DefaultDateTypeAdapter.java

package com.google.gson;

import java.lang.reflect.Type;
import java.sql.Timestamp;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Locale;
import java.util.TimeZone;

final class DefaultDateTypeAdapter
  implements JsonDeserializer<java.util.Date>, JsonSerializer<java.util.Date>
{
  private final DateFormat enUsFormat;
  private final DateFormat localFormat;
  private final DateFormat iso8601Format;

  DefaultDateTypeAdapter()
  {
    this(DateFormat.getDateTimeInstance(2, 2, Locale.US), DateFormat.getDateTimeInstance(2, 2));
  }

  DefaultDateTypeAdapter(String datePattern)
  {
    this(new SimpleDateFormat(datePattern, Locale.US), new SimpleDateFormat(datePattern));
  }

  public DefaultDateTypeAdapter(int dateStyle, int timeStyle)
  {
    this(DateFormat.getDateTimeInstance(dateStyle, timeStyle, Locale.US), DateFormat.getDateTimeInstance(dateStyle, timeStyle));
  }

  DefaultDateTypeAdapter(DateFormat enUsFormat, DateFormat localFormat)
  {
    this.enUsFormat = enUsFormat;
    this.localFormat = localFormat;
    this.iso8601Format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.US);
    this.iso8601Format.setTimeZone(TimeZone.getTimeZone("UTC"));
  }

  public JsonElement serialize(java.util.Date src, Type typeOfSrc, JsonSerializationContext context)
  {
    synchronized (this.localFormat) {
      String dateFormatAsString = this.enUsFormat.format(src);
      return new JsonPrimitive(dateFormatAsString);
    }
  }

  public java.util.Date deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException
  {
    if (!(json instanceof JsonPrimitive)) {
      throw new JsonParseException("The date should be a string value");
    }
    java.util.Date date = deserializeToDate(json);
    if (typeOfT == java.util.Date.class)
      return date;
    if (typeOfT == Timestamp.class)
      return new Timestamp(date.getTime());
    if (typeOfT == java.sql.Date.class) {
      return new java.sql.Date(date.getTime());
    }
    throw new IllegalArgumentException(getClass() + " cannot deserialize to " + typeOfT);
  }

  private java.util.Date deserializeToDate(JsonElement json)
  {
    synchronized (this.localFormat) {
      try {
        return this.localFormat.parse(json.getAsString());
      }
      catch (ParseException ignored) {
        try {
          return this.enUsFormat.parse(json.getAsString());
        }
        catch (ParseException ignored) {
          try {
            return this.iso8601Format.parse(json.getAsString());
          } catch (ParseException e) {
            throw new JsonSyntaxException(json.getAsString(), e);
          }
        }
      }
    }
  }

  public String toString() { StringBuilder sb = new StringBuilder();
    sb.append(DefaultDateTypeAdapter.class.getSimpleName());
    sb.append('(').append(this.localFormat.getClass().getSimpleName()).append(')');
    return sb.toString();
  }
}