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/usr/share/php/Horde/Service/Weather/Alerts/WeatherUnderground.php is in php-horde-service-weather 2.5.4-1ubuntu1.

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<?php
/**
 * This file contains the Horde_Service_Weather_Alerts class for abstracting
 * access to weather alerts from Wunderground.
 *
 * Copyright 2011-2017 Horde LLC (http://www.horde.org/)
 *
 * @author   Michael J Rubinsky <mrubinsk@horde.org>
 * @license  http://www.horde.org/licenses/bsd BSD
 * @category Horde
 * @package  Service_Weather
 */

/**
 * Horde_Service_Weather_Alerts_WeatherUnderground class
 *
 * @author   Michael J Rubinsky <mrubinsk@horde.org>
 * @category Horde
 * @package  Service_Weather
 */
 class Horde_Service_Weather_Alerts_WeatherUnderground extends Horde_Service_Weather_Alerts_Base
 {

    public function __construct($properties, Horde_Service_Weather_Base $weather)
    {
        parent::__construct($properties, $weather);
        $this->_parse();
    }

    protected function _parse()
    {
        $this->_parsedAlerts = array();
        foreach ($this->_properties as $alert) {
            try {
                $date = new Horde_Date($alert->date_epoch, 'UTC');
            } catch (Horde_Date_Exception $e) {
                try {
                    $date = new Horde_Date($alert->date);
                } catch (Horde_Date_Exception $e) {
                    $date = null;
                }
            }
            try {
                $expires = new Horde_Date($alert->expires_epoch, 'UTC');
            } catch (Horde_Date_Exception $e) {
                try {
                    $expires = new Horde_Date($alert->expires);
                } catch (Horde_Date_Exception $e) {
                    $expires = null;
                }
            }
            $description = trim($alert->description);
            $meteo_name = trim($alert->wtype_meteo_name);
            $alert = array(
                'type' => empty($this->_typeMap[$alert->type])
                    ? ''
                    : $this->_typeMap[$alert->type],
                'desc' => $description ?: ($meteo_name ?: ''),
                // Euro only returns this, not epoch, but it's in UTC.
                'date_text' => $alert->date,
                'date' => $date,
                'expires_text' => $alert->expires,
                'expires' => $expires,
                // 'tz' => $alert->tz_long, //@todo - needed??
                'body' => trim($alert->message),
                // @todo This is available here: http://www.nws.noaa.gov/os/vtec/
                // but probably not needed, since 'description' looks like it
                // contains a sort-of-mapping already.
                //'phenomena' => $alert->phenomena
                'significance_text' => (!empty($this->_significanceMap[$alert->significance]) ? $this->_significanceMap[$alert->significance] : ''),
                'significance' => $alert->significance,
            );
            $this->_parsedAlerts[] = $alert;
        }
    }

 }