晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/local/lsws/add-ons/webcachemgr/src/View/Model/VersionManageViewModel.php
<?php

/** ******************************************
 * LiteSpeed Web Server Cache Manager
 * @author: LiteSpeed Technologies, Inc. (https://www.litespeedtech.com)
 * @copyright: (c) 2018-2020
 * ******************************************* */

namespace Lsc\Wp\View\Model;

use \Lsc\Wp\WPInstallStorage;
use \Lsc\Wp\Context\Context;
use \Lsc\Wp\PluginVersion;
use \Lsc\Wp\Logger;
use \Lsc\Wp\LSCMException;

class VersionManageViewModel
{

    /**
     * @var string
     */
    const FLD_ICON = 'icon';

    /**
     * @var string
     */
    const FLD_VERSION_LIST = 'versionList';

    /**
     * @var string
     */
    const FLD_ALLOWED_VER_LIST = 'allowedList';

    /**
     * @var string
     */
    const FLD_ACTIVE_VER = 'activeVer';

    /**
     * @var string
     */
    const FLD_ERR_MSGS = 'errMsgs';

    /**
     * @var string
     */
    const FLD_STATE = 'state';

    /**
     * @var int
     */
    const ST_INSTALLS_DISCOVERED = 2;

    /**
     * @deprecated 1.13.4.1  Added back as a deprecated constant after accidental
     *                       removal in v1.13.4. Use
     *                       self::ST_NO_NON_ERROR_INSTALLS_DISCOVERED instead.
     * @var int
     */
    const ST_NO_INSTALLS_DISCOVERED = 1;

    /**
     * @var int
     */
    const ST_NO_NON_ERROR_INSTALLS_DISCOVERED = 1;

    /**
     * @var int
     */
    const ST_SCAN_NEEDED = 0;

    /**
     * @var WPInstallStorage
     */
    protected $wpInstallStorage;

    /**
     * @var (boolean|string|string[])[]
     */
    protected $tplData = array();

    /**
     *
     * @param WPInstallStorage  $wpInstallStorage
     * @throws LSCMException  Thrown indirectly.
     */
    public function __construct( WPInstallStorage $wpInstallStorage )
    {
        $this->wpInstallStorage = $wpInstallStorage;

        $this->init();
    }

    /**
     *
     * @throws LSCMException  Thrown indirectly.
     */
    protected function init()
    {
        $this->setIconPath();
        $this->setActiveVerData();
        $this->setVerListData();
        $this->setStateData();
        $this->setMsgData();
    }

    /**
     *
     * @param string  $field
     * @return null|boolean|string|string[]
     */
    public function getTplData( $field )
    {
        if ( !isset($this->tplData[$field]) ) {
            return null;
        }

        return $this->tplData[$field];

    }

    protected function setIconPath()
    {
        $iconPath = '';

        try
        {
            $iconDir = Context::getOption()->getIconDir();
            $iconPath = "{$iconDir}/lscwpCurrentVersion.svg";
        }
        catch ( LSCMException $e )
        {
            Logger::debug($e->getMessage() . ' Could not get icon directory.');
        }

        $this->tplData[self::FLD_ICON] = $iconPath;
    }

    protected function setActiveVerData()
    {
        try
        {
            $currVer = PluginVersion::getCurrentVersion();
        }
        catch ( LSCMException $e )
        {
            Logger::debug(
                $e->getMessage() . ' Could not get active LSCWP version.'
            );

            $currVer = false;
        }

        $this->tplData[self::FLD_ACTIVE_VER] = $currVer;
    }

    protected function setStateData()
    {
        if ( $this->wpInstallStorage->getError() == 0 ) {

            if ( $this->wpInstallStorage->getCount(true) > 0 ) {
                $this->tplData[self::FLD_STATE] = self::ST_INSTALLS_DISCOVERED;
            }
            else {
                $this->tplData[self::FLD_STATE] =
                    self::ST_NO_NON_ERROR_INSTALLS_DISCOVERED;
            }
        }
        else {
            $this->tplData[self::FLD_STATE] = self::ST_SCAN_NEEDED;
        }
    }

    /**
     *
     * @throws LSCMException  Thrown indirectly.
     */
    protected function setVerListData()
    {
        $vermgr = PluginVersion::getInstance();

        try
        {
            $verList = $vermgr->getShortVersions();
            $allowedList = $vermgr->getAllowedVersions();
        }
        catch ( LSCMException $e )
        {
            Logger::debug(
                $e->getMessage() . ' Could not retrieve version list.'
            );

            $verList = $allowedList = array();
        }

        $this->tplData[self::FLD_VERSION_LIST] = $verList;
        $this->tplData[self::FLD_ALLOWED_VER_LIST] = $allowedList;
    }

    protected function setMsgData()
    {
        $this->tplData[self::FLD_ERR_MSGS] = Logger::getUiMsgs(Logger::UI_ERR);
    }

    public function getTpl()
    {
        return Context::getOption()->getSharedTplDir() . '/VersionManage.tpl';
    }

}

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