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