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/*
* Copyright (C) 2008 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;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.fail;
import java.lang.reflect.Type;
import java.math.BigInteger;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;
import org.junit.Before;
import org.junit.Test;
/**
* Contains numerous tests involving registered type converters with a Gson instance.
*
* @author Inderjeet Singh
* @author Joel Leitch
*/
public class GsonTypeAdapterTest {
private Gson gson;
@Before
public void setUp() throws Exception {
gson = new GsonBuilder()
.registerTypeAdapter(AtomicLong.class, new ExceptionTypeAdapter())
.registerTypeAdapter(AtomicInteger.class, new AtomicIntegerTypeAdapter())
.create();
}
@Test
public void testDefaultTypeAdapterThrowsParseException() throws Exception {
try {
gson.fromJson("{\"abc\":123}", BigInteger.class);
fail("Should have thrown a JsonParseException");
} catch (JsonParseException expected) { }
}
@Test
public void testTypeAdapterThrowsException() throws Exception {
try {
gson.toJson(new AtomicLong(0));
fail("Type Adapter should have thrown an exception");
} catch (IllegalStateException expected) { }
// Verify that serializer is made null-safe, i.e. it is not called for null
assertEquals("null", gson.toJson(null, AtomicLong.class));
try {
gson.fromJson("123", AtomicLong.class);
fail("Type Adapter should have thrown an exception");
} catch (JsonParseException expected) { }
// Verify that deserializer is made null-safe, i.e. it is not called for null
assertNull(gson.fromJson(JsonNull.INSTANCE, AtomicLong.class));
}
@Test
public void testTypeAdapterProperlyConvertsTypes() throws Exception {
int intialValue = 1;
AtomicInteger atomicInt = new AtomicInteger(intialValue);
String json = gson.toJson(atomicInt);
assertEquals(intialValue + 1, Integer.parseInt(json));
atomicInt = gson.fromJson(json, AtomicInteger.class);
assertEquals(intialValue, atomicInt.get());
}
@Test
public void testTypeAdapterDoesNotAffectNonAdaptedTypes() throws Exception {
String expected = "blah";
String actual = gson.toJson(expected);
assertEquals("\"" + expected + "\"", actual);
actual = gson.fromJson(actual, String.class);
assertEquals(expected, actual);
}
private static class ExceptionTypeAdapter
implements JsonSerializer<AtomicLong>, JsonDeserializer<AtomicLong> {
@Override public JsonElement serialize(
AtomicLong src, Type typeOfSrc, JsonSerializationContext context) {
throw new IllegalStateException();
}
@Override public AtomicLong deserialize(
JsonElement json, Type typeOfT, JsonDeserializationContext context)
throws JsonParseException {
throw new IllegalStateException();
}
}
private static class AtomicIntegerTypeAdapter
implements JsonSerializer<AtomicInteger>, JsonDeserializer<AtomicInteger> {
@Override public JsonElement serialize(AtomicInteger src, Type typeOfSrc, JsonSerializationContext context) {
return new JsonPrimitive(src.incrementAndGet());
}
@Override public AtomicInteger deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
throws JsonParseException {
int intValue = json.getAsInt();
return new AtomicInteger(--intValue);
}
}
static abstract class Abstract {
String a;
}
static class Concrete extends Abstract {
String b;
}
// https://groups.google.com/d/topic/google-gson/EBmOCa8kJPE/discussion
@Test
public void testDeserializerForAbstractClass() {
Concrete instance = new Concrete();
instance.a = "android";
instance.b = "beep";
assertSerialized("{\"a\":\"android\"}", Abstract.class, true, true, instance);
assertSerialized("{\"a\":\"android\"}", Abstract.class, true, false, instance);
assertSerialized("{\"a\":\"android\"}", Abstract.class, false, true, instance);
assertSerialized("{\"a\":\"android\"}", Abstract.class, false, false, instance);
assertSerialized("{\"b\":\"beep\",\"a\":\"android\"}", Concrete.class, true, true, instance);
assertSerialized("{\"b\":\"beep\",\"a\":\"android\"}", Concrete.class, true, false, instance);
assertSerialized("{\"b\":\"beep\",\"a\":\"android\"}", Concrete.class, false, true, instance);
assertSerialized("{\"b\":\"beep\",\"a\":\"android\"}", Concrete.class, false, false, instance);
}
private void assertSerialized(String expected, Class<?> instanceType, boolean registerAbstractDeserializer,
boolean registerAbstractHierarchyDeserializer, Object instance) {
JsonDeserializer<Abstract> deserializer = new JsonDeserializer<Abstract>() {
@Override public Abstract deserialize(JsonElement json, Type typeOfT,
JsonDeserializationContext context) throws JsonParseException {
throw new AssertionError();
}
};
GsonBuilder builder = new GsonBuilder();
if (registerAbstractDeserializer) {
builder.registerTypeAdapter(Abstract.class, deserializer);
}
if (registerAbstractHierarchyDeserializer) {
builder.registerTypeHierarchyAdapter(Abstract.class, deserializer);
}
Gson gson = builder.create();
assertEquals(expected, gson.toJson(instance, instanceType));
}
}
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