first commit

wp-content/plugins/sitepress-multilingual-cms/classes/utilities/class-wpml-non-persistent-cache.php

@@ -0,0 +1,102 @@
+<?php
+
+/**
+ * Class WPML_Non_Persistent_Cache
+ *
+ * Implements non-persistent cache based on an array. Suitable to cache objects during single page load.
+ */
+class WPML_Non_Persistent_Cache {
+
+	/**
+	 * @var array Cached objects.
+	 */
+	private static $cache = array();
+
+	/**
+	 * Retrieves the data contents from the cache, if it exists.
+	 *
+	 * @param string $key   Cache key.
+	 * @param string $group Cache group.
+	 * @param bool   $found Whether the key was found in the cache (passed by reference).
+	 *                      Disambiguates a return of false, a storable value.
+	 *
+	 * @return mixed|bool
+	 */
+	public static function get( $key, $group = 'default', &$found = null ) {
+		if (
+			isset( self::$cache[ $group ] ) &&
+			( isset( self::$cache[ $group ][ $key ] ) || array_key_exists( $key, self::$cache[ $group ] ) )
+		) {
+			$found = true;
+
+			return self::$cache[ $group ][ $key ];
+		}
+		$found = false;
+
+		return false;
+	}
+
+	/**
+	 * Sets the data contents into the cache.
+	 *
+	 * @param string $key   Cache key.
+	 * @param mixed  $data  Data to store in cache.
+	 * @param string $group Cache group.
+	 *
+	 * @return bool
+	 */
+	public static function set( $key, $data, $group = 'default' ) {
+		if ( is_object( $data ) ) {
+			$data = clone $data;
+		}
+		self::$cache[ $group ][ $key ] = $data;
+
+		return true;
+	}
+
+	/**
+	 * Executes callback function and caches its result.
+	 *
+	 * @param string   $key      Cache key.
+	 * @param callable $callback Callback function.
+	 * @param string   $group    Cache group.
+	 *
+	 * @return bool
+	 */
+	public static function execute_and_cache( $key, $callback, $group = 'default' ) {
+		$data = self::get( $key, $group, $found );
+		if ( ! $found ) {
+			$data = $callback();
+			self::set( $key, $data, $group );
+		}
+
+		return $data;
+	}
+
+	/**
+	 * Flush cache.
+	 *
+	 * @return bool
+	 */
+	public static function flush() {
+		self::$cache = array();
+
+		return true;
+	}
+
+	/**
+	 * Flush cache group.
+	 *
+	 * @param array|string $groups Cache group name.
+	 *
+	 * @return bool
+	 */
+	public static function flush_group( $groups = 'default' ) {
+		$groups = (array) $groups;
+		foreach ( $groups as $group ) {
+			unset( self::$cache[ $group ] );
+		}
+
+		return true;
+	}
+}