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/*
* Copyright (C) 2011 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 static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
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.reflect.TypeToken;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.junit.Before;
import org.junit.Test;
/**
* Collection of functional tests for DOM tree based type adapters.
*/
public class TreeTypeAdaptersTest {
private static final Id<Student> STUDENT1_ID = new Id<>("5", Student.class);
private static final Id<Student> STUDENT2_ID = new Id<>("6", Student.class);
private static final Student STUDENT1 = new Student(STUDENT1_ID, "first");
private static final Student STUDENT2 = new Student(STUDENT2_ID, "second");
private static final Type TYPE_COURSE_HISTORY =
new TypeToken<Course<HistoryCourse>>(){}.getType();
private static final Id<Course<HistoryCourse>> COURSE_ID =
new Id<>("10", TYPE_COURSE_HISTORY);
private Gson gson;
private Course<HistoryCourse> course;
@Before
public void setUp() {
gson = new GsonBuilder()
.registerTypeAdapter(Id.class, new IdTreeTypeAdapter())
.create();
course = new Course<>(COURSE_ID, 4,
new Assignment<HistoryCourse>(null, null), Arrays.asList(STUDENT1, STUDENT2));
}
@Test
public void testSerializeId() {
String json = gson.toJson(course, TYPE_COURSE_HISTORY);
assertTrue(json.contains(String.valueOf(COURSE_ID.getValue())));
assertTrue(json.contains(String.valueOf(STUDENT1_ID.getValue())));
assertTrue(json.contains(String.valueOf(STUDENT2_ID.getValue())));
}
@Test
public void testDeserializeId() {
String json = "{courseId:1,students:[{id:1,name:'first'},{id:6,name:'second'}],"
+ "numAssignments:4,assignment:{}}";
Course<HistoryCourse> target = gson.fromJson(json, TYPE_COURSE_HISTORY);
assertEquals("1", target.getStudents().get(0).id.getValue());
assertEquals("6", target.getStudents().get(1).id.getValue());
assertEquals("1", target.getId().getValue());
}
private static final class Id<R> {
final String value;
@SuppressWarnings("unused")
final Type typeOfId;
private Id(String value, Type typeOfId) {
this.value = value;
this.typeOfId = typeOfId;
}
public String getValue() {
return value;
}
}
private static final class IdTreeTypeAdapter implements JsonSerializer<Id<?>>,
JsonDeserializer<Id<?>> {
@Override
public Id<?> deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
throws JsonParseException {
if (!(typeOfT instanceof ParameterizedType)) {
throw new JsonParseException("Id of unknown type: " + typeOfT);
}
ParameterizedType parameterizedType = (ParameterizedType) typeOfT;
// Since Id takes only one TypeVariable, the actual type corresponding to the first
// TypeVariable is the Type we are looking for
Type typeOfId = parameterizedType.getActualTypeArguments()[0];
return new Id<>(json.getAsString(), typeOfId);
}
@Override
public JsonElement serialize(Id<?> src, Type typeOfSrc, JsonSerializationContext context) {
return new JsonPrimitive(src.getValue());
}
}
@SuppressWarnings("unused")
private static class Student {
Id<Student> id;
String name;
private Student() {
this(null, null);
}
public Student(Id<Student> id, String name) {
this.id = id;
this.name = name;
}
}
@SuppressWarnings("unused")
private static class Course<T> {
final List<Student> students;
private final Id<Course<T>> courseId;
private final int numAssignments;
private final Assignment<T> assignment;
private Course() {
this(null, 0, null, new ArrayList<Student>());
}
public Course(Id<Course<T>> courseId, int numAssignments,
Assignment<T> assignment, List<Student> players) {
this.courseId = courseId;
this.numAssignments = numAssignments;
this.assignment = assignment;
this.students = players;
}
public Id<Course<T>> getId() {
return courseId;
}
List<Student> getStudents() {
return students;
}
}
@SuppressWarnings("unused")
private static class Assignment<T> {
private final Id<Assignment<T>> id;
private final T data;
private Assignment() {
this(null, null);
}
public Assignment(Id<Assignment<T>> id, T data) {
this.id = id;
this.data = data;
}
}
@SuppressWarnings("unused")
private static class HistoryCourse {
int numClasses;
}
}
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