--- /dev/null
+<?php
+
+/**
+ * @file
+ * Definition of Drush\Cache\FileCache.
+ */
+
+namespace Drush\Cache;
+
+/**
+ * Default cache implementation.
+ *
+ * This cache implementation uses plain text files
+ * containing serialized php to store cached data. Each cache bin corresponds
+ * to a directory by the same name.
+ */
+class FileCache implements CacheInterface {
+ const EXTENSION = '.cache';
+ protected $bin;
+
+ function __construct($bin) {
+ $this->bin = $bin;
+ $this->directory = $this->cacheDirectory();
+ }
+
+ /**
+ * Returns the cache directory for the given bin.
+ *
+ * @param string $bin
+ */
+ function cacheDirectory($bin = NULL) {
+ $bin = $bin ? $bin : $this->bin;
+ return drush_directory_cache($bin);
+ }
+
+ function get($cid) {
+ $cids = array($cid);
+ $cache = $this->getMultiple($cids);
+ return reset($cache);
+ }
+
+ function getMultiple(&$cids) {
+ try {
+ $cache = array();
+ foreach ($cids as $cid) {
+ $filename = $this->getFilePath($cid);
+ if (!file_exists($filename)) throw new \Exception;
+
+ $item = $this->readFile($filename);
+ if ($item) {
+ $cache[$cid] = $item;
+ }
+ }
+ $cids = array_diff($cids, array_keys($cache));
+ return $cache;
+ }
+ catch (\Exception $e) {
+ return array();
+ }
+ }
+
+ /**
+ * Returns the contents of the given filename unserialized.
+ *
+ * @param string $filename
+ * Absolute path to filename to read contents from.
+ */
+ function readFile($filename) {
+ $item = file_get_contents($filename);
+ return $item ? unserialize($item) : FALSE;
+ }
+
+ function set($cid, $data, $expire = DRUSH_CACHE_PERMANENT) {
+ $created = time();
+
+ $cache = new \stdClass;
+ $cache->cid = $cid;
+ $cache->data = is_object($data) ? clone $data : $data;
+ $cache->created = $created;
+ if ($expire == DRUSH_CACHE_TEMPORARY) {
+ $cache->expire = $created + 2591999;
+ }
+ // Expire time is in seconds if less than 30 days, otherwise is a timestamp.
+ elseif ($expire != DRUSH_CACHE_PERMANENT && $expire < 2592000) {
+ $cache->expire = $created + $expire;
+ }
+ else {
+ $cache->expire = $expire;
+ }
+
+ // Ensure the cache directory still exists, in case a backend process
+ // cleared the cache after the cache was initialized.
+ drush_mkdir($this->directory);
+
+ $filename = $this->getFilePath($cid);
+ return $this->writeFile($filename, $cache);
+ }
+
+ /**
+ * Serializes data and write it to the given filename.
+ *
+ * @param string $filename
+ * Absolute path to filename to write cache data.
+ * @param $cache
+ * Cache data to serialize and write to $filename.
+ */
+ function writeFile($filename, $cache) {
+ return file_put_contents($filename, serialize($cache));
+ }
+
+ function clear($cid = NULL, $wildcard = FALSE) {
+ $bin_dir = $this->cacheDirectory();
+ $files = array();
+ if (empty($cid)) {
+ drush_delete_dir($bin_dir, TRUE);
+ }
+ else {
+ if ($wildcard) {
+ if ($cid == '*') {
+ drush_delete_dir($bin_dir, TRUE);
+ }
+ else {
+ $matches = drush_scan_directory($bin_dir, "/^$cid/", array('.', '..'));
+ $files = $files + array_keys($matches);
+ }
+ }
+ else {
+ $files[] = $this->getFilePath($cid);
+ }
+
+ foreach ($files as $f) {
+ if (file_exists($f)) {
+ unlink($f);
+ }
+ }
+ }
+ }
+
+ function isEmpty() {
+ $files = drush_scan_directory($this->directory, "//", array('.', '..'));
+ return empty($files);
+ }
+
+ /**
+ * Converts a cache id to a full path.
+ *
+ * @param $cid
+ * The cache ID of the data to retrieve.
+ *
+ * @return
+ * The full path to the cache file.
+ */
+ protected function getFilePath($cid) {
+ return $this->directory . '/' . str_replace(array(':'), '.', $cid) . self::EXTENSION;
+ }
+}