/*
 * Copyright (C) 2009 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.functional;

import java.lang.reflect.Type;

import junit.framework.TestCase;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.InstanceCreator;
import com.google.gson.common.TestTypes.Base;
import com.google.gson.common.TestTypes.ClassWithBaseField;
import com.google.gson.common.TestTypes.Sub;

/**
 * Functional Test exercising custom serialization only.  When test applies to both 
 * serialization and deserialization then add it to CustomTypeAdapterTest.
 *
 * @author Inderjeet Singh
 */
public class InstanceCreatorTest extends TestCase {
  
  public void testInstanceCreatorReturnsBaseType() {
    Gson gson = new GsonBuilder()
      .registerTypeAdapter(Base.class, new InstanceCreator<Base>() {
       public Base createInstance(Type type) {
         return new Base();
       }
      })
      .create();
    String json = "{baseName:'BaseRevised',subName:'Sub'}";
    Base base = gson.fromJson(json, Base.class);
    assertEquals("BaseRevised", base.baseName);
  }
  
  public void testInstanceCreatorReturnsSubTypeForTopLevelObject() {
    Gson gson = new GsonBuilder()
    .registerTypeAdapter(Base.class, new InstanceCreator<Base>() {
      public Base createInstance(Type type) {
        return new Sub();
      }
    })
    .create();
    String json = "{baseName:'Base',subName:'SubRevised'}";
    Base base = gson.fromJson(json, Base.class);
    assertFalse("SubRevised".equals(((Sub)base).subName));
  }
  
  public void testInstanceCreatorReturnsSubTypeForField() {
    Gson gson = new GsonBuilder()
    .registerTypeAdapter(Base.class, new InstanceCreator<Base>() {
      public Base createInstance(Type type) {
        return new Sub();
      }
    })
    .create();
    String json = "{base:{baseName:'Base',subName:'SubRevised'}}";
    ClassWithBaseField target = gson.fromJson(json, ClassWithBaseField.class);
    assertTrue(target.base instanceof Sub);
    assertEquals("SubRevised", ((Sub)target.base).subName);
  }
}