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