2011-04-19 22:26:16 +02:00
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/*
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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 com.google.gson.Gson;
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import com.google.gson.JsonObject;
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import junit.framework.TestCase;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.HashMap;
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import java.util.Map;
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/**
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* Tests for Gson serialization of a sub-class object while encountering a base-class type
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*
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* @author Inderjeet Singh
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*/
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@SuppressWarnings("unused")
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public class MoreSpecificTypeSerializationTest extends TestCase {
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private Gson gson;
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@Override
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protected void setUp() throws Exception {
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super.setUp();
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gson = new Gson();
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}
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public void testSubclassFields() {
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ClassWithBaseFields target = new ClassWithBaseFields(new Sub(1, 2));
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String json = gson.toJson(target);
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assertTrue(json.contains("\"b\":1"));
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assertTrue(json.contains("\"s\":2"));
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}
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public void disabled_testListOfSubclassFields() {
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Collection<Base> list = new ArrayList<Base>();
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list.add(new Base(1));
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list.add(new Sub(2, 3));
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ClassWithContainersOfBaseFields target = new ClassWithContainersOfBaseFields(list, null);
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String json = gson.toJson(target);
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assertTrue(json, json.contains("{\"b\":1}"));
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assertTrue(json, json.contains("{\"b\":2,\"s\":3}"));
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}
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public void testMapOfSubclassFields() {
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Map<String, Base> map = new HashMap<String, Base>();
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map.put("base", new Base(1));
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map.put("sub", new Sub(2, 3));
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ClassWithContainersOfBaseFields target = new ClassWithContainersOfBaseFields(null, map);
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JsonObject json = gson.toJsonTree(target).getAsJsonObject().get("map").getAsJsonObject();
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assertEquals(1, json.get("base").getAsJsonObject().get("b").getAsInt());
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JsonObject sub = json.get("sub").getAsJsonObject();
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assertEquals(2, sub.get("b").getAsInt());
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assertEquals(3, sub.get("s").getAsInt());
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}
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2011-04-19 22:49:48 +02:00
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/**
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* For parameterized type, Gson ignores the more-specific type and sticks to the declared type
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*/
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public void testParameterizedSubclassFields() {
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ClassWithParameterizedBaseFields target = new ClassWithParameterizedBaseFields(
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new ParameterizedSub<String>("one", "two"));
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String json = gson.toJson(target);
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assertTrue(json.contains("\"t\":\"one\""));
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assertFalse(json.contains("\"s\""));
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}
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/**
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* For parameterized type in a List, Gson ignores the more-specific type and sticks to
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* the declared type
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*/
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public void testListOfParameterizedSubclassFields() {
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Collection<ParameterizedBase<String>> list = new ArrayList<ParameterizedBase<String>>();
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list.add(new ParameterizedBase<String>("one"));
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list.add(new ParameterizedSub<String>("two", "three"));
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ClassWithContainersOfParameterizedBaseFields target =
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new ClassWithContainersOfParameterizedBaseFields(list, null);
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String json = gson.toJson(target);
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assertTrue(json, json.contains("{\"t\":\"one\"}"));
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assertFalse(json, json.contains("\"s\":"));
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}
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/**
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* For parameterized type in a map, Gson ignores the more-specific type and sticks to the
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* declared type
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*/
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public void testMapOfParameterizedSubclassFields() {
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Map<String, ParameterizedBase<String>> map = new HashMap<String, ParameterizedBase<String>>();
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map.put("base", new ParameterizedBase<String>("one"));
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map.put("sub", new ParameterizedSub<String>("two", "three"));
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ClassWithContainersOfParameterizedBaseFields target =
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new ClassWithContainersOfParameterizedBaseFields(null, map);
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JsonObject json = gson.toJsonTree(target).getAsJsonObject().get("map").getAsJsonObject();
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assertEquals("one", json.get("base").getAsJsonObject().get("t").getAsString());
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JsonObject sub = json.get("sub").getAsJsonObject();
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assertEquals("two", sub.get("t").getAsString());
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assertNull(sub.get("s"));
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}
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2011-04-19 22:26:16 +02:00
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private static class Base {
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int b;
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Base(int b) {
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this.b = b;
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}
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}
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private static class Sub extends Base {
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int s;
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Sub(int b, int s) {
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super(b);
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this.s = s;
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}
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}
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private static class ClassWithBaseFields {
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Base b;
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ClassWithBaseFields(Base b) {
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this.b = b;
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}
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}
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private static class ClassWithContainersOfBaseFields {
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Collection<Base> collection;
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Map<String, Base> map;
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ClassWithContainersOfBaseFields(Collection<Base> collection, Map<String, Base> map) {
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this.collection = collection;
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this.map = map;
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}
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}
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2011-04-19 22:49:48 +02:00
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private static class ParameterizedBase<T> {
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T t;
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ParameterizedBase(T t) {
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this.t = t;
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}
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}
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private static class ParameterizedSub<T> extends ParameterizedBase<T> {
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T s;
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ParameterizedSub(T t, T s) {
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super(t);
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this.s = s;
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}
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}
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private static class ClassWithParameterizedBaseFields {
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ParameterizedBase<String> b;
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ClassWithParameterizedBaseFields(ParameterizedBase<String> b) {
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this.b = b;
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}
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}
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private static class ClassWithContainersOfParameterizedBaseFields {
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Collection<ParameterizedBase<String>> collection;
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Map<String, ParameterizedBase<String>> map;
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ClassWithContainersOfParameterizedBaseFields(Collection<ParameterizedBase<String>> collection,
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Map<String, ParameterizedBase<String>> map) {
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this.collection = collection;
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this.map = map;
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}
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}
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2011-04-19 22:26:16 +02:00
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}
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