| /* |
| * 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 java.lang.reflect.Type; |
| import java.math.BigInteger; |
| import java.util.concurrent.atomic.AtomicInteger; |
| import java.util.concurrent.atomic.AtomicLong; |
| import junit.framework.TestCase; |
| |
| /** |
| * Contains numerous tests involving registered type converters with a Gson instance. |
| * |
| * @author Inderjeet Singh |
| * @author Joel Leitch |
| */ |
| public class GsonTypeAdapterTest extends TestCase { |
| private Gson gson; |
| |
| @Override |
| protected void setUp() throws Exception { |
| super.setUp(); |
| gson = new GsonBuilder() |
| .registerTypeAdapter(AtomicLong.class, new ExceptionTypeAdapter()) |
| .registerTypeAdapter(AtomicInteger.class, new AtomicIntegerTypeAdapter()) |
| .create(); |
| } |
| |
| public void testDefaultTypeAdapterThrowsParseException() throws Exception { |
| try { |
| gson.fromJson("{\"abc\":123}", BigInteger.class); |
| fail("Should have thrown a JsonParseException"); |
| } catch (JsonParseException expected) { } |
| } |
| |
| public void testTypeAdapterThrowsException() throws Exception { |
| try { |
| gson.toJson(new AtomicLong(0)); |
| fail("Type Adapter should have thrown an exception"); |
| } catch (IllegalStateException expected) { } |
| |
| try { |
| gson.fromJson("123", AtomicLong.class); |
| fail("Type Adapter should have thrown an exception"); |
| } catch (JsonParseException expected) { } |
| } |
| |
| 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()); |
| } |
| |
| 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 |
| 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>() { |
| 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)); |
| } |
| } |