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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.functional;
import java.lang.reflect.Type;
import com.google.gson.Gson;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonParseException;
import com.google.gson.JsonPrimitive;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;
import com.google.gson.annotations.JsonAdapter;
import junit.framework.TestCase;
/**
* Functional tests for the {@link JsonAdapter} annotation on fields where the value is of
* type {@link JsonSerializer} or {@link JsonDeserializer}.
*/
public final class JsonAdapterSerializerDeserializerTest extends TestCase {
public void testJsonSerializerDeserializerBasedJsonAdapterOnFields() {
Gson gson = new Gson();
String json = gson.toJson(new Computer(new User("Inderjeet Singh"), null, new User("Jesse Wilson")));
assertEquals("{\"user1\":\"UserSerializer\",\"user3\":\"UserSerializerDeserializer\"}", json);
Computer computer = gson.fromJson("{'user2':'Jesse Wilson','user3':'Jake Wharton'}", Computer.class);
assertEquals("UserSerializer", computer.user2.name);
assertEquals("UserSerializerDeserializer", computer.user3.name);
}
private static final class Computer {
@JsonAdapter(UserSerializer.class) final User user1;
@JsonAdapter(UserDeserializer.class) final User user2;
@JsonAdapter(UserSerializerDeserializer.class) final User user3;
Computer(User user1, User user2, User user3) {
this.user1 = user1;
this.user2 = user2;
this.user3 = user3;
}
}
private static final class User {
public final String name;
private User(String name) {
this.name = name;
}
}
private static final class UserSerializer implements JsonSerializer<User> {
@Override
public JsonElement serialize(User src, Type typeOfSrc, JsonSerializationContext context) {
return new JsonPrimitive("UserSerializer");
}
}
private static final class UserDeserializer implements JsonDeserializer<User> {
@Override
public User deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
throws JsonParseException {
return new User("UserSerializer");
}
}
private static final class UserSerializerDeserializer implements JsonSerializer<User>, JsonDeserializer<User> {
@Override
public JsonElement serialize(User src, Type typeOfSrc, JsonSerializationContext context) {
return new JsonPrimitive("UserSerializerDeserializer");
}
@Override
public User deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
throws JsonParseException {
return new User("UserSerializerDeserializer");
}
}
public void testJsonSerializerDeserializerBasedJsonAdapterOnClass() {
Gson gson = new Gson();
String json = gson.toJson(new Computer2(new User2("Inderjeet Singh")));
assertEquals("{\"user\":\"UserSerializerDeserializer2\"}", json);
Computer2 computer = gson.fromJson("{'user':'Inderjeet Singh'}", Computer2.class);
assertEquals("UserSerializerDeserializer2", computer.user.name);
}
private static final class Computer2 {
final User2 user;
Computer2(User2 user) {
this.user = user;
}
}
@JsonAdapter(UserSerializerDeserializer2.class)
private static final class User2 {
public final String name;
private User2(String name) {
this.name = name;
}
}
private static final class UserSerializerDeserializer2 implements JsonSerializer<User2>, JsonDeserializer<User2> {
@Override
public JsonElement serialize(User2 src, Type typeOfSrc, JsonSerializationContext context) {
return new JsonPrimitive("UserSerializerDeserializer2");
}
@Override
public User2 deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
throws JsonParseException {
return new User2("UserSerializerDeserializer2");
}
}
public void testDifferentJsonAdaptersForGenericFieldsOfSameRawType() {
Container c = new Container("Foo", 10);
Gson gson = new Gson();
String json = gson.toJson(c);
assertTrue(json.contains("\"a\":\"BaseStringAdapter\""));
assertTrue(json.contains("\"b\":\"BaseIntegerAdapter\""));
}
private static final class Container {
@JsonAdapter(BaseStringAdapter.class) Base<String> a;
@JsonAdapter(BaseIntegerAdapter.class) Base<Integer> b;
Container(String a, int b) {
this.a = new Base<>(a);
this.b = new Base<>(b);
}
}
private static final class Base<T> {
@SuppressWarnings("unused")
T value;
Base(T value) {
this.value = value;
}
}
private static final class BaseStringAdapter implements JsonSerializer<Base<String>> {
@Override public JsonElement serialize(Base<String> src, Type typeOfSrc, JsonSerializationContext context) {
return new JsonPrimitive("BaseStringAdapter");
}
}
private static final class BaseIntegerAdapter implements JsonSerializer<Base<Integer>> {
@Override public JsonElement serialize(Base<Integer> src, Type typeOfSrc, JsonSerializationContext context) {
return new JsonPrimitive("BaseIntegerAdapter");
}
}
public void testJsonAdapterNullSafe() {
Gson gson = new Gson();
String json = gson.toJson(new Computer3(null, null));
assertEquals("{\"user1\":\"UserSerializerDeserializer\"}", json);
Computer3 computer3 = gson.fromJson("{\"user1\":null, \"user2\":null}", Computer3.class);
assertEquals("UserSerializerDeserializer", computer3.user1.name);
assertNull(computer3.user2);
}
private static final class Computer3 {
@JsonAdapter(value = UserSerializerDeserializer.class, nullSafe = false) final User user1;
@JsonAdapter(value = UserSerializerDeserializer.class) final User user2;
Computer3(User user1, User user2) {
this.user1 = user1;
this.user2 = user2;
}
}
}
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