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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.ByteBuffer;
import java.util.Comparator;

public interface ObjectStrategy extends Comparator
{
  public Class getClazz();

  /**
   * Convert values from their underlying byte representation.
   *
   * Implementations of this method must not change the given buffer mark, or limit, but may modify its position.
   * Use buffer.asReadOnlyBuffer() or buffer.duplicate() if mark or limit need to be set.
   *
   * @param buffer buffer to read value from
   * @param numBytes number of bytes used to store the value, starting at buffer.position()
   * @return an object created from the given byte buffer representation
   */
  public T fromByteBuffer(ByteBuffer buffer, int numBytes);
  public byte[] toBytes(T val);
}