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/*
* Copyright (C) 2016 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.regression;
import static org.junit.Assert.assertEquals;
import com.google.gson.Gson;
import com.google.gson.TypeAdapter;
import com.google.gson.TypeAdapterFactory;
import com.google.gson.annotations.JsonAdapter;
import com.google.gson.reflect.TypeToken;
import org.junit.Test;
public class JsonAdapterNullSafeTest {
private final Gson gson = new Gson();
@Test
public void testNullSafeBugSerialize() throws Exception {
Device device = new Device("ec57803e");
gson.toJson(device);
}
@Test
public void testNullSafeBugDeserialize() throws Exception {
Device device = gson.fromJson("{'id':'ec57803e2'}", Device.class);
assertEquals("ec57803e2", device.id);
}
@JsonAdapter(Device.JsonAdapterFactory.class)
private static final class Device {
String id;
Device(String id) {
this.id = id;
}
static final class JsonAdapterFactory implements TypeAdapterFactory {
// The recursiveCall in {@link Device.JsonAdapterFactory} is the source of this bug
// because we use it to return a null type adapter on a recursive call.
private static final ThreadLocal<Boolean> recursiveCall = new ThreadLocal<>();
@Override public <T> TypeAdapter<T> create(final Gson gson, TypeToken<T> type) {
if (type.getRawType() != Device.class || recursiveCall.get() != null) {
recursiveCall.set(null); // clear for subsequent use
return null;
}
recursiveCall.set(Boolean.TRUE);
return gson.getDelegateAdapter(this, type);
}
}
}
}
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