Updated the caching framework to the according FLOW3 revision 2616

[Packages/TYPO3.CMS.git] / t3lib / cache / backend / class.t3lib_cache_backend_abstractbackend.php

diff --git a/t3lib/cache/backend/class.t3lib_cache_backend_abstractbackend.php b/t3lib/cache/backend/class.t3lib_cache_backend_abstractbackend.php
index 6b4eca3..4bc5d2e 100644 (file)
--- a/t3lib/cache/backend/class.t3lib_cache_backend_abstractbackend.php
+++ b/t3lib/cache/backend/class.t3lib_cache_backend_abstractbackend.php
@@ -34,6 +34,9 @@
  */
 abstract class t3lib_cache_backend_AbstractBackend implements t3lib_cache_backend_Backend {
 
+       const DATETIME_EXPIRYTIME_UNLIMITED = '9999-12-31T23:59:59+0000';
+       const UNLIMITED_LIFETIME = 0;
+
        /**
         * Reference to the cache which uses this backend
         *
@@ -96,6 +99,29 @@ abstract class t3lib_cache_backend_AbstractBackend implements t3lib_cache_backen
                $this->defaultLifetime = $defaultLifetime;
        }
 
+       /**
+        * Calculates the expiry time by the given lifetime. If no lifetime is
+        * specified, the default lifetime is used.
+        *
+        * @param integer $lifetime The lifetime in seconds
+        * @return \DateTime The expiry time
+        * @author Robert Lemke <robert@typo3.org>
+        * @internal
+        */
+       protected function calculateExpiryTime($lifetime = NULL) {
+               if ($lifetime === self::UNLIMITED_LIFETIME || ($lifetime === NULL && $this->defaultLifetime === self::UNLIMITED_LIFETIME)) {
+                       $expiryTime = new DateTime(self::DATETIME_EXPIRYTIME_UNLIMITED, new DateTimeZone('UTC'));
+               } else {
+                       if ($lifetime === NULL) {
+                               $lifetime = $this->defaultLifetime;
+                       }
+                       $expiryTime = new DateTime('now +' . $lifetime . ' seconds', new DateTimeZone('UTC'));
+               }
+
+               return $expiryTime;
+       }
+
+
 }