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// Copyright (C) 2017 The Android Open Source Project
//
// 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.googlesource.gerrit.plugins.analytics.common
import java.io.PrintWriter
import java.lang.reflect.Type
import com.google.gerrit.json.OutputFormat
import com.google.gson.{Gson, GsonBuilder, JsonSerializer, _}
import com.google.inject.Singleton
@Singleton
class GsonFormatter {
val gsonBuilder: GsonBuilder =
OutputFormat.JSON_COMPACT.newGsonBuilder
.registerTypeHierarchyAdapter(classOf[Iterable[Any]], new IterableSerializer)
.registerTypeHierarchyAdapter(classOf[Option[Any]], new OptionSerializer())
def format[T](values: TraversableOnce[T], out: PrintWriter) {
val gson: Gson = gsonBuilder.create
for (value <- values) {
gson.toJson(value, out)
out.println()
}
}
class IterableSerializer extends JsonSerializer[Iterable[Any]] {
override def serialize(src: Iterable[Any], typeOfSrc: Type, context: JsonSerializationContext): JsonElement = {
import scala.collection.JavaConverters._
context.serialize(src.asJava)
}
}
class OptionSerializer extends JsonSerializer[Option[Any]] {
def serialize(src: Option[Any], typeOfSrc: Type, context: JsonSerializationContext): JsonElement = {
src match {
case None => JsonNull.INSTANCE
case Some(v) => context.serialize(v)
}
}
}
}