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system/vendor/swift/Swift/Cache.php

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+<?php
+
+/**
+ * Swift Mailer Runtime caching base component.
+ * Please read the LICENSE file
+ * @author Chris Corbyn <chris@w3style.co.uk>
+ * @package Swift_Cache
+ * @license GNU Lesser General Public License
+ */
+ 
+require_once dirname(__FILE__) . "/ClassLoader.php";
+
+/**
+ * The interface for any cache mechanisms to follow
+ * @package Swift_Cache
+ * @author Chris Corbyn <chris@w3style.co.uk>
+ */
+abstract class Swift_Cache
+{
+  /**
+   * Append bytes to the cache buffer identified by $key
+   * @param string The Cache key
+   * @param string The bytes to append
+   */
+  abstract public function write($key, $data);
+  /**
+   * Clear out the buffer for $key
+   * @param string The cache key
+   */
+  abstract public function clear($key);
+  /**
+   * Check if there is something in the cache for $key
+   * @param string The cache key
+   * @return boolean
+   */
+  abstract public function has($key);
+  /**
+   * Read bytes from the cached buffer and seek forward in the buffer
+   * Returns false once no more bytes are left to read
+   * @param int The number of bytes to read (may be ignored)
+   * @return string
+   */
+  abstract public function read($key, $size=null);
+  /**
+   * A factory method to return an output stream object for the relevant location in the cache
+   * @param string The cache key to fetch the stream for
+   * @return Swift_Cache_OutputStream
+   */
+  public function getOutputStream($key)
+  {
+    Swift_ClassLoader::load("Swift_Cache_OutputStream");
+    $os = new Swift_Cache_OutputStream($this, $key);
+    return $os;
+  }
+}