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   /*
    * Copyright 2012 The Netty Project
    *
    * The Netty Project licenses this file to you under the Apache License,
    * version 2.0 (the "License"); you may not use this file except in compliance
    * with the License. You may obtain a copy of the License at:
    *
    *   https://www.apache.org/licenses/LICENSE-2.0
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
   * License for the specific language governing permissions and limitations
   * under the License.
   */
  package io.netty.example.worldclock;
  
  import io.netty.channel.ChannelHandlerContext;
  import io.netty.channel.SimpleChannelInboundHandler;
  import io.netty.example.worldclock.WorldClockProtocol.Continent;
  import io.netty.example.worldclock.WorldClockProtocol.DayOfWeek;
  import io.netty.example.worldclock.WorldClockProtocol.LocalTime;
  import io.netty.example.worldclock.WorldClockProtocol.LocalTimes;
  import io.netty.example.worldclock.WorldClockProtocol.Location;
  import io.netty.example.worldclock.WorldClockProtocol.Locations;
  
  import java.util.Calendar;
  import java.util.TimeZone;
  
  import static java.util.Calendar.*;
  
  public class WorldClockServerHandler extends SimpleChannelInboundHandler<Locations> {
  
      @Override
      public void channelRead0(ChannelHandlerContext ctx, Locations locations) throws Exception {
          long currentTime = System.currentTimeMillis();
  
          LocalTimes.Builder builder = LocalTimes.newBuilder();
          for (Location l: locations.getLocationList()) {
              TimeZone tz = TimeZone.getTimeZone(
                      toString(l.getContinent()) + '/' + l.getCity());
              Calendar calendar = getInstance(tz);
              calendar.setTimeInMillis(currentTime);
  
              builder.addLocalTime(LocalTime.newBuilder().
                      setYear(calendar.get(YEAR)).
                      setMonth(calendar.get(MONTH) + 1).
                      setDayOfMonth(calendar.get(DAY_OF_MONTH)).
                      setDayOfWeek(DayOfWeek.valueOf(calendar.get(DAY_OF_WEEK))).
                      setHour(calendar.get(HOUR_OF_DAY)).
                      setMinute(calendar.get(MINUTE)).
                      setSecond(calendar.get(SECOND)).build());
          }
  
          ctx.write(builder.build());
      }
  
      @Override
      public void channelReadComplete(ChannelHandlerContext ctx) {
          ctx.flush();
      }
  
      @Override
      public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
          cause.printStackTrace();
          ctx.close();
      }
  
      private static String toString(Continent c) {
          return c.name().charAt(0) + c.name().toLowerCase().substring(1);
      }
  }