TimeZoneService.java

package com.aperture_software.glados_wiki.services;

import com.aperture_software.glados_wiki.entities.User;
import com.google.common.base.Optional;
import com.google.common.base.Strings;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.annotation.CacheEvict;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Service;

import java.util.*;

/**
 * Created by jhyun on 14. 1. 4.
 */
@Service
public class TimeZoneService {

    private static Logger LOG = LoggerFactory.getLogger(TimeZoneService.class);

    @Autowired
    private UserService userService;

    public TimeZone getDefaultTimeZone() {
        return TimeZone.getDefault();
    }

    @Cacheable(value = "UserTimeZones", key = "#p0")
    public TimeZone getTimeZoneByUsername(final String username) {
        TimeZone tz = getDefaultTimeZone();
        Optional<User> u = userService.getByUsername(username);
        if (u.isPresent() && !Strings.isNullOrEmpty(u.get().getTimezone())) {
            tz = TimeZone.getTimeZone(u.get().getTimezone());
            LOG.debug(String.format("USER [%s] -> TIMEZONE [%s]", username, tz));
        }
        return tz;
    }

    @CacheEvict(value = "UserTimeZones", key = "#p0")
    public void evictUserTimeZoneCache(final String username) {
        // NOTE: DO-NOTHING.
    }

    private static List<String> _sortedTimeZoneIds = null;

    public List<String> sortedTimeZoneIds() {
        if (_sortedTimeZoneIds == null) {
            _sortedTimeZoneIds = new ArrayList<String>(Arrays.asList(TimeZone.getAvailableIDs()));
            Collections.sort(_sortedTimeZoneIds);
        }
        //
        return _sortedTimeZoneIds;
    }


}