2 * Copyright (C) 2011 Google Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 package com
.google
.gson
.internal
.bind
;
19 import com
.google
.gson
.Gson
;
20 import com
.google
.gson
.JsonSyntaxException
;
21 import com
.google
.gson
.TypeAdapter
;
22 import com
.google
.gson
.TypeAdapterFactory
;
23 import com
.google
.gson
.reflect
.TypeToken
;
24 import com
.google
.gson
.stream
.JsonReader
;
25 import com
.google
.gson
.stream
.JsonToken
;
26 import com
.google
.gson
.stream
.JsonWriter
;
27 import java
.io
.IOException
;
28 import java
.text
.DateFormat
;
29 import java
.text
.ParseException
;
30 import java
.text
.SimpleDateFormat
;
31 import java
.util
.Date
;
32 import java
.util
.Locale
;
33 import java
.util
.TimeZone
;
36 * Adapter for Date. Although this class appears stateless, it is not.
37 * DateFormat captures its time zone and locale when it is created, which gives
38 * this class state. DateFormat isn't thread safe either, so this class has
39 * to synchronize its read and write methods.
41 public final class DateTypeAdapter
extends TypeAdapter
<Date
> {
42 public static final TypeAdapterFactory FACTORY
= new TypeAdapterFactory() {
43 @SuppressWarnings("unchecked") // we use a runtime check to make sure the 'T's equal
44 public <T
> TypeAdapter
<T
> create(Gson gson
, TypeToken
<T
> typeToken
) {
45 return typeToken
.getRawType() == Date
.class ?
(TypeAdapter
<T
>) new DateTypeAdapter() : null;
49 private final DateFormat enUsFormat
50 = DateFormat
.getDateTimeInstance(DateFormat
.DEFAULT
, DateFormat
.DEFAULT
, Locale
.US
);
51 private final DateFormat localFormat
52 = DateFormat
.getDateTimeInstance(DateFormat
.DEFAULT
, DateFormat
.DEFAULT
);
53 private final DateFormat iso8601Format
= buildIso8601Format();
55 private static DateFormat
buildIso8601Format() {
56 DateFormat iso8601Format
= new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale
.US
);
57 iso8601Format
.setTimeZone(TimeZone
.getTimeZone("UTC"));
61 @Override public Date
read(JsonReader in
) throws IOException
{
62 if (in
.peek() == JsonToken
.NULL
) {
66 return deserializeToDate(in
.nextString());
69 private synchronized Date
deserializeToDate(String json
) {
71 return localFormat
.parse(json
);
72 } catch (ParseException ignored
) {
75 return enUsFormat
.parse(json
);
76 } catch (ParseException ignored
) {
79 return iso8601Format
.parse(json
);
80 } catch (ParseException e
) {
81 throw new JsonSyntaxException(json
, e
);
85 @Override public synchronized void write(JsonWriter out
, Date value
) throws IOException
{
90 String dateFormatAsString
= enUsFormat
.format(value
);
91 out
.value(dateFormatAsString
);