code: /*
   * Copyright (C) 2011 Google Inc.
   *
   * Licensed 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
   *
   * http://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 tools.com.google.gson.internal.bind;
  
  import tools.com.google.gson.Gson;
  import tools.com.google.gson.JsonSyntaxException;
  import tools.com.google.gson.TypeAdapter;
  import tools.com.google.gson.TypeAdapterFactory;
  import tools.com.google.gson.reflect.TypeToken;
  import tools.com.google.gson.stream.JsonReader;
  import tools.com.google.gson.stream.JsonToken;
  import tools.com.google.gson.stream.JsonWriter;
  import java.io.IOException;
  import java.text.DateFormat;
  import java.text.ParseException;
  import java.text.SimpleDateFormat;
  
  /**
   * Adapter for java.sql.Date. Although this class appears stateless, it is not.
   * DateFormat captures its time zone and locale when it is created, which gives
   * this class state. DateFormat isn't thread safe either, so this class has
   * to synchronize its read and write methods.
   */
  public final class SqlDateTypeAdapter extends TypeAdapter<java.sql.Date> {
    public static final TypeAdapterFactory FACTORY = new TypeAdapterFactory() {
      @SuppressWarnings("unchecked") // we use a runtime check to make sure the 'T's equal
      @Override public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> typeToken) {
        return typeToken.getRawType() == java.sql.Date.class
            ? (TypeAdapter<T>) new SqlDateTypeAdapter() : null;
      }
    };
  
    private final DateFormat format = new SimpleDateFormat("MMM d, yyyy");
  
    @Override
    public synchronized java.sql.Date read(JsonReader in) throws IOException {
      if (in.peek() == JsonToken.NULL) {
        in.nextNull();
        return null;
      }
      try {
        final long utilDate = format.parse(in.nextString()).getTime();
        return new java.sql.Date(utilDate);
      } catch (ParseException e) {
        throw new JsonSyntaxException(e);
      }
    }
  
    @Override
    public synchronized void write(JsonWriter out, java.sql.Date value) throws IOException {
      out.value(value == null ? null : format.format(value));
    }
  }
  