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/**
 * 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.hadoop.hbase.util;

import java.io.IOException;

import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hbase.thirdparty.com.google.gson.GsonBuilder;
import org.apache.hbase.thirdparty.com.google.gson.LongSerializationPolicy;
import org.apache.hbase.thirdparty.com.google.gson.TypeAdapter;
import org.apache.hbase.thirdparty.com.google.gson.stream.JsonReader;
import org.apache.hbase.thirdparty.com.google.gson.stream.JsonWriter;

/**
 * Helper class for gson.
 */
@InterfaceAudience.Private
public final class GsonUtil {

  private GsonUtil() {
  }

  /**
   * Create a builder which is used to create a Gson instance.
   * 
   * Will set some common configs for the builder.
   */
  public static GsonBuilder createGson() {
    return new GsonBuilder().setLongSerializationPolicy(LongSerializationPolicy.STRING)
      .registerTypeAdapter(LongAdder.class, new TypeAdapter() {

        @Override
        public void write(JsonWriter out, LongAdder value) throws IOException {
          out.value(value.longValue());
        }

        @Override
        public LongAdder read(JsonReader in) throws IOException {
          LongAdder value = new LongAdder();
          value.add(in.nextLong());
          return value;
        }
      });
  }
}