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diff --git a/management-interface/lib/db/jig.php b/management-interface/lib/db/jig.php
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+++ b/management-interface/lib/db/jig.php
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+<?php
+
+/*
+	Copyright (c) 2009-2014 F3::Factory/Bong Cosca, All rights reserved.
+
+	This file is part of the Fat-Free Framework (http://fatfree.sf.net).
+
+	THE SOFTWARE AND DOCUMENTATION ARE PROVIDED "AS IS" WITHOUT WARRANTY OF
+	ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+	IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR
+	PURPOSE.
+
+	Please see the license.txt file for more information.
+*/
+
+namespace DB;
+
+//! Flat-file DB wrapper
+class Jig {
+
+	//@{ Storage formats
+	const
+		FORMAT_JSON=0,
+		FORMAT_Serialized=1;
+	//@}
+
+	protected
+		//! UUID
+		$uuid,
+		//! Storage location
+		$dir,
+		//! Current storage format
+		$format,
+		//! Jig log
+		$log;
+
+	/**
+	*	Read data from file
+	*	@return array
+	*	@param $file string
+	**/
+	function read($file) {
+		$fw=\Base::instance();
+		if (!is_file($dst=$this->dir.$file))
+			return array();
+		$raw=$fw->read($dst);
+		switch ($this->format) {
+			case self::FORMAT_JSON:
+				$data=json_decode($raw,TRUE);
+				break;
+			case self::FORMAT_Serialized:
+				$data=$fw->unserialize($raw);
+				break;
+		}
+		return $data;
+	}
+
+	/**
+	*	Write data to file
+	*	@return int
+	*	@param $file string
+	*	@param $data array
+	**/
+	function write($file,array $data=NULL) {
+		$fw=\Base::instance();
+		switch ($this->format) {
+			case self::FORMAT_JSON:
+				$out=json_encode($data,@constant('JSON_PRETTY_PRINT'));
+				break;
+			case self::FORMAT_Serialized:
+				$out=$fw->serialize($data);
+				break;
+		}
+		return $fw->write($this->dir.$file,$out);
+	}
+
+	/**
+	*	Return directory
+	*	@return string
+	**/
+	function dir() {
+		return $this->dir;
+	}
+
+	/**
+	*	Return UUID
+	*	@return string
+	**/
+	function uuid() {
+		return $this->uuid;
+	}
+
+	/**
+	*	Return SQL profiler results
+	*	@return string
+	**/
+	function log() {
+		return $this->log;
+	}
+
+	/**
+	*	Jot down log entry
+	*	@return NULL
+	*	@param $frame string
+	**/
+	function jot($frame) {
+		if ($frame)
+			$this->log.=date('r').' '.$frame.PHP_EOL;
+	}
+
+	/**
+	*	Clean storage
+	*	@return NULL
+	**/
+	function drop() {
+		if ($glob=@glob($this->dir.'/*',GLOB_NOSORT))
+			foreach ($glob as $file)
+				@unlink($file);
+	}
+
+	/**
+	*	Instantiate class
+	*	@param $dir string
+	*	@param $format int
+	**/
+	function __construct($dir,$format=self::FORMAT_JSON) {
+		if (!is_dir($dir))
+			mkdir($dir,\Base::MODE,TRUE);
+		$this->uuid=\Base::instance()->hash($this->dir=$dir);
+		$this->format=$format;
+	}
+
+}