/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.twill.internal.json;
import com.google.common.collect.ImmutableMultimap;
import com.google.common.io.InputSupplier;
import com.google.common.io.OutputSupplier;
import com.google.common.reflect.TypeToken;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParseException;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;
import org.apache.twill.internal.Arguments;
import java.io.IOException;
import java.io.Reader;
import java.io.Writer;
import java.lang.reflect.Type;
import java.util.Collection;
import java.util.List;
import java.util.Map;
/**
* Gson codec for {@link Arguments}.
*/
public final class ArgumentsCodec implements JsonSerializer<Arguments>, JsonDeserializer<Arguments> {
private static final Gson GSON = new GsonBuilder().registerTypeAdapter(Arguments.class, new ArgumentsCodec())
.create();
public static void encode(Arguments arguments, OutputSupplier<? extends Writer> writerSupplier) throws IOException {
Writer writer = writerSupplier.getOutput();
try {
GSON.toJson(arguments, writer);
} finally {
writer.close();
}
}
public static Arguments decode(InputSupplier<? extends Reader> readerSupplier) throws IOException {
Reader reader = readerSupplier.getInput();
try {
return GSON.fromJson(reader, Arguments.class);
} finally {
reader.close();
}
}
@Override
public JsonElement serialize(Arguments src, Type typeOfSrc,
JsonSerializationContext context) {
JsonObject json = new JsonObject();
json.add("arguments", context.serialize(src.getArguments()));
json.add("runnableArguments", context.serialize(src.getRunnableArguments().asMap()));
return json;
}
@Override
public Arguments deserialize(JsonElement json, Type typeOfT,
JsonDeserializationContext context) throws JsonParseException {
JsonObject jsonObj = json.getAsJsonObject();
List<String> arguments = context.deserialize(jsonObj.get("arguments"), new TypeToken<List<String>>() { }.getType());
Map<String, Collection<String>> args = context.deserialize(jsonObj.get("runnableArguments"),
new TypeToken<Map<String, Collection<String>>>() {
}.getType());
ImmutableMultimap.Builder<String, String> builder = ImmutableMultimap.builder();
for (Map.Entry<String, Collection<String>> entry : args.entrySet()) {
builder.putAll(entry.getKey(), entry.getValue());
}
return new Arguments(arguments, builder.build());
}
}