| /* |
| * 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 com.google.gson.internal.bind; |
| |
| import com.google.gson.Gson; |
| import com.google.gson.JsonSyntaxException; |
| import com.google.gson.TypeAdapter; |
| import com.google.gson.TypeAdapterFactory; |
| import com.google.gson.reflect.TypeToken; |
| import com.google.gson.stream.JsonReader; |
| import com.google.gson.stream.JsonToken; |
| import com.google.gson.stream.JsonWriter; |
| import java.io.IOException; |
| import java.text.DateFormat; |
| import java.text.ParseException; |
| import java.text.SimpleDateFormat; |
| import java.util.Date; |
| import java.util.Locale; |
| import java.util.TimeZone; |
| |
| /** |
| * Adapter for 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 DateTypeAdapter extends TypeAdapter<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() == Date.class ? (TypeAdapter<T>) new DateTypeAdapter() : null; |
| } |
| }; |
| |
| private final DateFormat enUsFormat |
| = DateFormat.getDateTimeInstance(DateFormat.DEFAULT, DateFormat.DEFAULT, Locale.US); |
| private final DateFormat localFormat |
| = DateFormat.getDateTimeInstance(DateFormat.DEFAULT, DateFormat.DEFAULT); |
| private final DateFormat iso8601Format = buildIso8601Format(); |
| |
| private static DateFormat buildIso8601Format() { |
| DateFormat iso8601Format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.US); |
| iso8601Format.setTimeZone(TimeZone.getTimeZone("UTC")); |
| return iso8601Format; |
| } |
| |
| @Override public Date read(JsonReader in) throws IOException { |
| if (in.peek() == JsonToken.NULL) { |
| in.nextNull(); |
| return null; |
| } |
| return deserializeToDate(in.nextString()); |
| } |
| |
| private synchronized Date deserializeToDate(String json) { |
| try { |
| return localFormat.parse(json); |
| } catch (ParseException ignored) { |
| } |
| try { |
| return enUsFormat.parse(json); |
| } catch (ParseException ignored) { |
| } |
| try { |
| return iso8601Format.parse(json); |
| } catch (ParseException e) { |
| throw new JsonSyntaxException(json, e); |
| } |
| } |
| |
| @Override public synchronized void write(JsonWriter out, Date value) throws IOException { |
| if (value == null) { |
| out.nullValue(); |
| return; |
| } |
| String dateFormatAsString = enUsFormat.format(value); |
| out.value(dateFormatAsString); |
| } |
| } |