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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 java.nio.Buffer;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;

public abstract class FixedSizeCompressedObjectStrategy extends CompressedObjectStrategy
{
  private final int sizePer;

  protected FixedSizeCompressedObjectStrategy(
      ByteOrder order,
      BufferConverter converter,
      CompressionStrategy compression,
      int sizePer
  )
  {
    super(order, converter, compression);
    this.sizePer = sizePer;
  }

  public int getSize() {
    return sizePer;
  }

  @Override
  protected ByteBuffer bufferFor(T val)
  {
    return ByteBuffer.allocate(converter.sizeOf(getSize())).order(order);
  }

  @Override
  protected void decompress(ByteBuffer buffer, int numBytes, ByteBuffer buf)
  {
    decompressor.decompress(buffer, numBytes, buf, converter.sizeOf(getSize()));
  }
}