![Éamonn McManus](/assets/img/avatar_default.png)
This annotation indicates that return value of the annotated method does not need to be used. If it is _not_ present on a non-void method, and if Error Prone's `CheckReturnValue` is active, then calling the method without using the result is an error. However, we are not enabling `CheckReturnValue` by default here. Also update some code that does ignore return values, so that the returned value is used, if only by assigning it to an unused variable.
196 lines
6.0 KiB
Java
196 lines
6.0 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.graph;
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import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.assertSame;
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import java.lang.reflect.Type;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.List;
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import org.junit.Test;
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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.reflect.TypeToken;
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public final class GraphAdapterBuilderTest {
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@Test
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public void testSerialization() {
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Roshambo rock = new Roshambo("ROCK");
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Roshambo scissors = new Roshambo("SCISSORS");
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Roshambo paper = new Roshambo("PAPER");
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rock.beats = scissors;
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scissors.beats = paper;
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paper.beats = rock;
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GsonBuilder gsonBuilder = new GsonBuilder();
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new GraphAdapterBuilder()
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.addType(Roshambo.class)
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.registerOn(gsonBuilder);
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Gson gson = gsonBuilder.create();
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assertEquals("{'0x1':{'name':'ROCK','beats':'0x2'}," +
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"'0x2':{'name':'SCISSORS','beats':'0x3'}," +
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"'0x3':{'name':'PAPER','beats':'0x1'}}",
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gson.toJson(rock).replace('"', '\''));
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}
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@Test
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public void testDeserialization() {
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String json = "{'0x1':{'name':'ROCK','beats':'0x2'}," +
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"'0x2':{'name':'SCISSORS','beats':'0x3'}," +
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"'0x3':{'name':'PAPER','beats':'0x1'}}";
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GsonBuilder gsonBuilder = new GsonBuilder();
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new GraphAdapterBuilder()
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.addType(Roshambo.class)
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.registerOn(gsonBuilder);
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Gson gson = gsonBuilder.create();
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Roshambo rock = gson.fromJson(json, Roshambo.class);
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assertEquals("ROCK", rock.name);
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Roshambo scissors = rock.beats;
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assertEquals("SCISSORS", scissors.name);
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Roshambo paper = scissors.beats;
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assertEquals("PAPER", paper.name);
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assertSame(rock, paper.beats);
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}
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@Test
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public void testDeserializationDirectSelfReference() {
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String json = "{'0x1':{'name':'SUICIDE','beats':'0x1'}}";
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GsonBuilder gsonBuilder = new GsonBuilder();
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new GraphAdapterBuilder()
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.addType(Roshambo.class)
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.registerOn(gsonBuilder);
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Gson gson = gsonBuilder.create();
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Roshambo suicide = gson.fromJson(json, Roshambo.class);
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assertEquals("SUICIDE", suicide.name);
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assertSame(suicide, suicide.beats);
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}
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@Test
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public void testSerializeListOfLists() {
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Type listOfListsType = new TypeToken<List<List<?>>>() {}.getType();
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Type listOfAnyType = new TypeToken<List<?>>() {}.getType();
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List<List<?>> listOfLists = new ArrayList<>();
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listOfLists.add(listOfLists);
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listOfLists.add(new ArrayList<>());
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GsonBuilder gsonBuilder = new GsonBuilder();
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new GraphAdapterBuilder()
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.addType(listOfListsType)
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.addType(listOfAnyType)
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.registerOn(gsonBuilder);
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Gson gson = gsonBuilder.create();
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String json = gson.toJson(listOfLists, listOfListsType);
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assertEquals("{'0x1':['0x1','0x2'],'0x2':[]}", json.replace('"', '\''));
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}
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@Test
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public void testDeserializeListOfLists() {
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Type listOfAnyType = new TypeToken<List<?>>() {}.getType();
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Type listOfListsType = new TypeToken<List<List<?>>>() {}.getType();
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GsonBuilder gsonBuilder = new GsonBuilder();
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new GraphAdapterBuilder()
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.addType(listOfListsType)
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.addType(listOfAnyType)
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.registerOn(gsonBuilder);
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Gson gson = gsonBuilder.create();
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List<List<?>> listOfLists = gson.fromJson("{'0x1':['0x1','0x2'],'0x2':[]}", listOfListsType);
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assertEquals(2, listOfLists.size());
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assertSame(listOfLists, listOfLists.get(0));
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assertEquals(Collections.emptyList(), listOfLists.get(1));
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}
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@Test
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public void testSerializationWithMultipleTypes() {
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Company google = new Company("Google");
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Employee unused1 = new Employee("Jesse", google);
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Employee unused2 = new Employee("Joel", google);
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GsonBuilder gsonBuilder = new GsonBuilder();
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new GraphAdapterBuilder()
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.addType(Company.class)
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.addType(Employee.class)
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.registerOn(gsonBuilder);
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Gson gson = gsonBuilder.create();
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assertEquals("{'0x1':{'name':'Google','employees':['0x2','0x3']},"
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+ "'0x2':{'name':'Jesse','company':'0x1'},"
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+ "'0x3':{'name':'Joel','company':'0x1'}}",
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gson.toJson(google).replace('"', '\''));
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}
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@Test
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public void testDeserializationWithMultipleTypes() {
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GsonBuilder gsonBuilder = new GsonBuilder();
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new GraphAdapterBuilder()
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.addType(Company.class)
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.addType(Employee.class)
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.registerOn(gsonBuilder);
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Gson gson = gsonBuilder.create();
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String json = "{'0x1':{'name':'Google','employees':['0x2','0x3']},"
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+ "'0x2':{'name':'Jesse','company':'0x1'},"
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+ "'0x3':{'name':'Joel','company':'0x1'}}";
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Company company = gson.fromJson(json, Company.class);
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assertEquals("Google", company.name);
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Employee jesse = company.employees.get(0);
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assertEquals("Jesse", jesse.name);
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assertEquals(company, jesse.company);
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Employee joel = company.employees.get(1);
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assertEquals("Joel", joel.name);
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assertEquals(company, joel.company);
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}
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static class Roshambo {
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String name;
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Roshambo beats;
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Roshambo(String name) {
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this.name = name;
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}
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}
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static class Employee {
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final String name;
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final Company company;
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Employee(String name, Company company) {
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this.name = name;
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this.company = company;
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this.company.employees.add(this);
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}
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}
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static class Company {
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final String name;
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final List<Employee> employees = new ArrayList<>();
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Company(String name) {
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this.name = name;
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}
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}
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}
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