| /* |
| * 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.caliper.json; |
| |
| import com.google.common.collect.ImmutableList; |
| import com.google.common.collect.Lists; |
| import com.google.gson.Gson; |
| import com.google.gson.TypeAdapter; |
| import com.google.gson.TypeAdapterFactory; |
| import com.google.gson.reflect.TypeToken; |
| import com.google.gson.stream.JsonReader; |
| import com.google.gson.stream.JsonWriter; |
| |
| import java.io.IOException; |
| import java.lang.reflect.ParameterizedType; |
| import java.lang.reflect.Type; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * Serializes and deserializes {@link ImmutableList} instances using an {@link ArrayList} as an |
| * intermediary. |
| */ |
| final class ImmutableListTypeAdatperFactory implements TypeAdapterFactory { |
| @SuppressWarnings("unchecked") |
| @Override public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> typeToken) { |
| Type type = typeToken.getType(); |
| if (typeToken.getRawType() != ImmutableList.class |
| || !(type instanceof ParameterizedType)) { |
| return null; |
| } |
| |
| com.google.common.reflect.TypeToken<ImmutableList<?>> betterToken = |
| (com.google.common.reflect.TypeToken<ImmutableList<?>>) |
| com.google.common.reflect.TypeToken.of(typeToken.getType()); |
| final TypeAdapter<ArrayList<?>> arrayListAdapter = |
| (TypeAdapter<ArrayList<?>>) gson.getAdapter( |
| TypeToken.get(betterToken.getSupertype(List.class).getSubtype(ArrayList.class) |
| .getType())); |
| return new TypeAdapter<T>() { |
| @Override public void write(JsonWriter out, T value) throws IOException { |
| ArrayList<?> arrayList = Lists.newArrayList((List<?>) value); |
| arrayListAdapter.write(out, arrayList); |
| } |
| |
| @Override public T read(JsonReader in) throws IOException { |
| ArrayList<?> arrayList = arrayListAdapter.read(in); |
| return (T) ImmutableList.copyOf(arrayList); |
| } |
| }; |
| } |
| } |