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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.
+ */
+
+//@require 'Swift/KeyCache.php';
+//@require 'Swift/KeyCacheInputStream.php';
+//@require 'Swift/InputByteStream.php';
+//@require 'Swift/OutputByteStrean.php';
+//@require 'Swift/SwiftException.php';
+
+/**
+ * A basic KeyCache backed by an array.
+ * @package Swift
+ * @subpackage KeyCache
+ * @author Chris Corbyn
+ */
+class Swift_KeyCache_ArrayKeyCache implements Swift_KeyCache
+{
+
+ /**
+ * Cache contents.
+ * @var array
+ * @access private
+ */
+ private $_contents = array();
+
+ /**
+ * An InputStream for cloning.
+ * @var Swift_KeyCache_KeyCacheInputStream
+ * @access private
+ */
+ private $_stream;
+
+ /**
+ * Create a new ArrayKeyCache with the given $stream for cloning to make
+ * InputByteStreams.
+ * @param Swift_KeyCache_KeyCacheInputStream $stream
+ */
+ public function __construct(Swift_KeyCache_KeyCacheInputStream $stream)
+ {
+ $this->_stream = $stream;
+ }
+
+ /**
+ * Set a string into the cache under $itemKey for the namespace $nsKey.
+ * @param string $nsKey
+ * @param string $itemKey
+ * @param string $string
+ * @param int $mode
+ * @see MODE_WRITE, MODE_APPEND
+ */
+ public function setString($nsKey, $itemKey, $string, $mode)
+ {
+ $this->_prepareCache($nsKey);
+ switch ($mode)
+ {
+ case self::MODE_WRITE:
+ $this->_contents[$nsKey][$itemKey] = $string;
+ break;
+ case self::MODE_APPEND:
+ if (!$this->hasKey($nsKey, $itemKey))
+ {
+ $this->_contents[$nsKey][$itemKey] = '';
+ }
+ $this->_contents[$nsKey][$itemKey] .= $string;
+ break;
+ default:
+ throw new Swift_SwiftException(
+ 'Invalid mode [' . $mode . '] used to set nsKey='.
+ $nsKey . ', itemKey=' . $itemKey
+ );
+ }
+ }
+
+ /**
+ * Set a ByteStream into the cache under $itemKey for the namespace $nsKey.
+ * @param string $nsKey
+ * @param string $itemKey
+ * @param Swift_OutputByteStream $os
+ * @param int $mode
+ * @see MODE_WRITE, MODE_APPEND
+ */
+ public function importFromByteStream($nsKey, $itemKey, Swift_OutputByteStream $os,
+ $mode)
+ {
+ $this->_prepareCache($nsKey);
+ switch ($mode)
+ {
+ case self::MODE_WRITE:
+ $this->clearKey($nsKey, $itemKey);
+ case self::MODE_APPEND:
+ if (!$this->hasKey($nsKey, $itemKey))
+ {
+ $this->_contents[$nsKey][$itemKey] = '';
+ }
+ while (false !== $bytes = $os->read(8192))
+ {
+ $this->_contents[$nsKey][$itemKey] .= $bytes;
+ }
+ break;
+ default:
+ throw new Swift_SwiftException(
+ 'Invalid mode [' . $mode . '] used to set nsKey='.
+ $nsKey . ', itemKey=' . $itemKey
+ );
+ }
+ }
+
+ /**
+ * Provides a ByteStream which when written to, writes data to $itemKey.
+ * NOTE: The stream will always write in append mode.
+ * @param string $nsKey
+ * @param string $itemKey
+ * @return Swift_InputByteStream
+ */
+ public function getInputByteStream($nsKey, $itemKey,
+ Swift_InputByteStream $writeThrough = null)
+ {
+ $is = clone $this->_stream;
+ $is->setKeyCache($this);
+ $is->setNsKey($nsKey);
+ $is->setItemKey($itemKey);
+ if (isset($writeThrough))
+ {
+ $is->setWriteThroughStream($writeThrough);
+ }
+ return $is;
+ }
+
+ /**
+ * Get data back out of the cache as a string.
+ * @param string $nsKey
+ * @param string $itemKey
+ * @return string
+ */
+ public function getString($nsKey, $itemKey)
+ {
+ $this->_prepareCache($nsKey);
+ if ($this->hasKey($nsKey, $itemKey))
+ {
+ return $this->_contents[$nsKey][$itemKey];
+ }
+ }
+
+ /**
+ * Get data back out of the cache as a ByteStream.
+ * @param string $nsKey
+ * @param string $itemKey
+ * @param Swift_InputByteStream $is to write the data to
+ */
+ public function exportToByteStream($nsKey, $itemKey, Swift_InputByteStream $is)
+ {
+ $this->_prepareCache($nsKey);
+ $is->write($this->getString($nsKey, $itemKey));
+ }
+
+ /**
+ * Check if the given $itemKey exists in the namespace $nsKey.
+ * @param string $nsKey
+ * @param string $itemKey
+ * @return boolean
+ */
+ public function hasKey($nsKey, $itemKey)
+ {
+ $this->_prepareCache($nsKey);
+ return array_key_exists($itemKey, $this->_contents[$nsKey]);
+ }
+
+ /**
+ * Clear data for $itemKey in the namespace $nsKey if it exists.
+ * @param string $nsKey
+ * @param string $itemKey
+ */
+ public function clearKey($nsKey, $itemKey)
+ {
+ unset($this->_contents[$nsKey][$itemKey]);
+ }
+
+ /**
+ * Clear all data in the namespace $nsKey if it exists.
+ * @param string $nsKey
+ */
+ public function clearAll($nsKey)
+ {
+ unset($this->_contents[$nsKey]);
+ }
+
+ // -- Private methods
+
+ /**
+ * Initialize the namespace of $nsKey if needed.
+ * @param string $nsKey
+ * @access private
+ */
+ private function _prepareCache($nsKey)
+ {
+ if (!array_key_exists($nsKey, $this->_contents))
+ {
+ $this->_contents[$nsKey] = array();
+ }
+ }
+
+}