public function __construct($path,$content)
{
    $this->path=strtr($path,array('/'=>DIRECTORY_SEPARATOR,'\\'=>DIRECTORY_SEPARATOR));
    $this->content=$content;
    if(is_file($path))
        $this->operation=file_get_contents($path)===$content ? self::OP_SKIP : self::OP_OVERWRITE;
    elseif($content===null)  // is dir
        $this->operation=is_dir($path) ? self::OP_SKIP : self::OP_NEW;
    else
        $this->operation=self::OP_NEW;
}

public function getRelativePath()
{
    if(strpos($this->path,Yii::app()->basePath)===0)
        return substr($this->path,strlen(Yii::app()->basePath)+1);
    else
        return $this->path;
}

public function getType()
{
    if(($pos=strrpos($this->path,'.'))!==false)
        return substr($this->path,$pos+1);
    else
        return 'unknown';
}

public function save()
{
    $module=Yii::app()->controller->module;
    if($this->content===null)  // a directory
    {
        if(!is_dir($this->path))
        {
            $oldmask=@umask(0);
            $result=@mkdir($this->path,$module->newDirMode,true);
            @umask($oldmask);
            if(!$result)
            {
                $this->error="Unable to create the directory '{$this->path}'.";
                return false;
            }
        }
        return true;
    }

    if($this->operation===self::OP_NEW)
    {
        $dir=dirname($this->path);
        if(!is_dir($dir))
        {
            $oldmask=@umask(0);
            $result=@mkdir($dir,$module->newDirMode,true);
            @umask($oldmask);
            if(!$result)
            {
                $this->error="Unable to create the directory '$dir'.";
                return false;
            }
        }
    }
    if(@file_put_contents($this->path,$this->content)===false)
    {
        $this->error="Unable to write the file '{$this->path}'.";
        return false;
    }
    else
    {
        $oldmask=@umask(0);
        @chmod($this->path,$module->newFileMode);
        @umask($oldmask);
    }
    return true;
}