001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.util;
019
020import java.io.IOException;
021import java.util.concurrent.atomic.LongAdder;
022import org.apache.yetus.audience.InterfaceAudience;
023
024import org.apache.hbase.thirdparty.com.google.gson.GsonBuilder;
025import org.apache.hbase.thirdparty.com.google.gson.LongSerializationPolicy;
026import org.apache.hbase.thirdparty.com.google.gson.TypeAdapter;
027import org.apache.hbase.thirdparty.com.google.gson.stream.JsonReader;
028import org.apache.hbase.thirdparty.com.google.gson.stream.JsonWriter;
029
030/**
031 * Helper class for gson.
032 */
033@InterfaceAudience.Private
034public final class GsonUtil {
035
036  private GsonUtil() {
037  }
038
039  /**
040   * Create a builder which is used to create a Gson instance.
041   * <p/>
042   * Will set some common configs for the builder.
043   */
044  public static GsonBuilder createGson() {
045    return new GsonBuilder().setLongSerializationPolicy(LongSerializationPolicy.STRING)
046      .registerTypeAdapter(LongAdder.class, new TypeAdapter<LongAdder>() {
047
048        @Override
049        public void write(JsonWriter out, LongAdder value) throws IOException {
050          out.value(value.longValue());
051        }
052
053        @Override
054        public LongAdder read(JsonReader in) throws IOException {
055          LongAdder value = new LongAdder();
056          value.add(in.nextLong());
057          return value;
058        }
059      });
060  }
061}