GsonTest.java

/*
 * Copyright (C) 2016 The Gson Authors
 *
 * 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 com.google.gson.internal.Excluder;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonWriter;
import java.io.IOException;
import java.lang.reflect.Field;
import java.lang.reflect.Type;
import java.text.DateFormat;
import java.util.ArrayList;
import java.util.HashMap;
import junit.framework.TestCase;

/**
 * Unit tests for {@link Gson}.
 *
 * @author Ryan Harter
 */
public final class GsonTest extends TestCase {

  private static final Excluder CUSTOM_EXCLUDER = Excluder.DEFAULT
      .excludeFieldsWithoutExposeAnnotation()
      .disableInnerClassSerialization();

  private static final FieldNamingStrategy CUSTOM_FIELD_NAMING_STRATEGY = new FieldNamingStrategy() {
    @Override public String translateName(Field f) {
      return "foo";
    }
  };

  private static final ToNumberStrategy CUSTOM_OBJECT_TO_NUMBER_STRATEGY = ToNumberPolicy.DOUBLE;
  private static final ToNumberStrategy CUSTOM_NUMBER_TO_NUMBER_STRATEGY = ToNumberPolicy.LAZILY_PARSED_NUMBER;

  public void testOverridesDefaultExcluder() {
    Gson gson = new Gson(CUSTOM_EXCLUDER, CUSTOM_FIELD_NAMING_STRATEGY,
        new HashMap<Type, InstanceCreator<?>>(), true, false, true, false,
        true, true, false, LongSerializationPolicy.DEFAULT, null, DateFormat.DEFAULT,
        DateFormat.DEFAULT, new ArrayList<TypeAdapterFactory>(),
        new ArrayList<TypeAdapterFactory>(), new ArrayList<TypeAdapterFactory>(),
        CUSTOM_OBJECT_TO_NUMBER_STRATEGY, CUSTOM_NUMBER_TO_NUMBER_STRATEGY);

    assertEquals(CUSTOM_EXCLUDER, gson.excluder);
    assertEquals(CUSTOM_FIELD_NAMING_STRATEGY, gson.fieldNamingStrategy());
    assertEquals(true, gson.serializeNulls());
    assertEquals(false, gson.htmlSafe());
  }

  public void testClonedTypeAdapterFactoryListsAreIndependent() {
    Gson original = new Gson(CUSTOM_EXCLUDER, CUSTOM_FIELD_NAMING_STRATEGY,
        new HashMap<Type, InstanceCreator<?>>(), true, false, true, false,
        true, true, false, LongSerializationPolicy.DEFAULT, null, DateFormat.DEFAULT,
        DateFormat.DEFAULT, new ArrayList<TypeAdapterFactory>(),
        new ArrayList<TypeAdapterFactory>(), new ArrayList<TypeAdapterFactory>(),
        CUSTOM_OBJECT_TO_NUMBER_STRATEGY, CUSTOM_NUMBER_TO_NUMBER_STRATEGY);

    Gson clone = original.newBuilder()
        .registerTypeAdapter(Object.class, new TestTypeAdapter())
        .create();

    assertEquals(original.factories.size() + 1, clone.factories.size());
  }

  private static final class TestTypeAdapter extends TypeAdapter<Object> {
    @Override public void write(JsonWriter out, Object value) throws IOException {
      // Test stub.
    }
    @Override public Object read(JsonReader in) throws IOException { return null; }
  }
}