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<?php
/*
* This file is part of SwiftMailer.
* (c) 2004-2009 Chris Corbyn
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
/**
* Provides a mechanism for storing data using two keys.
*
* @author Chris Corbyn
*/
interface Swift_KeyCache
{
/** Mode for replacing existing cached data */
const MODE_WRITE = 1;
/** Mode for appending data to the end of existing cached data */
const MODE_APPEND = 2;
/**
* Set a string into the cache under $itemKey for the namespace $nsKey.
*
* @see MODE_WRITE, MODE_APPEND
*
* @param string $nsKey
* @param string $itemKey
* @param string $string
* @param int $mode
*/
public function setString($nsKey, $itemKey, $string, $mode);
/**
* Set a ByteStream into the cache under $itemKey for the namespace $nsKey.
*
* @see MODE_WRITE, MODE_APPEND
*
* @param string $nsKey
* @param string $itemKey
* @param Swift_OutputByteStream $os
* @param int $mode
*/
public function importFromByteStream($nsKey, $itemKey, Swift_OutputByteStream $os, $mode);
/**
* Provides a ByteStream which when written to, writes data to $itemKey.
*
* NOTE: The stream will always write in append mode.
* If the optional third parameter is passed all writes will go through $is.
*
* @param string $nsKey
* @param string $itemKey
* @param Swift_InputByteStream $is optional input stream
*
* @return Swift_InputByteStream
*/
public function getInputByteStream($nsKey, $itemKey, Swift_InputByteStream $is = null);
/**
* Get data back out of the cache as a string.
*
* @param string $nsKey
* @param string $itemKey
*
* @return string
*/
public function getString($nsKey, $itemKey);
/**
* Get data back out of the cache as a ByteStream.
*
* @param string $nsKey
* @param string $itemKey
* @param Swift_InputByteStream $is stream to write the data to
*/
public function exportToByteStream($nsKey, $itemKey, Swift_InputByteStream $is);
/**
* Check if the given $itemKey exists in the namespace $nsKey.
*
* @param string $nsKey
* @param string $itemKey
*
* @return bool
*/
public function hasKey($nsKey, $itemKey);
/**
* Clear data for $itemKey in the namespace $nsKey if it exists.
*
* @param string $nsKey
* @param string $itemKey
*/
public function clearKey($nsKey, $itemKey);
/**
* Clear all data in the namespace $nsKey if it exists.
*
* @param string $nsKey
*/
public function clearAll($nsKey);
}
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