| /* |
| * 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<>(); |
| 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<>(); |
| 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<>("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<>(); |
| list.add(new ParameterizedBase<>("one")); |
| list.add(new ParameterizedSub<>("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<>(); |
| map.put("base", new ParameterizedBase<>("one")); |
| map.put("sub", new ParameterizedSub<>("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; |
| } |
| } |
| } |