| /* |
| * Copyright (C) 2009 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.GsonBuilder; |
| import com.google.gson.InstanceCreator; |
| import com.google.gson.common.TestTypes.Base; |
| import com.google.gson.common.TestTypes.ClassWithBaseField; |
| import com.google.gson.common.TestTypes.Sub; |
| |
| import com.google.gson.reflect.TypeToken; |
| import java.util.ArrayList; |
| import java.util.List; |
| import junit.framework.TestCase; |
| |
| import java.lang.reflect.Type; |
| import java.util.SortedSet; |
| import java.util.TreeSet; |
| |
| /** |
| * Functional Test exercising custom serialization only. When test applies to both |
| * serialization and deserialization then add it to CustomTypeAdapterTest. |
| * |
| * @author Inderjeet Singh |
| */ |
| public class InstanceCreatorTest extends TestCase { |
| |
| public void testInstanceCreatorReturnsBaseType() { |
| Gson gson = new GsonBuilder() |
| .registerTypeAdapter(Base.class, new InstanceCreator<Base>() { |
| @Override public Base createInstance(Type type) { |
| return new Base(); |
| } |
| }) |
| .create(); |
| String json = "{baseName:'BaseRevised',subName:'Sub'}"; |
| Base base = gson.fromJson(json, Base.class); |
| assertEquals("BaseRevised", base.baseName); |
| } |
| |
| public void testInstanceCreatorReturnsSubTypeForTopLevelObject() { |
| Gson gson = new GsonBuilder() |
| .registerTypeAdapter(Base.class, new InstanceCreator<Base>() { |
| @Override public Base createInstance(Type type) { |
| return new Sub(); |
| } |
| }) |
| .create(); |
| |
| String json = "{baseName:'Base',subName:'SubRevised'}"; |
| Base base = gson.fromJson(json, Base.class); |
| assertTrue(base instanceof Sub); |
| |
| Sub sub = (Sub) base; |
| assertFalse("SubRevised".equals(sub.subName)); |
| assertEquals(Sub.SUB_NAME, sub.subName); |
| } |
| |
| public void testInstanceCreatorReturnsSubTypeForField() { |
| Gson gson = new GsonBuilder() |
| .registerTypeAdapter(Base.class, new InstanceCreator<Base>() { |
| @Override public Base createInstance(Type type) { |
| return new Sub(); |
| } |
| }) |
| .create(); |
| String json = "{base:{baseName:'Base',subName:'SubRevised'}}"; |
| ClassWithBaseField target = gson.fromJson(json, ClassWithBaseField.class); |
| assertTrue(target.base instanceof Sub); |
| assertEquals(Sub.SUB_NAME, ((Sub)target.base).subName); |
| } |
| |
| // This regressed in Gson 2.0 and 2.1 |
| public void testInstanceCreatorForCollectionType() { |
| @SuppressWarnings("serial") |
| class SubArrayList<T> extends ArrayList<T> {} |
| InstanceCreator<List<String>> listCreator = new InstanceCreator<List<String>>() { |
| @Override public List<String> createInstance(Type type) { |
| return new SubArrayList<String>(); |
| } |
| }; |
| Type listOfStringType = new TypeToken<List<String>>() {}.getType(); |
| Gson gson = new GsonBuilder() |
| .registerTypeAdapter(listOfStringType, listCreator) |
| .create(); |
| List<String> list = gson.fromJson("[\"a\"]", listOfStringType); |
| assertEquals(SubArrayList.class, list.getClass()); |
| } |
| |
| @SuppressWarnings({ "unchecked", "rawtypes" }) |
| public void testInstanceCreatorForParametrizedType() throws Exception { |
| @SuppressWarnings("serial") |
| class SubTreeSet<T> extends TreeSet<T> {} |
| InstanceCreator<SortedSet> sortedSetCreator = new InstanceCreator<SortedSet>() { |
| @Override public SortedSet createInstance(Type type) { |
| return new SubTreeSet(); |
| } |
| }; |
| Gson gson = new GsonBuilder() |
| .registerTypeAdapter(SortedSet.class, sortedSetCreator) |
| .create(); |
| |
| Type sortedSetType = new TypeToken<SortedSet<String>>() {}.getType(); |
| SortedSet<String> set = gson.fromJson("[\"a\"]", sortedSetType); |
| assertEquals(set.first(), "a"); |
| assertEquals(SubTreeSet.class, set.getClass()); |
| |
| set = gson.fromJson("[\"b\"]", SortedSet.class); |
| assertEquals(set.first(), "b"); |
| assertEquals(SubTreeSet.class, set.getClass()); |
| } |
| } |