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A module that is everything required to understands Druid Segments

There is a newer version: 0.12.3

/*
 * Licensed to Metamarkets Group Inc. (Metamarkets) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Metamarkets 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 io.druid.query.aggregation;

import io.druid.segment.FloatColumnSelector;

import java.nio.ByteBuffer;

/**
 */
public class DoubleMinBufferAggregator implements BufferAggregator
{
  private final FloatColumnSelector selector;

  public DoubleMinBufferAggregator(FloatColumnSelector selector)
  {
    this.selector = selector;
  }

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

  @Override
  public void aggregate(ByteBuffer buf, int position)
  {
    buf.putDouble(position, Math.min(buf.getDouble(position), (double) selector.get()));
  }

  @Override
  public Object get(ByteBuffer buf, int position)
  {
    return buf.getDouble(position);
  }

  @Override
  public float getFloat(ByteBuffer buf, int position)
  {
    return (float) buf.getDouble(position);
  }


  @Override
  public long getLong(ByteBuffer buf, int position)
  {
    return  (long) buf.getDouble(position);
  }

  @Override
  public void close()
  {
    // no resources to cleanup
  }
}