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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.topn;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.metamx.common.guava.Comparators;
import io.druid.query.aggregation.AggregatorFactory;
import io.druid.query.aggregation.PostAggregator;
import io.druid.query.dimension.DimensionSpec;
import org.joda.time.DateTime;

import java.nio.ByteBuffer;
import java.util.Comparator;
import java.util.List;

/**
 */
public class InvertedTopNMetricSpec implements TopNMetricSpec
{
  private static final byte CACHE_TYPE_ID = 0x3;
  private final TopNMetricSpec delegate;

  @JsonCreator
  public InvertedTopNMetricSpec(
      @JsonProperty("metric") TopNMetricSpec delegate
  )
  {
    this.delegate = delegate;
  }

  @Override
  public void verifyPreconditions(
      List aggregatorSpecs,
      List postAggregatorSpecs
  )
  {
    delegate.verifyPreconditions(aggregatorSpecs, postAggregatorSpecs);
  }

  @JsonProperty("metric")
  public TopNMetricSpec getDelegate()
  {
    return delegate;
  }

  @Override
  public Comparator getComparator(
      final List aggregatorSpecs,
      final List postAggregatorSpecs
  )
  {
    return Comparators.inverse(
        new Comparator()
        {
          @Override
          public int compare(Object o1, Object o2)
          {
            // nulls last
            if (o1 == null) {
              return 1;
            }
            if (o2 == null) {
              return -1;
            }
            return delegate.getComparator(aggregatorSpecs, postAggregatorSpecs).compare(o1, o2);
          }
        }
    );
  }

  @Override
  public TopNResultBuilder getResultBuilder(
      DateTime timestamp,
      DimensionSpec dimSpec,
      int threshold,
      Comparator comparator,
      List aggFactories,
      List postAggs
  )
  {
    return delegate.getResultBuilder(
        timestamp,
        dimSpec,
        threshold,
        comparator,
        aggFactories,
        postAggs
    );
  }

  @Override
  public byte[] getCacheKey()
  {
    final byte[] cacheKey = delegate.getCacheKey();

    return ByteBuffer.allocate(1 + cacheKey.length).put(CACHE_TYPE_ID).put(cacheKey).array();
  }

  @Override
  public  TopNMetricSpecBuilder configureOptimizer(TopNMetricSpecBuilder builder)
  {
    if (!canBeOptimizedUnordered()) {
      return builder;
    }
    return delegate.configureOptimizer(builder);
  }

  @Override
  public void initTopNAlgorithmSelector(TopNAlgorithmSelector selector)
  {
    delegate.initTopNAlgorithmSelector(selector);
  }

  @Override
  public String getMetricName(DimensionSpec dimSpec)
  {
    return delegate.getMetricName(dimSpec);
  }

  @Override
  public boolean canBeOptimizedUnordered()
  {
    return delegate.canBeOptimizedUnordered();
  }

  @Override
  public boolean equals(Object o)
  {
    if (this == o) {
      return true;
    }
    if (o == null || getClass() != o.getClass()) {
      return false;
    }

    InvertedTopNMetricSpec that = (InvertedTopNMetricSpec) o;

    if (delegate != null ? !delegate.equals(that.delegate) : that.delegate != null) {
      return false;
    }

    return true;
  }

  @Override
  public int hashCode()
  {
    return delegate != null ? delegate.hashCode() : 0;
  }
}