added a sample Date type adapter for UTC
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/*
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* Copyright (C) 2011 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.gson.typeadapters;
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import java.io.IOException;
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import java.text.DateFormat;
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import java.text.ParseException;
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import java.text.SimpleDateFormat;
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import java.util.Date;
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import java.util.Locale;
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import java.util.TimeZone;
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import com.google.gson.JsonParseException;
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import com.google.gson.TypeAdapter;
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import com.google.gson.stream.JsonReader;
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import com.google.gson.stream.JsonWriter;
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public final class UtcDateTypeAdapter extends TypeAdapter<Date> {
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private final DateFormat iso8601Format;
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public UtcDateTypeAdapter() {
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this.iso8601Format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSXXX", Locale.US);
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this.iso8601Format.setTimeZone(TimeZone.getTimeZone("UTC"));
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}
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// These methods need to be synchronized since JDK DateFormat classes are not thread-safe
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// See issue 162
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@Override
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public synchronized void write(JsonWriter out, Date date) throws IOException {
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if (date == null) {
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out.nullValue();
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}
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out.value(iso8601Format.format(date));
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}
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// These methods need to be synchronized since JDK DateFormat classes are not thread-safe
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// See issue 162
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@Override
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public synchronized Date read(JsonReader in) throws IOException {
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try {
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switch (in.peek()) {
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case NULL: return null;
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default: return iso8601Format.parse(in.nextString());
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}
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} catch (ParseException e) {
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throw new JsonParseException(e);
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}
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}
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}
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@ -0,0 +1,50 @@
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/*
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* Copyright (C) 2011 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.gson.typeadapters;
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import java.util.Calendar;
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import java.util.Date;
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import java.util.TimeZone;
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import junit.framework.TestCase;
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import com.google.gson.Gson;
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import com.google.gson.GsonBuilder;
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public final class UtcDateTypeAdapterTest extends TestCase {
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private final Gson gson = new GsonBuilder()
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.registerTypeAdapter(Date.class, new UtcDateTypeAdapter())
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.create();
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public void testLocalTimeZone() {
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Date expected = new Date();
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String json = gson.toJson(expected);
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Date actual = gson.fromJson(json, Date.class);
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assertEquals(expected.getTime(), actual.getTime());
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}
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public void testDifferentTimeZones() {
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for (String timeZone : TimeZone.getAvailableIDs()) {
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Calendar cal = Calendar.getInstance(TimeZone.getTimeZone(timeZone));
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Date expected = cal.getTime();
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String json = gson.toJson(expected);
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// System.out.println(json + ": " + timeZone);
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Date actual = gson.fromJson(json, Date.class);
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assertEquals(expected.getTime(), actual.getTime());
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}
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}
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}
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