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/*
* 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 static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;
import com.google.gson.common.TestTypes.Base;
import com.google.gson.common.TestTypes.BaseSerializer;
import com.google.gson.common.TestTypes.ClassWithBaseArrayField;
import com.google.gson.common.TestTypes.ClassWithBaseField;
import com.google.gson.common.TestTypes.Sub;
import com.google.gson.common.TestTypes.SubSerializer;
import java.lang.reflect.Type;
import org.junit.Test;
/**
* Functional Test exercising custom serialization only. When test applies to both
* serialization and deserialization then add it to CustomTypeAdapterTest.
*
* @author Inderjeet Singh
*/
public class CustomSerializerTest {
@Test
public void testBaseClassSerializerInvokedForBaseClassFields() {
Gson gson = new GsonBuilder()
.registerTypeAdapter(Base.class, new BaseSerializer())
.registerTypeAdapter(Sub.class, new SubSerializer())
.create();
ClassWithBaseField target = new ClassWithBaseField(new Base());
JsonObject json = (JsonObject) gson.toJsonTree(target);
JsonObject base = json.get("base").getAsJsonObject();
assertEquals(BaseSerializer.NAME, base.get(Base.SERIALIZER_KEY).getAsString());
}
@Test
public void testSubClassSerializerInvokedForBaseClassFieldsHoldingSubClassInstances() {
Gson gson = new GsonBuilder()
.registerTypeAdapter(Base.class, new BaseSerializer())
.registerTypeAdapter(Sub.class, new SubSerializer())
.create();
ClassWithBaseField target = new ClassWithBaseField(new Sub());
JsonObject json = (JsonObject) gson.toJsonTree(target);
JsonObject base = json.get("base").getAsJsonObject();
assertEquals(SubSerializer.NAME, base.get(Base.SERIALIZER_KEY).getAsString());
}
@Test
public void testSubClassSerializerInvokedForBaseClassFieldsHoldingArrayOfSubClassInstances() {
Gson gson = new GsonBuilder()
.registerTypeAdapter(Base.class, new BaseSerializer())
.registerTypeAdapter(Sub.class, new SubSerializer())
.create();
ClassWithBaseArrayField target = new ClassWithBaseArrayField(new Base[] {new Sub(), new Sub()});
JsonObject json = (JsonObject) gson.toJsonTree(target);
JsonArray array = json.get("base").getAsJsonArray();
for (JsonElement element : array) {
JsonElement serializerKey = element.getAsJsonObject().get(Base.SERIALIZER_KEY);
assertEquals(SubSerializer.NAME, serializerKey.getAsString());
}
}
@Test
public void testBaseClassSerializerInvokedForBaseClassFieldsHoldingSubClassInstances() {
Gson gson = new GsonBuilder()
.registerTypeAdapter(Base.class, new BaseSerializer())
.create();
ClassWithBaseField target = new ClassWithBaseField(new Sub());
JsonObject json = (JsonObject) gson.toJsonTree(target);
JsonObject base = json.get("base").getAsJsonObject();
assertEquals(BaseSerializer.NAME, base.get(Base.SERIALIZER_KEY).getAsString());
}
@Test
public void testSerializerReturnsNull() {
Gson gson = new GsonBuilder()
.registerTypeAdapter(Base.class, new JsonSerializer<Base>() {
@Override public JsonElement serialize(Base src, Type typeOfSrc, JsonSerializationContext context) {
return null;
}
})
.create();
JsonElement json = gson.toJsonTree(new Base());
assertTrue(json.isJsonNull());
}
}
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