<?php
// +----------------------------------------------------------------------
// | ThinkCache
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2012 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------

namespace Think\Cache\Driver;

/**
 * 文件类型缓存类
 * @author    liu21st <liu21st@gmail.com>
 */
class Simple {

    protected $options  =   [
        'prefix'        =>  '',
        'temp'          =>  '',
    ];

    /**
     * 架构函数
     * @access public
     */
    public function __construct($options=[]) {
        if(!empty($options)) {
            $this->options =  array_merge($this->options,$options);
        }
        if(substr($this->options['temp'], -1) != '/')    $this->options['temp'] .= '/';
    }

    /**
     * 取得变量的存储文件名
     * @access private
     * @param string $name 缓存变量名
     * @return string
     */
    private function filename($name) {
        return  $this->options['temp'].$this->options['prefix'].md5($name).'.php';
    }

    /**
     * 读取缓存
     * @access public
     * @param string $name 缓存变量名
     * @return mixed
     */
    public function get($name) {
        $filename       = $this->filename($name);
        if (is_file($filename)) {
            return include $filename;
        }else{
            return false;
        }
    }

    /**
     * 写入缓存
     * @access public
     * @param string $name 缓存变量名
     * @param mixed $value  存储数据
     * @param int $expire  有效时间 0为永久
     * @return boolen
     */
    public function set($name,$value,$expire=null) {
        $filename       = $this->filename($name);
        // 缓存数据
        $dir            =   dirname($filename);
        // 目录不存在则创建
        //if (!is_dir($dir))
          //  mkdir($dir,0755,true);
        return file_put_contents($filename, ("<?php\treturn " . var_export($value, true) . ";?>"));
    }

    /**
     * 删除缓存
     * @access public
     * @param string $name 缓存变量名
     * @return boolen
     */
    public function rm($name) {
        return unlink($this->filename($name));
    }

    /**
     * 清除缓存
     * @access public
     * @param string $name 缓存变量名
     * @return boolen
     */
    public function clear() {
        $filename       = $this->filename('*');
        array_map("unlink", glob($filename));
    }
}