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/*
* Copyright (C) 2011 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.typeadapters;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonParseException;
import com.google.gson.TypeAdapterFactory;
import junit.framework.TestCase;
public final class RuntimeTypeAdapterFactoryTest extends TestCase {
public void testRuntimeTypeAdapter() {
RuntimeTypeAdapterFactory<BillingInstrument> rta = RuntimeTypeAdapterFactory.of(
BillingInstrument.class)
.registerSubtype(CreditCard.class);
Gson gson = new GsonBuilder()
.registerTypeAdapterFactory(rta)
.create();
CreditCard original = new CreditCard("Jesse", 234);
assertEquals("{\"type\":\"CreditCard\",\"cvv\":234,\"ownerName\":\"Jesse\"}",
gson.toJson(original, BillingInstrument.class));
BillingInstrument deserialized = gson.fromJson(
"{type:'CreditCard',cvv:234,ownerName:'Jesse'}", BillingInstrument.class);
assertEquals("Jesse", deserialized.ownerName);
assertTrue(deserialized instanceof CreditCard);
}
public void testRuntimeTypeAdapterRecognizeSubtypes() {
// We don't have an explicit factory for CreditCard.class, but we do have one for
// BillingInstrument.class that has recognizeSubtypes(). So it should recognize CreditCard, and
// when we call gson.toJson(original) below, without an explicit type, it should be invoked.
RuntimeTypeAdapterFactory<BillingInstrument> rta = RuntimeTypeAdapterFactory.of(
BillingInstrument.class)
.recognizeSubtypes()
.registerSubtype(CreditCard.class);
Gson gson = new GsonBuilder()
.registerTypeAdapterFactory(rta)
.create();
CreditCard original = new CreditCard("Jesse", 234);
assertEquals("{\"type\":\"CreditCard\",\"cvv\":234,\"ownerName\":\"Jesse\"}",
gson.toJson(original));
BillingInstrument deserialized = gson.fromJson(
"{type:'CreditCard',cvv:234,ownerName:'Jesse'}", BillingInstrument.class);
assertEquals("Jesse", deserialized.ownerName);
assertTrue(deserialized instanceof CreditCard);
}
public void testRuntimeTypeIsBaseType() {
TypeAdapterFactory rta = RuntimeTypeAdapterFactory.of(
BillingInstrument.class)
.registerSubtype(BillingInstrument.class);
Gson gson = new GsonBuilder()
.registerTypeAdapterFactory(rta)
.create();
BillingInstrument original = new BillingInstrument("Jesse");
assertEquals("{\"type\":\"BillingInstrument\",\"ownerName\":\"Jesse\"}",
gson.toJson(original, BillingInstrument.class));
BillingInstrument deserialized = gson.fromJson(
"{type:'BillingInstrument',ownerName:'Jesse'}", BillingInstrument.class);
assertEquals("Jesse", deserialized.ownerName);
}
public void testNullBaseType() {
try {
RuntimeTypeAdapterFactory.of(null);
fail();
} catch (NullPointerException expected) {
}
}
public void testNullTypeFieldName() {
try {
RuntimeTypeAdapterFactory.of(BillingInstrument.class, null);
fail();
} catch (NullPointerException expected) {
}
}
public void testNullSubtype() {
RuntimeTypeAdapterFactory<BillingInstrument> rta = RuntimeTypeAdapterFactory.of(
BillingInstrument.class);
try {
rta.registerSubtype(null);
fail();
} catch (NullPointerException expected) {
}
}
public void testNullLabel() {
RuntimeTypeAdapterFactory<BillingInstrument> rta = RuntimeTypeAdapterFactory.of(
BillingInstrument.class);
try {
rta.registerSubtype(CreditCard.class, null);
fail();
} catch (NullPointerException expected) {
}
}
public void testDuplicateSubtype() {
RuntimeTypeAdapterFactory<BillingInstrument> rta = RuntimeTypeAdapterFactory.of(
BillingInstrument.class);
rta.registerSubtype(CreditCard.class, "CC");
try {
rta.registerSubtype(CreditCard.class, "Visa");
fail();
} catch (IllegalArgumentException expected) {
}
}
public void testDuplicateLabel() {
RuntimeTypeAdapterFactory<BillingInstrument> rta = RuntimeTypeAdapterFactory.of(
BillingInstrument.class);
rta.registerSubtype(CreditCard.class, "CC");
try {
rta.registerSubtype(BankTransfer.class, "CC");
fail();
} catch (IllegalArgumentException expected) {
}
}
public void testDeserializeMissingTypeField() {
TypeAdapterFactory billingAdapter = RuntimeTypeAdapterFactory.of(BillingInstrument.class)
.registerSubtype(CreditCard.class);
Gson gson = new GsonBuilder()
.registerTypeAdapterFactory(billingAdapter)
.create();
try {
gson.fromJson("{ownerName:'Jesse'}", BillingInstrument.class);
fail();
} catch (JsonParseException expected) {
}
}
public void testDeserializeMissingSubtype() {
TypeAdapterFactory billingAdapter = RuntimeTypeAdapterFactory.of(BillingInstrument.class)
.registerSubtype(BankTransfer.class);
Gson gson = new GsonBuilder()
.registerTypeAdapterFactory(billingAdapter)
.create();
try {
gson.fromJson("{type:'CreditCard',ownerName:'Jesse'}", BillingInstrument.class);
fail();
} catch (JsonParseException expected) {
}
}
public void testSerializeMissingSubtype() {
TypeAdapterFactory billingAdapter = RuntimeTypeAdapterFactory.of(BillingInstrument.class)
.registerSubtype(BankTransfer.class);
Gson gson = new GsonBuilder()
.registerTypeAdapterFactory(billingAdapter)
.create();
try {
gson.toJson(new CreditCard("Jesse", 456), BillingInstrument.class);
fail();
} catch (JsonParseException expected) {
}
}
public void testSerializeCollidingTypeFieldName() {
TypeAdapterFactory billingAdapter = RuntimeTypeAdapterFactory.of(BillingInstrument.class, "cvv")
.registerSubtype(CreditCard.class);
Gson gson = new GsonBuilder()
.registerTypeAdapterFactory(billingAdapter)
.create();
try {
gson.toJson(new CreditCard("Jesse", 456), BillingInstrument.class);
fail();
} catch (JsonParseException expected) {
}
}
public void testSerializeWrappedNullValue() {
TypeAdapterFactory billingAdapter = RuntimeTypeAdapterFactory.of(BillingInstrument.class)
.registerSubtype(CreditCard.class)
.registerSubtype(BankTransfer.class);
Gson gson = new GsonBuilder()
.registerTypeAdapterFactory(billingAdapter)
.create();
String serialized = gson.toJson(new BillingInstrumentWrapper(null), BillingInstrumentWrapper.class);
BillingInstrumentWrapper deserialized = gson.fromJson(serialized, BillingInstrumentWrapper.class);
assertNull(deserialized.instrument);
}
static class BillingInstrumentWrapper {
BillingInstrument instrument;
BillingInstrumentWrapper(BillingInstrument instrument) {
this.instrument = instrument;
}
}
static class BillingInstrument {
private final String ownerName;
BillingInstrument(String ownerName) {
this.ownerName = ownerName;
}
}
static class CreditCard extends BillingInstrument {
int cvv;
CreditCard(String ownerName, int cvv) {
super(ownerName);
this.cvv = cvv;
}
}
static class BankTransfer extends BillingInstrument {
int bankAccount;
BankTransfer(String ownerName, int bankAccount) {
super(ownerName);
this.bankAccount = bankAccount;
}
}
}
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