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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.segment.data;

import com.google.common.collect.Ordering;
import com.google.common.primitives.Ints;
import io.druid.collections.IntList;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.IntBuffer;
import java.util.Iterator;

/**
 */
public class IntBufferIndexedInts implements IndexedInts, Comparable
{
  public static ObjectStrategy objectStrategy =
      new IntBufferIndexedIntsObjectStrategy();

  public static IntBufferIndexedInts fromArray(int[] array)
  {
    final ByteBuffer buffer = ByteBuffer.allocate(array.length * Ints.BYTES);
    buffer.asIntBuffer().put(array);

    return new IntBufferIndexedInts(buffer.asReadOnlyBuffer());
  }

  public static IntBufferIndexedInts fromIntList(IntList intList)
  {
    final ByteBuffer buffer = ByteBuffer.allocate(intList.length() * Ints.BYTES);
    final IntBuffer intBuf = buffer.asIntBuffer();

    for (int i = 0; i < intList.length(); ++i) {
      intBuf.put(intList.get(i));
    }

    return new IntBufferIndexedInts(buffer.asReadOnlyBuffer());
  }

  private final ByteBuffer buffer;

  public IntBufferIndexedInts(ByteBuffer buffer)
  {
    this.buffer = buffer;
  }

  @Override
  public int size()
  {
    return buffer.remaining() / 4;
  }

  @Override
  public int get(int index)
  {
    return buffer.getInt(buffer.position() + (index * 4));
  }

  public ByteBuffer getBuffer()
  {
    return buffer.asReadOnlyBuffer();
  }

  @Override
  public int compareTo(IntBufferIndexedInts o)
  {
    return buffer.compareTo(o.getBuffer());
  }

  @Override
  public Iterator iterator()
  {
    return new IndexedIntsIterator(this);
  }

  private static class IntBufferIndexedIntsObjectStrategy implements ObjectStrategy
  {
    @Override
    public Class getClazz()
    {
      return IntBufferIndexedInts.class;
    }

    @Override
    public IntBufferIndexedInts fromByteBuffer(ByteBuffer buffer, int numBytes)
    {
      final ByteBuffer readOnlyBuffer = buffer.asReadOnlyBuffer();
      readOnlyBuffer.limit(readOnlyBuffer.position() + numBytes);
      return new IntBufferIndexedInts(readOnlyBuffer);
    }

    @Override
    public byte[] toBytes(IntBufferIndexedInts val)
    {
      ByteBuffer buffer = val.getBuffer();
      byte[] bytes = new byte[buffer.remaining()];
      buffer.get(bytes);

      return bytes;
    }

    @Override
    public int compare(IntBufferIndexedInts o1, IntBufferIndexedInts o2)
    {
      return Ordering.natural().nullsFirst().compare(o1, o2);
    }
  }

  @Override
  public void fill(int index, int[] toFill)
  {
    throw new UnsupportedOperationException("fill not supported");
  }

  @Override
  public void close() throws IOException
  {

  }
}