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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.Longs;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.LongBuffer;

/**
*/
public class CompressedLongBufferObjectStrategy extends FixedSizeCompressedObjectStrategy
{
  public static CompressedLongBufferObjectStrategy getBufferForOrder(final ByteOrder order, final CompressionStrategy compression, final int sizePer)
  {
    return new CompressedLongBufferObjectStrategy(order, compression, sizePer);
  }

  private CompressedLongBufferObjectStrategy(final ByteOrder order, final CompressionStrategy compression, final int sizePer)
  {
    super(
        order,
        new BufferConverter()
        {
          @Override
          public LongBuffer convert(ByteBuffer buf)
          {
            return buf.asLongBuffer();
          }

          @Override
          public int compare(LongBuffer lhs, LongBuffer rhs)
          {
            return Ordering.natural().nullsFirst().compare(lhs, rhs);
          }

          @Override
          public int sizeOf(int count)
          {
            return count * Longs.BYTES;
          }

          @Override
          public LongBuffer combine(ByteBuffer into, LongBuffer from)
          {
            return into.asLongBuffer().put(from);
          }
        },
        compression,
        sizePer
    );
  }
}