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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 com.google.gson.Gson;
import com.google.gson.JsonObject;
import junit.framework.TestCase;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
/**
* Tests for Gson serialization of a sub-class object while encountering a base-class type
*
* @author Inderjeet Singh
*/
@SuppressWarnings("unused")
public class MoreSpecificTypeSerializationTest extends TestCase {
private Gson gson;
@Override
protected void setUp() throws Exception {
super.setUp();
gson = new Gson();
}
public void testSubclassFields() {
ClassWithBaseFields target = new ClassWithBaseFields(new Sub(1, 2));
String json = gson.toJson(target);
assertTrue(json.contains("\"b\":1"));
assertTrue(json.contains("\"s\":2"));
}
public void testListOfSubclassFields() {
Collection<Base> list = new ArrayList<Base>();
list.add(new Base(1));
list.add(new Sub(2, 3));
ClassWithContainersOfBaseFields target = new ClassWithContainersOfBaseFields(list, null);
String json = gson.toJson(target);
assertTrue(json, json.contains("{\"b\":1}"));
assertTrue(json, json.contains("{\"s\":3,\"b\":2}"));
}
public void testMapOfSubclassFields() {
Map<String, Base> map = new HashMap<String, Base>();
map.put("base", new Base(1));
map.put("sub", new Sub(2, 3));
ClassWithContainersOfBaseFields target = new ClassWithContainersOfBaseFields(null, map);
JsonObject json = gson.toJsonTree(target).getAsJsonObject().get("map").getAsJsonObject();
assertEquals(1, json.get("base").getAsJsonObject().get("b").getAsInt());
JsonObject sub = json.get("sub").getAsJsonObject();
assertEquals(2, sub.get("b").getAsInt());
assertEquals(3, sub.get("s").getAsInt());
}
/**
* For parameterized type, Gson ignores the more-specific type and sticks to the declared type
*/
public void testParameterizedSubclassFields() {
ClassWithParameterizedBaseFields target = new ClassWithParameterizedBaseFields(
new ParameterizedSub<String>("one", "two"));
String json = gson.toJson(target);
assertTrue(json.contains("\"t\":\"one\""));
assertFalse(json.contains("\"s\""));
}
/**
* For parameterized type in a List, Gson ignores the more-specific type and sticks to
* the declared type
*/
public void testListOfParameterizedSubclassFields() {
Collection<ParameterizedBase<String>> list = new ArrayList<ParameterizedBase<String>>();
list.add(new ParameterizedBase<String>("one"));
list.add(new ParameterizedSub<String>("two", "three"));
ClassWithContainersOfParameterizedBaseFields target =
new ClassWithContainersOfParameterizedBaseFields(list, null);
String json = gson.toJson(target);
assertTrue(json, json.contains("{\"t\":\"one\"}"));
assertFalse(json, json.contains("\"s\":"));
}
/**
* For parameterized type in a map, Gson ignores the more-specific type and sticks to the
* declared type
*/
public void testMapOfParameterizedSubclassFields() {
Map<String, ParameterizedBase<String>> map = new HashMap<String, ParameterizedBase<String>>();
map.put("base", new ParameterizedBase<String>("one"));
map.put("sub", new ParameterizedSub<String>("two", "three"));
ClassWithContainersOfParameterizedBaseFields target =
new ClassWithContainersOfParameterizedBaseFields(null, map);
JsonObject json = gson.toJsonTree(target).getAsJsonObject().get("map").getAsJsonObject();
assertEquals("one", json.get("base").getAsJsonObject().get("t").getAsString());
JsonObject sub = json.get("sub").getAsJsonObject();
assertEquals("two", sub.get("t").getAsString());
assertNull(sub.get("s"));
}
private static class Base {
int b;
Base(int b) {
this.b = b;
}
}
private static class Sub extends Base {
int s;
Sub(int b, int s) {
super(b);
this.s = s;
}
}
private static class ClassWithBaseFields {
Base b;
ClassWithBaseFields(Base b) {
this.b = b;
}
}
private static class ClassWithContainersOfBaseFields {
Collection<Base> collection;
Map<String, Base> map;
ClassWithContainersOfBaseFields(Collection<Base> collection, Map<String, Base> map) {
this.collection = collection;
this.map = map;
}
}
private static class ParameterizedBase<T> {
T t;
ParameterizedBase(T t) {
this.t = t;
}
}
private static class ParameterizedSub<T> extends ParameterizedBase<T> {
T s;
ParameterizedSub(T t, T s) {
super(t);
this.s = s;
}
}
private static class ClassWithParameterizedBaseFields {
ParameterizedBase<String> b;
ClassWithParameterizedBaseFields(ParameterizedBase<String> b) {
this.b = b;
}
}
private static class ClassWithContainersOfParameterizedBaseFields {
Collection<ParameterizedBase<String>> collection;
Map<String, ParameterizedBase<String>> map;
ClassWithContainersOfParameterizedBaseFields(Collection<ParameterizedBase<String>> collection,
Map<String, ParameterizedBase<String>> map) {
this.collection = collection;
this.map = map;
}
}
}
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