<?php
/**
* Zend Framework
*
* LICENSE
*
* This source file is subject to the new BSD license that is bundled
* with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://framework.zend.com/license/new-bsd
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@zend.com so we can send you a copy immediately.
*
* @category Zend
* @package Zend_Cache
* @subpackage Zend_Cache_Frontend
* @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id$
*/


/**
* @see Zend_Cache_Core
*/
#require_once 'Zend/Cache/Core.php';


/**
* @package Zend_Cache
* @subpackage Zend_Cache_Frontend
* @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Cache_Frontend_Output extends Zend_Cache_Core
{

private $_idStack = array();

/**
* Constructor
*
* @param array $options Associative array of options
* @return void
*/
public function __construct(array $options = array())
{
parent::__construct($options);
$this->_idStack = array();
}

/**
* Start the cache
*
* @param string $id Cache id
* @param boolean $doNotTestCacheValidity If set to true, the cache validity won't be tested
* @param boolean $echoData If set to true, datas are sent to the browser if the cache is hit (simply returned else)
* @return mixed True if the cache is hit (false else) with $echoData=true (default) ; string else (datas)
*/
public function start($id, $doNotTestCacheValidity = false, $echoData = true)
{
$data = $this->load($id, $doNotTestCacheValidity);
if ($data !== false) {
if ( $echoData ) {
echo($data);
return true;
} else {
return $data;
}
}
ob_start();
ob_implicit_flush(false);
$this->_idStack[] = $id;
return false;
}

/**
* Stop the cache
*
* @param array $tags Tags array
* @param int $specificLifetime If != false, set a specific lifetime for this cache record (null => infinite lifetime)
* @param string $forcedDatas If not null, force written datas with this
* @param boolean $echoData If set to true, datas are sent to the browser
* @param int $priority integer between 0 (very low priority) and 10 (maximum priority) used by some particular backends
* @return void
*/
public function end($tags = array(), $specificLifetime = false, $forcedDatas = null, $echoData = true, $priority = 8)
{
if ($forcedDatas === null) {
$data = ob_get_clean();
} else {
$data =& $forcedDatas;
}
$id = array_pop($this->_idStack);
if ($id === null) {
Zend_Cache::throwException('use of end() without a start()');
}
$this->save($data, $id, $tags, $specificLifetime, $priority);
if ($echoData) {
echo($data);
}
}

}