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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.segment;

import org.apache.druid.collections.bitmap.ImmutableBitmap;
import org.apache.druid.collections.spatial.ImmutableRTree;
import org.apache.druid.java.util.common.io.smoosh.SmooshedFileMapper;
import org.apache.druid.segment.data.CompressedColumnarLongsSupplier;
import org.apache.druid.segment.data.GenericIndexed;
import org.apache.druid.segment.data.VSizeColumnarMultiInts;
import org.joda.time.Interval;

import javax.annotation.Nullable;

import java.nio.ByteBuffer;
import java.util.Map;

/**
 */
public class MMappedIndex
{

  final GenericIndexed availableDimensions;
  final GenericIndexed availableMetrics;
  final Interval dataInterval;
  final CompressedColumnarLongsSupplier timestamps;
  final Map metrics;
  final Map> dimValueUtf8Lookups;
  final Map dimColumns;
  final Map> invertedIndexes;
  final Map spatialIndexes;
  final SmooshedFileMapper fileMapper;

  public MMappedIndex(
      GenericIndexed availableDimensions,
      GenericIndexed availableMetrics,
      Interval dataInterval,
      CompressedColumnarLongsSupplier timestamps,
      Map metrics,
      Map> dimValueUtf8Lookups,
      Map dimColumns,
      Map> invertedIndexes,
      Map spatialIndexes,
      SmooshedFileMapper fileMapper
  )
  {
    this.availableDimensions = availableDimensions;
    this.availableMetrics = availableMetrics;
    this.dataInterval = dataInterval;
    this.timestamps = timestamps;
    this.metrics = metrics;
    this.dimValueUtf8Lookups = dimValueUtf8Lookups;
    this.dimColumns = dimColumns;
    this.invertedIndexes = invertedIndexes;
    this.spatialIndexes = spatialIndexes;
    this.fileMapper = fileMapper;
  }

  public GenericIndexed getAvailableDimensions()
  {
    return availableDimensions;
  }

  public GenericIndexed getAvailableMetrics()
  {
    return availableMetrics;
  }

  public Interval getDataInterval()
  {
    return dataInterval;
  }

  @Nullable
  public MetricHolder getMetricHolder(String metric)
  {
    return metrics.get(metric);
  }

  public GenericIndexed getDimValueUtf8Lookup(String dimension)
  {
    return dimValueUtf8Lookups.get(dimension);
  }

  public VSizeColumnarMultiInts getDimColumn(String dimension)
  {
    return dimColumns.get(dimension);
  }

  public Map> getBitmapIndexes()
  {
    return invertedIndexes;
  }

  public Map getSpatialIndexes()
  {
    return spatialIndexes;
  }

  public SmooshedFileMapper getFileMapper()
  {
    return fileMapper;
  }

}