content: package com.alibaba.fastjson.serializer;
  
  import java.io.IOException;
  import java.lang.reflect.Type;
  import java.text.DateFormat;
  import java.text.SimpleDateFormat;
  import java.util.Calendar;
  import java.util.Date;
  import java.util.GregorianCalendar;
  
  import com.alibaba.fastjson.JSON;
  import com.alibaba.fastjson.parser.DefaultJSONParser;
  import com.alibaba.fastjson.parser.JSONLexer;
  import com.alibaba.fastjson.parser.JSONToken;
  import com.alibaba.fastjson.parser.deserializer.ContextObjectDeserializer;
  import com.alibaba.fastjson.parser.deserializer.ObjectDeserializer;
  import com.alibaba.fastjson.util.IOUtils;
  
  import javax.xml.datatype.DatatypeConfigurationException;
  import javax.xml.datatype.DatatypeFactory;
  import javax.xml.datatype.XMLGregorianCalendar;
  
  public class CalendarCodec extends ContextObjectDeserializer implements ObjectSerializer, ObjectDeserializer, ContextObjectSerializer {
  
      public final static CalendarCodec instance = new CalendarCodec();
  
      private DatatypeFactory dateFactory;
  
      public void write(JSONSerializer serializer, Object object, BeanContext context) throws IOException {
          SerializeWriter out = serializer.out;
          String format = context.getFormat();
          Calendar calendar = (Calendar) object;
  
          if (format.equals("unixtime")) {
              long seconds = calendar.getTimeInMillis() / 1000L;
              out.writeInt((int) seconds);
              return;
          }
  
          DateFormat dateFormat = new SimpleDateFormat(format);
          if (dateFormat == null) {
              dateFormat = new SimpleDateFormat(JSON.DEFFAULT_DATE_FORMAT, serializer.locale);
          }
          dateFormat.setTimeZone(serializer.timeZone);
          String text = dateFormat.format(calendar.getTime());
          out.writeString(text);
      }
  
  
      public void write(JSONSerializer serializer, Object object, Object fieldName, Type fieldType, int features)
                                                                                                                 throws IOException {
          SerializeWriter out = serializer.out;
  
          if (object == null) {
              out.writeNull();
              return;
          }
  
          Calendar calendar;
          if (object instanceof XMLGregorianCalendar) {
              calendar = ((XMLGregorianCalendar) object).toGregorianCalendar();
          } else {
              calendar = (Calendar) object;
          }
  
          if (out.isEnabled(SerializerFeature.UseISO8601DateFormat)) {
              final char quote = out.isEnabled(SerializerFeature.UseSingleQuotes) //
                  ? '\'' //
                  : '\"';
              out.append(quote);
  
              int year = calendar.get(Calendar.YEAR);
              int month = calendar.get(Calendar.MONTH) + 1;
              int day = calendar.get(Calendar.DAY_OF_MONTH);
              int hour = calendar.get(Calendar.HOUR_OF_DAY);
              int minute = calendar.get(Calendar.MINUTE);
              int second = calendar.get(Calendar.SECOND);
              int millis = calendar.get(Calendar.MILLISECOND);
  
              char[] buf;
              if (millis != 0) {
                  buf = "0000-00-00T00:00:00.000".toCharArray();
                  IOUtils.getChars(millis, 23, buf);
                  IOUtils.getChars(second, 19, buf);
                  IOUtils.getChars(minute, 16, buf);
                  IOUtils.getChars(hour, 13, buf);
                  IOUtils.getChars(day, 10, buf);
                  IOUtils.getChars(month, 7, buf);
                  IOUtils.getChars(year, 4, buf);
  
              } else {
                  if (second == 0 && minute == 0 && hour == 0) {
                      buf = "0000-00-00".toCharArray();
                      IOUtils.getChars(day, 10, buf);
                      IOUtils.getChars(month, 7, buf);
                      IOUtils.getChars(year, 4, buf);
                  } else {
                      buf = "0000-00-00T00:00:00".toCharArray();
                      IOUtils.getChars(second, 19, buf);
                      IOUtils.getChars(minute, 16, buf);
                      IOUtils.getChars(hour, 13, buf);
                      IOUtils.getChars(day, 10, buf);
                      IOUtils.getChars(month, 7, buf);
                      IOUtils.getChars(year, 4, buf);
                  }
              }
  
              out.write(buf);
  
              float timeZoneF = calendar.getTimeZone().getOffset(calendar.getTimeInMillis()) / (3600.0f * 1000);
              int timeZone = (int)timeZoneF;
              if (timeZone == 0.0) {
                  out.write('Z');
              } else {
                  if (timeZone > 9) {
                      out.write('+');
                      out.writeInt(timeZone);
                  } else if (timeZone > 0) {
                      out.write('+');
                      out.write('0');
                      out.writeInt(timeZone);
                  } else if (timeZone < -9) {
                      out.write('-');
                      out.writeInt(timeZone);
                  } else if (timeZone < 0) {
                      out.write('-');
                      out.write('0');
                      out.writeInt(-timeZone);
                  }
                  out.write(':');
                  // handles uneven timeZones 30 mins, 45 mins
                  // this would always be less than 60
                  int offSet = (int)((timeZoneF - timeZone) * 60);
                  out.append(String.format("%02d", offSet));
              }
  
              out.append(quote);
          } else {
              Date date = calendar.getTime();
              serializer.write(date);
          }
      }
  
      public <T> T deserialze(DefaultJSONParser parser, Type clazz, Object fieldName) {
          return deserialze(parser, clazz, fieldName, null, 0);
      }
  
      @Override
      @SuppressWarnings("unchecked")
      public <T> T deserialze(DefaultJSONParser parser, Type type, Object fieldName, String format, int features) {
          Object value = DateCodec.instance.deserialze(parser, type, fieldName, format, features);
  
          if (value instanceof Calendar) {
              return (T) value;
          }
  
          Date date = (Date) value;
          if (date == null) {
              return null;
          }
  
          JSONLexer lexer = parser.lexer;
          Calendar calendar = Calendar.getInstance(lexer.getTimeZone(), lexer.getLocale());
          calendar.setTime(date);
  
          if (type == XMLGregorianCalendar.class) {
              return (T) createXMLGregorianCalendar((GregorianCalendar) calendar);
          }
  
          return (T) calendar;
      }
  
      public XMLGregorianCalendar createXMLGregorianCalendar(Calendar calendar) {
          if (dateFactory == null) {
              try {
                  dateFactory = DatatypeFactory.newInstance();
              } catch (DatatypeConfigurationException e) {
                  throw new IllegalStateException("Could not obtain an instance of DatatypeFactory.", e);
              }
          }
          return dateFactory.newXMLGregorianCalendar((GregorianCalendar) calendar);
      }
  
      public int getFastMatchToken() {
          return JSONToken.LITERAL_INT;
      }
  }
  