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A module that is everything required to understands Druid Segments

There is a newer version: 31.0.0

/*
 * 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.druid.query.aggregation;

import org.apache.druid.segment.BaseDoubleColumnValueSelector;

import java.nio.ByteBuffer;

/**
 */
public class DoubleSumBufferAggregator extends SimpleDoubleBufferAggregator
{

  DoubleSumBufferAggregator(BaseDoubleColumnValueSelector selector)
  {
    super(selector);
  }

  @Override
  public void init(ByteBuffer buf, int position)
  {
    buf.putDouble(position, 0.0d);
  }

  @Override
  public void putFirst(ByteBuffer buf, int position, double value)
  {
    buf.putDouble(position, value);
  }

  @Override
  public void aggregate(ByteBuffer buf, int position, double value)
  {
    buf.putDouble(position, buf.getDouble(position) + value);
  }
}