 * Combine multiple objects for the same view into one
+	 * @param data data to pass to the view
+	 * @param view view path
+	 */
+	public function add_merge($data, $view)
+	{
+		assert($view !== NULL);
+
+		// combine multiple objects for the same view into one
+		$count = count($this->output_cache);
+		if ($count > 0 && $this->output_cache[$count - 1]["view"] === $view) {
+			$this->output_cache[$count - 1]["data"] = array_merge_recursive($this->output_cache[$count - 1]["data"], $data);
+		} else {
+			$this->add($data, $view);
+		}
+	}
+
+	/**
+	 * Add some data that will be output directly if view is NULL or passed
+	 * to the view otherweise.
+	 *
+	 * @param data data to pass to view or output
+	 * @param view view path or NULL
+	 */
+	public function add($data, $view = NULL)
+	{
+		$this->output_cache[] = array(
+			"view" => $view,
+			"data" => $data,
+		);
+	}
+
+	/**
+	 * Add a function that will be excuted when render() is called.
+	 * This function is supposed to use render_now() to output data.
+	 *
+	 * @param data_function
+	 */
+	public function add_function($data_function)
+	{
+		$this->output_cache[] = array(
+			"view" => NULL,
+			"data_function" => $data_function,
+		);
+	}
+
+	public function render_now($data, $view = NULL)
+	{
+		if ($view !== NULL) {
+			echo get_instance()->load->view($view, $data, true);
+		} else {
+			echo $data;
+		}
+	}
+
+	public function render()
+	{
+		while ($output = array_shift($this->output_cache)) {
+			if (isset($output["data_function"])) {
+				$output["data_function"]();
+			} else {
+				$data = $output["data"];
+				$this->render_now($data, $output["view"]);
+			}
+		}
+	}
+}