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ImmutableMapTypeAdapterFactory.java
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ImmutableMapTypeAdapterFactory.java
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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.caliper.json;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Maps;
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.HashMap;
import java.util.Map;
import javax.inject.Inject;
/**
* Serializes and deserializes {@link ImmutableMap} instances using a {@link HashMap} as an
* intermediary.
*/
final class ImmutableMapTypeAdapterFactory implements TypeAdapterFactory {
@Inject
ImmutableMapTypeAdapterFactory() {}
@SuppressWarnings("unchecked")
@Override
public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> typeToken) {
Type type = typeToken.getType();
if (typeToken.getRawType() != ImmutableMap.class || !(type instanceof ParameterizedType)) {
return null;
}
com.google.common.reflect.TypeToken<ImmutableMap<?, ?>> betterToken =
(com.google.common.reflect.TypeToken<ImmutableMap<?, ?>>)
com.google.common.reflect.TypeToken.of(typeToken.getType());
final TypeAdapter<HashMap<?, ?>> hashMapAdapter =
(TypeAdapter<HashMap<?, ?>>)
gson.getAdapter(
TypeToken.get(
betterToken.getSupertype(Map.class).getSubtype(HashMap.class).getType()));
return new TypeAdapter<T>() {
@Override
public void write(JsonWriter out, T value) throws IOException {
HashMap<?, ?> hashMap = Maps.newHashMap((Map<?, ?>) value);
hashMapAdapter.write(out, hashMap);
}
@Override
public T read(JsonReader in) throws IOException {
HashMap<?, ?> hashMap = hashMapAdapter.read(in);
return (T) ImmutableMap.copyOf(hashMap);
}
};
}
}