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Java example source code file (RuntimeTypeAdapterFactoryTest.java)

This example Java source code file (RuntimeTypeAdapterFactoryTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

banktransfer, billinginstrument, billinginstrumentwrapper, creditcard, gsonbuilder, illegalargumentexception, jesse, jsonparseexception, nullpointerexception, runtimetypeadapterfactory, runtimetypeadapterfactorytest, string, typeadapterfactory

The RuntimeTypeAdapterFactoryTest.java Java example source code

/*
 * 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 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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