227 lines
7.4 KiB
Java
227 lines
7.4 KiB
Java
/*
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* Copyright (C) 2011 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 static org.junit.Assert.assertEquals;
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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.JsonDeserializationContext;
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import com.google.gson.JsonDeserializer;
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import com.google.gson.JsonElement;
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import com.google.gson.JsonObject;
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import com.google.gson.JsonParseException;
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import com.google.gson.JsonPrimitive;
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import com.google.gson.JsonSerializationContext;
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import com.google.gson.JsonSerializer;
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import java.lang.reflect.Type;
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import org.junit.Test;
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/**
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* Test that the hierarchy adapter works when subtypes are used.
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*/
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public final class TypeHierarchyAdapterTest {
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@Test
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public void testTypeHierarchy() {
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Manager andy = new Manager();
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andy.userid = "andy";
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andy.startDate = 2005;
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andy.minions = new Employee[] {
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new Employee("inder", 2007),
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new Employee("joel", 2006),
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new Employee("jesse", 2006),
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};
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CEO eric = new CEO();
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eric.userid = "eric";
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eric.startDate = 2001;
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eric.assistant = new Employee("jerome", 2006);
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eric.minions = new Employee[] {
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new Employee("larry", 1998),
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new Employee("sergey", 1998),
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andy,
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};
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Gson gson = new GsonBuilder()
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.registerTypeHierarchyAdapter(Employee.class, new EmployeeAdapter())
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.setPrettyPrinting()
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.create();
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Company company = new Company();
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company.ceo = eric;
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String json = gson.toJson(company, Company.class);
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assertEquals("{\n" +
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" \"ceo\": {\n" +
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" \"userid\": \"eric\",\n" +
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" \"startDate\": 2001,\n" +
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" \"minions\": [\n" +
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" {\n" +
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" \"userid\": \"larry\",\n" +
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" \"startDate\": 1998\n" +
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" },\n" +
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" {\n" +
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" \"userid\": \"sergey\",\n" +
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" \"startDate\": 1998\n" +
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" },\n" +
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" {\n" +
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" \"userid\": \"andy\",\n" +
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" \"startDate\": 2005,\n" +
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" \"minions\": [\n" +
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" {\n" +
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" \"userid\": \"inder\",\n" +
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" \"startDate\": 2007\n" +
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" },\n" +
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" {\n" +
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" \"userid\": \"joel\",\n" +
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" \"startDate\": 2006\n" +
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" },\n" +
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" {\n" +
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" \"userid\": \"jesse\",\n" +
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" \"startDate\": 2006\n" +
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" }\n" +
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" ]\n" +
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" }\n" +
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" ],\n" +
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" \"assistant\": {\n" +
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" \"userid\": \"jerome\",\n" +
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" \"startDate\": 2006\n" +
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" }\n" +
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" }\n" +
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"}", json);
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Company copied = gson.fromJson(json, Company.class);
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assertEquals(json, gson.toJson(copied, Company.class));
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assertEquals(copied.ceo.userid, company.ceo.userid);
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assertEquals(copied.ceo.assistant.userid, company.ceo.assistant.userid);
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assertEquals(copied.ceo.minions[0].userid, company.ceo.minions[0].userid);
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assertEquals(copied.ceo.minions[1].userid, company.ceo.minions[1].userid);
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assertEquals(copied.ceo.minions[2].userid, company.ceo.minions[2].userid);
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assertEquals(((Manager) copied.ceo.minions[2]).minions[0].userid,
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((Manager) company.ceo.minions[2]).minions[0].userid);
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assertEquals(((Manager) copied.ceo.minions[2]).minions[1].userid,
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((Manager) company.ceo.minions[2]).minions[1].userid);
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}
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@Test
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public void testRegisterSuperTypeFirst() {
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Gson gson = new GsonBuilder()
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.registerTypeHierarchyAdapter(Employee.class, new EmployeeAdapter())
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.registerTypeHierarchyAdapter(Manager.class, new ManagerAdapter())
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.create();
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Manager manager = new Manager();
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manager.userid = "inder";
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String json = gson.toJson(manager, Manager.class);
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assertEquals("\"inder\"", json);
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Manager copied = gson.fromJson(json, Manager.class);
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assertEquals(manager.userid, copied.userid);
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}
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/** This behaviour changed in Gson 2.1; it used to throw. */
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@Test
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public void testRegisterSubTypeFirstAllowed() {
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new GsonBuilder()
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.registerTypeHierarchyAdapter(Manager.class, new ManagerAdapter())
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.registerTypeHierarchyAdapter(Employee.class, new EmployeeAdapter())
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.create();
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}
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static class ManagerAdapter implements JsonSerializer<Manager>, JsonDeserializer<Manager> {
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@Override public Manager deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) {
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Manager result = new Manager();
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result.userid = json.getAsString();
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return result;
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}
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@Override public JsonElement serialize(Manager src, Type typeOfSrc, JsonSerializationContext context) {
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return new JsonPrimitive(src.userid);
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}
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}
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static class EmployeeAdapter implements JsonSerializer<Employee>, JsonDeserializer<Employee> {
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@Override public JsonElement serialize(Employee employee, Type typeOfSrc,
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JsonSerializationContext context) {
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JsonObject result = new JsonObject();
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result.add("userid", context.serialize(employee.userid, String.class));
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result.add("startDate", context.serialize(employee.startDate, long.class));
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if (employee instanceof Manager) {
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result.add("minions", context.serialize(((Manager) employee).minions, Employee[].class));
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if (employee instanceof CEO) {
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result.add("assistant", context.serialize(((CEO) employee).assistant, Employee.class));
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}
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}
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return result;
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}
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@Override public Employee deserialize(JsonElement json, Type typeOfT,
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JsonDeserializationContext context) throws JsonParseException {
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JsonObject object = json.getAsJsonObject();
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Employee result = null;
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// if the employee has an assistant, she must be the CEO
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JsonElement assistant = object.get("assistant");
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if (assistant != null) {
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result = new CEO();
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((CEO) result).assistant = context.deserialize(assistant, Employee.class);
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}
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// only managers have minions
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JsonElement minons = object.get("minions");
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if (minons != null) {
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if (result == null) {
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result = new Manager();
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}
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((Manager) result).minions = context.deserialize(minons, Employee[].class);
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}
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if (result == null) {
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result = new Employee();
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}
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result.userid = context.deserialize(object.get("userid"), String.class);
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result.startDate = context.<Long>deserialize(object.get("startDate"), long.class);
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return result;
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}
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}
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static class Employee {
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String userid;
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long startDate;
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Employee(String userid, long startDate) {
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this.userid = userid;
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this.startDate = startDate;
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}
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Employee() {}
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}
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static class Manager extends Employee {
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Employee[] minions;
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}
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static class CEO extends Manager {
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Employee assistant;
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}
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static class Company {
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CEO ceo;
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}
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}
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