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/*
* Copyright (C) 2012 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.io.IOException;
import java.util.ArrayList;
import java.util.List;
import junit.framework.TestCase;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.TypeAdapter;
import com.google.gson.TypeAdapterFactory;
import com.google.gson.common.TestTypes.BagOfPrimitives;
import com.google.gson.reflect.TypeToken;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonWriter;
/**
* Functional tests for {@link Gson#getDelegateAdapter(TypeAdapterFactory, TypeToken)} method.
*
* @author Inderjeet Singh
*/
public class DelegateTypeAdapterTest extends TestCase {
private StatsTypeAdapterFactory stats;
private Gson gson;
@Override
protected void setUp() throws Exception {
super.setUp();
stats = new StatsTypeAdapterFactory();
gson = new GsonBuilder()
.registerTypeAdapterFactory(stats)
.create();
}
public void testDelegateInvoked() {
List<BagOfPrimitives> bags = new ArrayList<>();
for (int i = 0; i < 10; ++i) {
bags.add(new BagOfPrimitives(i, i, i % 2 == 0, String.valueOf(i)));
}
String json = gson.toJson(bags);
bags = gson.fromJson(json, new TypeToken<List<BagOfPrimitives>>(){}.getType());
// 11: 1 list object, and 10 entries. stats invoked on all 5 fields
assertEquals(51, stats.numReads);
assertEquals(51, stats.numWrites);
}
public void testDelegateInvokedOnStrings() {
String[] bags = {"1", "2", "3", "4"};
String json = gson.toJson(bags);
bags = gson.fromJson(json, String[].class);
// 1 array object with 4 elements.
assertEquals(5, stats.numReads);
assertEquals(5, stats.numWrites);
}
private static class StatsTypeAdapterFactory implements TypeAdapterFactory {
public int numReads = 0;
public int numWrites = 0;
@Override public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) {
final TypeAdapter<T> delegate = gson.getDelegateAdapter(this, type);
return new TypeAdapter<T>() {
@Override
public void write(JsonWriter out, T value) throws IOException {
++numWrites;
delegate.write(out, value);
}
@Override
public T read(JsonReader in) throws IOException {
++numReads;
return delegate.read(in);
}
};
}
}
}
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