added functional tests for applying JsonAdapter annotation on Fields.
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/*
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* Copyright (C) 2014 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.functional;
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import java.io.IOException;
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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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import com.google.gson.TypeAdapter;
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import com.google.gson.annotations.JsonAdapter;
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import com.google.gson.stream.JsonReader;
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import com.google.gson.stream.JsonWriter;
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/**
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* Functional tests for the {@link com.google.gson.annotations.JsonAdapter} annotation on fields.
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*/
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public final class JsonAdapterAnnotationOnFieldsTest extends TestCase {
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public void testJsonAdapterInvoked() {
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Gson gson = new Gson();
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String json = gson.toJson(new Computer(new User("Inderjeet Singh")));
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assertEquals("{\"user\":{\"firstName\":\"Inderjeet\",\"lastName\":\"Singh\"}}", json);
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Computer computer = gson.fromJson("{'user':{'firstName':'Jesse','lastName':'Wilson'}}", Computer.class);
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assertEquals("Jesse Wilson", computer.user.name);
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}
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public void testRegisteredTypeAdapterOverridesFieldAnnotation() {
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Gson gson = new GsonBuilder()
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.registerTypeAdapter(Part.class, new TypeAdapter<Part>() {
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@Override public void write(JsonWriter out, Part user) throws IOException {
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out.value("registeredAdapter");
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}
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@Override public Part read(JsonReader in) throws IOException {
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return new Part(in.nextString());
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}
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}).create();
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String json = gson.toJson(new Gadget(new Part("screen")));
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assertEquals("{\"part\":\"registeredAdapter\"}", json);
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Gadget gadget = gson.fromJson("{'part':'registeredAdapterValue'}", Gadget.class);
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assertEquals("registeredAdapterValue", gadget.part.name);
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}
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private static final class Gadget {
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@JsonAdapter(PartJsonAdapter.class)
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final Part part;
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Gadget(Part part) {
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this.part = part;
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}
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}
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private static final class Part {
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final String name;
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Part(String name) {
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this.name = name;
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}
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}
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private static class PartJsonAdapter extends TypeAdapter<Part> {
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@Override public void write(JsonWriter out, Part part) throws IOException {
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out.value(part.name);
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}
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@Override public Part read(JsonReader in) throws IOException {
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in.nextString();
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return new Part("partJsonAdapter");
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}
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}
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private static final class Computer {
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@JsonAdapter(UserJsonAdapter.class)
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final User user;
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Computer(User user) {
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this.user = user;
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}
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}
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@JsonAdapter(UserJsonAdapter.class)
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private static class User {
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public final String name;
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private User(String name) {
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this.name = name;
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}
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}
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private static class UserJsonAdapter extends TypeAdapter<User> {
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@Override public void write(JsonWriter out, User user) throws IOException {
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// implement write: combine firstName and lastName into name
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out.beginObject();
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String[] parts = user.name.split(" ");
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out.name("firstName");
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out.value(parts[0]);
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out.name("lastName");
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out.value(parts[1]);
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out.endObject();
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}
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@Override public User read(JsonReader in) throws IOException {
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// implement read: split name into firstName and lastName
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in.beginObject();
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in.nextName();
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String firstName = in.nextString();
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in.nextName();
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String lastName = in.nextString();
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in.endObject();
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return new User(firstName + " " + lastName);
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}
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}
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}
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