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