5187808233
* Enable additional Error Prone checks & fix violations Some of them also enforce additional Google Java Format requirements which are not handled by google-java-format, such as disallowing wildcard imports. Not all experimental checks have been listed because some are not applicable, such as Dependency Injection framework checks, or checks related to Guava's immutable collections (since Gson's main code does not have a dependency on Guava). Other checks have been omitted because they are probably not relevant (this was a subjective choice), or would require larger refactoring or would flag issues with the public API, which cannot be changed easily. * Address review feedback --------- Co-authored-by: Éamonn McManus <emcmanus@google.com>
180 lines
6.0 KiB
Java
180 lines
6.0 KiB
Java
/*
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* Copyright (C) 2008 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;
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import static com.google.common.truth.Truth.assertThat;
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import static org.junit.Assert.fail;
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import java.lang.reflect.Type;
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import java.math.BigInteger;
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import java.util.concurrent.atomic.AtomicInteger;
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import java.util.concurrent.atomic.AtomicLong;
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import org.junit.Before;
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import org.junit.Test;
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/**
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* Contains numerous tests involving registered type converters with a Gson instance.
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*
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* @author Inderjeet Singh
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* @author Joel Leitch
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*/
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public class GsonTypeAdapterTest {
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private Gson gson;
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@Before
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public void setUp() throws Exception {
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gson =
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new GsonBuilder()
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.registerTypeAdapter(AtomicLong.class, new ExceptionTypeAdapter())
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.registerTypeAdapter(AtomicInteger.class, new AtomicIntegerTypeAdapter())
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.create();
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}
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@Test
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public void testDefaultTypeAdapterThrowsParseException() throws Exception {
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try {
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gson.fromJson("{\"abc\":123}", BigInteger.class);
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fail("Should have thrown a JsonParseException");
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} catch (JsonParseException expected) {
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}
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}
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@Test
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public void testTypeAdapterThrowsException() throws Exception {
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try {
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gson.toJson(new AtomicLong(0));
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fail("Type Adapter should have thrown an exception");
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} catch (IllegalStateException expected) {
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}
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// Verify that serializer is made null-safe, i.e. it is not called for null
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assertThat(gson.toJson(null, AtomicLong.class)).isEqualTo("null");
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try {
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gson.fromJson("123", AtomicLong.class);
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fail("Type Adapter should have thrown an exception");
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} catch (JsonParseException expected) {
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}
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// Verify that deserializer is made null-safe, i.e. it is not called for null
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assertThat(gson.fromJson(JsonNull.INSTANCE, AtomicLong.class)).isNull();
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}
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@Test
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public void testTypeAdapterProperlyConvertsTypes() {
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int intialValue = 1;
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AtomicInteger atomicInt = new AtomicInteger(intialValue);
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String json = gson.toJson(atomicInt);
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assertThat(Integer.parseInt(json)).isEqualTo(intialValue + 1);
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atomicInt = gson.fromJson(json, AtomicInteger.class);
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assertThat(atomicInt.get()).isEqualTo(intialValue);
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}
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@Test
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public void testTypeAdapterDoesNotAffectNonAdaptedTypes() {
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String expected = "blah";
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String actual = gson.toJson(expected);
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assertThat(actual).isEqualTo("\"" + expected + "\"");
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actual = gson.fromJson(actual, String.class);
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assertThat(actual).isEqualTo(expected);
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}
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private static class ExceptionTypeAdapter
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implements JsonSerializer<AtomicLong>, JsonDeserializer<AtomicLong> {
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@Override
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public JsonElement serialize(AtomicLong src, Type typeOfSrc, JsonSerializationContext context) {
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throw new IllegalStateException();
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}
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@Override
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public AtomicLong deserialize(
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JsonElement json, Type typeOfT, JsonDeserializationContext context)
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throws JsonParseException {
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throw new IllegalStateException();
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}
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}
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private static class AtomicIntegerTypeAdapter
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implements JsonSerializer<AtomicInteger>, JsonDeserializer<AtomicInteger> {
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@Override
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public JsonElement serialize(
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AtomicInteger src, Type typeOfSrc, JsonSerializationContext context) {
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return new JsonPrimitive(src.incrementAndGet());
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}
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@Override
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public AtomicInteger deserialize(
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JsonElement json, Type typeOfT, JsonDeserializationContext context)
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throws JsonParseException {
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int intValue = json.getAsInt();
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return new AtomicInteger(--intValue);
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}
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}
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abstract static class Abstract {
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String a;
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}
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static class Concrete extends Abstract {
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String b;
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}
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// https://groups.google.com/d/topic/google-gson/EBmOCa8kJPE/discussion
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@Test
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public void testDeserializerForAbstractClass() {
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Concrete instance = new Concrete();
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instance.a = "android";
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instance.b = "beep";
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assertSerialized("{\"a\":\"android\"}", Abstract.class, true, true, instance);
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assertSerialized("{\"a\":\"android\"}", Abstract.class, true, false, instance);
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assertSerialized("{\"a\":\"android\"}", Abstract.class, false, true, instance);
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assertSerialized("{\"a\":\"android\"}", Abstract.class, false, false, instance);
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assertSerialized("{\"b\":\"beep\",\"a\":\"android\"}", Concrete.class, true, true, instance);
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assertSerialized("{\"b\":\"beep\",\"a\":\"android\"}", Concrete.class, true, false, instance);
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assertSerialized("{\"b\":\"beep\",\"a\":\"android\"}", Concrete.class, false, true, instance);
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assertSerialized("{\"b\":\"beep\",\"a\":\"android\"}", Concrete.class, false, false, instance);
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}
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private static void assertSerialized(
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String expected,
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Class<?> instanceType,
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boolean registerAbstractDeserializer,
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boolean registerAbstractHierarchyDeserializer,
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Object instance) {
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JsonDeserializer<Abstract> deserializer =
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new JsonDeserializer<Abstract>() {
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@Override
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public Abstract deserialize(
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JsonElement json, Type typeOfT, JsonDeserializationContext context)
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throws JsonParseException {
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throw new AssertionError();
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}
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};
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GsonBuilder builder = new GsonBuilder();
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if (registerAbstractDeserializer) {
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builder.registerTypeAdapter(Abstract.class, deserializer);
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}
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if (registerAbstractHierarchyDeserializer) {
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builder.registerTypeHierarchyAdapter(Abstract.class, deserializer);
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}
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Gson gson = builder.create();
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assertThat(gson.toJson(instance, instanceType)).isEqualTo(expected);
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}
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}
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