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